Thank you for this video ive never work on a bike before I watched this video.i bought a 2005 KX250f and after this video I went to my garage and did what you did and now my bike runs good.thanks. keep up with the videos
The valves get tight over time as they wear into the head. If you have no clearance, and verified you are at TDC, you'll have to install a thinner shim and repeat the process. At a min, put in a shim that gives you max spec clearance, and you may find yourself in spec.
Hi Matthew I just wanted to ask. What are some good mods or absolute must haves for this engine type (04-05 kxf, 04-06 rmz) for this motor to run reliable ? I've got one I've done a new lower end on and want it to last me as long as I can and not have it lock up on me when I'm trail riding near a cliff.. thank you!!
This video is very good. The only thing I wish you included was links to buy all of the parts and supplies I need to do this, I just picked up an 07 KX250F and it’s quite difficult to start, has a ticking in the top end when started even know the top end and valves were replaced, and also will not idle without choke so I’ll be rebuilding the carb too. I need the torque wrench, hondabond, and whatever else you used.
Great video! However, it should be pointed out that 28 pins on the chain should be in between the 9 o’clock exhaust mark and the 3 o’clock intake mark.
Good job. After changing out the shims there is no need to reassemble the caps and chain to check the clearance. You can simply lay the cam in place and check the new clearance. The cams are not under any load at TDC so it's easy and if there is any further adjustment required you don't need to pull it all apart again. Just lift the cam and change the shim and once it all measures up right go ahead and button it all back up 😀
@@HTMR And you did. My comment was for those watching your video, with little or no real experience. Your step by step instructional videos are second to none
Muy buen video, el idioma no lo he entendido nada jejejejeje , pero como dice el dicho....... una imagen, vale mas que mil palabras. Gracias por el video...
thanks for this super video! i just did my 09 KX250F, following step by step: got it all up-and-running again (I did have one Intake valve with NO tolerance; it had difficult cold starts since a coupe of weeks). I was able to 'return' the chain tensioner without removing it (yes: did remove the spring); with 2 screwdrivers: you can slowly close it from the top... thanks!!!
I have a 2009 250f and with hot cams the intake will not allow the engine to make a full revolution stock cams it’s fin but the marks on the intake cam have the lobes facing more towards the head but the engine will spin without contacting anything.
This video is spot on. Thank you so much for the help! One question though, why did you go a bit over the exhaust valves but well within the intake valves? I need to order shims but I was curious when doing the math for what I need. Thanks
I'll probably get assaulted in the comments but have you ever done a 2016-2018 KX450F valve adjustment? I would love one of your detailed videos on that
Great video. We just purchased an old beater '05 kxf250. The seller said it is running fine but will need some maintenance attention. Our intent is to play with it then do lots over the winter. This is our first performance 4 cycle bike. (not my first 4c tho). So been watching a couple of your videos to get the feel for how these are put together and how they come apart. Well done Matt. ;) Will be checking the valves after we get a few casual rides in. Will be shimming them to maximum clearance. As the bike runs and the valves wear, they go deeper into the seats. Meaning the cam to bucket spacing will get smaller. The second bike I am looking at is an RMZ250. It looks near identical to the KXF, except it is yellow instead of green. So question -- are the engines pretty much the same thru n thru? I ask because the RMZ is seized so will be doing a complete tear down on that one to figure out what the problem is.
Yes, there are a few years where the RMZ & KXF are the same. Not sure of the year range though. I have a full engine rebuild video here: www.howtomotorcyclerepair.com/kx250ftopbottomrebuild/
This was great. Just watched the whole vid for entertainment purpose. (better learning something than watching just some random movie lol ) I just bought a '09 kx250f (my 1st mx bike) and I would love to work on it myself - eventually. But it's a bit intimidating for now. Your vids are informative and clear and you are real thorough. Damn, wish I had someone like you in the area with their own workshop... (but I'm in South-Africa)
peter csernak Check the valve clearance, make sure they are in spec. Then make sure fuel screw is set properly: ua-cam.com/video/RoRSfeJtEtw/v-deo.html Matt
Great vid and channel lots of help, had a question I’m checking my clearance and on both exhaust I can’t get the thinnest gauge thru, now do I just take the shim back to standard clearance or do I have a bigger problem?. Oh and it’s an 09 kx250f
When doing the chain tensioner I just unscrewed the clamp on the inlet to the engine and pull the carb out of the black rubber inlet and it allows you to push your carb out of the way instead of taking it off👍
That sucks. I will be uploading a top & bottom end rebuild video on this same bike this week. The case shifter detent pin snapped and cases needed to be replaced. Went ahead and installed new piston, rings, cam chain, etc..
MatthewMCRepair Can you up load the vid now, LOL I just changed a piston and the cam chain came off and I can not seem to get the chain guide in correct, I am stummped
hey i have a question, i know your vids old but i have a problem with my 06 kx 250f she starts first crank cold but when hot sometimes she dosent start. Also i hear like a ticking noise in the motor just did oil and filter change,air filter cleaned also. could it be the valves ?? thank you very much
another question. I am going to change my intake valves and springs to s.s. would it cause a problem if I only change the intake valves to s.s. and tougher springs? my exhaust valves never need shimming. would this make motor unbalanced?
hi, matt just bought a kfx250 2006, it had the top end done 3 months ago and has not been used since when i come to start it is a pain in the butt, if/when it starts oil comes out of the breather hose is that normal and then the bike just cuts out. any suggestions cheers
great video. I have the exact same bike.my first four stroke. I checked valves and all need shimming.i did the math and shimmed all values. but my left intake was tight. I shimmed it to spec as if it was at zero. after shimming my left intake is still at zero. what do I do now? new valves?
+MatthewMCRepair ok I checked the valve with no shim under bucket. I can get a shim under it .001 above the plane of the valve. is this bad or can I get a few more hours out of it before valve job?
good video but I disagree with one thing. Buying shims individually costs more as well as delays the job. The kits are not priced bad, especially if you do a lot of this work. What I have found is that even as I use shims for different jobs I am also replacing the shims with ones I have pulled out of these different jobs. Once in a great while I may get low on a common size and will order a few individual ones. If you do this work there is one kit that fits all the Japanese 250s and the same for the 450's. KTM also has their own size if you work on them. Hot Cams makes these Kits and well as Pro X and a few others. Avoid Cheap Shims? They don't withstand the wear. and as always ….braaaaap!
Gary, what is the temperature you try starting it in? And do you give it gas when trying to start it? Because you are not suppose to with fuel injection
Question. So my buddy gave me his bike to rebuild, which I did, now I’m stuck on valve shimming, the valves didn’t come with shims but I have a shim kit from PROX, I don’t wanna chase shims so how do I know which ones to use? (Ex. 2.00mm, 2.45mm)
How can you do all that without adding oil during re assembly? That is a crime!!!! Those parts will run dry for a few seconds when you start that engine and that will put a lot of extra and unnecessary wear on the components.
hi, can you put the automatic subtitles please? It's not easy understand english for me. And, where did you put the ring while closing the engine? Thanks
Your timing is most likely off. You tried to kick start it with all your weight on the kicker? If the motor locked up there is good chance you just bent your valves.
@MatthewMCRepair As I mentioned, great vid :) Now I know you get a lot of questions :D my Kawa '09 KX250F creeps forward in gear with clutch pulled. (It's my 1st mx type bike) Is this normal? since you know WAY more than I do with these bikes. If I rev it like twice before stopping with brakes it tends to be o.k. Doesn't feel right since I have other bikes and they don't do that....
Thanks. I did have the bike worked on recently so they fixed it. But it's good advise if one encounters this problem again. One of the things to look at.
Hi Matt. I have just done valve shims on rmz250 06 and am setting the timing, problem is the dots on cams don't line up perfectly with casing edge 9, 12, & 3 oclock. with the right hand bottom crank mark lined up, and the correct number of teeth between the cam dots, the dot on the ex valve is slightly above casing and inlet in equally below casing. if I shift it all 1 tooth forward then the dot on ex cam is slightly below the casing and the inlet dot equally above the casing. should cam dots line up perfect like picture in manual, How do I check for cam chain stretch.
wayne drew Wayne, contact me here so maybe you can send me some pics of how close you are: www.howtomotorcyclerepair.com/contact/ Most manual do not specify on how to measure a chain for stretch. If in doubt, replace chain since they are only about $30.
Thanks I just took it to the shop they said only one was out of spec now that I got it back when I put it in gear it stall and it didn't do it before I took it there and I noticed tonight when I put it up the pipe was glowing
Matt, I am desperate, I have an 11 kx250, it wont start when cold. It will pop start instantly. Once it's warmed up it starts fine. The local Kaw dealer here in Massachusetts says it starts in two kicks when i bring it in (twice), I feel foolish. I have an old 01 YZ 426 I can start up with ease (I don't think it's my lack of kicking). Any comments for me? I feel like i want to sell the bike, but the thing is mint, low low hours. Thanks for your comments, and great video btw.
I would verify that the hot start plunger in carb is working properly. Next, I would tune the fuel screw ("How-To: 4 Stroke MX Fuel Screw Adjustment YZF CRF KXF RMZ FCR "). I like to twist the throttle once really fast (only when cold) to give the motor a shot of fuel from acc pump. That usually results in a quick fire up.
very good, i will check that out. it's funny, the mechanic at the kaw dealer said keep your hand off the throttle (like, don't turn it). I will try these tips, it kills me that i can't start it. Thanks!
MatthewMCRepair Matt, also, I'm a bit ignorant, how does the carb blast (quick turning the throttle) fuel, isn't this EFI?? I thought the crank has to be turning for fuel to flow? Thanks again.
Well this is getting interesting, when I got home from work I gave the throttle a twist and sure enough it started after 5 or 6 kicks. I'm just baffled. I then took it for a spin. Got a bit of mud so I pressure washed it. About an hour later I couldn't get it to fire. And it took me 3 times pop starting to fire it. Oh well, I'll eventually get it figured out! Thanks for your comments l!
17:40 to 20:10 it is frozen. And I really wanted that portion. Can you fix it or re-upload this? I’m a Big fan. So would really appreciate it. Thank you.
+Fritz Casey Carlyle Not sure off the top of my head, been too long since I did this video. Go ahead and download the service manual from my site: www.howtomotorcyclerepair.com/kawasaki-kx250f-oem-service-manual-04-06/
Hey Matt.. I just recently bought an 09 kx250f and there's a bit of top end noise.. I took it to a local shop and they said it could be piston slap or valves.. Is there any way to determine what it is without getting in and looking at it?
nate hepler You can take a screwdriver to your ear or a stethoscope to try and determine the area where the noise is coming from. I do have a rebuild video on that bike, however it covers earlier years. I bet a good amount of the stuff is the same. www.howtomotorcyclerepair.com/kx250ftopbottomrebuild/
Ok thanks Matt.. I appreciate it.. Is there a noticeable difference whether it's the valves or piston.. Like for instance I know it's hard to start the bike when warm if valves are out of spec sometimes.. The bike starts first kick but is relatively hard to start when hot
nate hepler Nate, try adjusting the fuel screw as an improper setting can make it hard to start sometimes. Here is the video: www.howtomotorcyclerepair.com/how-to-4-stroke-mx-fuel-screw-adjustment-yzf-crf-kxf-rmz-fcr/ Matt
you probably have you're top dead center off. At least on honda's you have one inspection window on the transmission side and one on the cam so check both. The marks on the cams are lines wich should be parallel with the cylinder head. Had the same problem on my bike.
Hey brother I have a ? I adjusted my valve shims and put it back but my engine won't turn all the way is stoping like if it was hitting something.. what could that be
Victor Cruz more than likely valves hitting the top of your piston. double check timing and if tjat aint it youre gonna have to re shim it. one of the valves is too far into the cylinder
i got an kx250f -04 and i tried to do this mysef but when i assembled it wont kick... tha kick get stuck and cant kick it, i know why cous the cam lobe is touching the cup and wont go past it... what should i do ?
I have the same bike, KX250f 2006 and it seems I am losing it. I refilled my bike before my last ride to perfect amount and now I am low again. Would that be a valve problem? Can someone please explain what needs to be fixed or changed. Thanks
cole lagasse Sounds like piston rings and/or valve seals are the culprit. Here is the engine rebuild video if interested: www.howtomotorcyclerepair.com/kx250ftopbottomrebuild/ Matt
Is it just me, or do I hear a faint knock? Is this the way the bike is supposed to sound? My son just acquired a 2017 KX250F, sounds the same with that slight tap or knock. This is the first dirtbike in the house. His bike rides fine otherwise. Starts in 2 kicks.
Every bike will have different shim thicknesses, so don't go with what you see in the video. Or are you asking for part numbers? I buy them individually from RMatv under Pro X brand.
+Jacob Layne How have you determined it is getting fuel? Is the spark plug coming out wet? It wouldn't be a bad idea to put a new plug in (maybe it's fouled).
+Jacob Layne OK, fuel is coming out of the accelerator pump. Let's back up for a minute, what happened that all of a sudden is stopped running? Was it running fine the other day? Has it been sitting? Did you take it apart and now won't start? Give me some more details.
Im trying to time a 09 kx250f when line up the dots my exhaust cam is almost facing up then it hits on a valve or something and stops wont turn over but the dots are perfect. Can anyone help me?
Why did you measure in inches? Now you have to convert the measurements of the shims from millimeters to inches. And why does it still matter when every 0.5mm÷25.4=0.002in? You also never said that 25.4 is inches or centimeters.
Halo Tank Because I deal with english units on a daily basis and easier for me. I'd rather everyone use the metric system. I didn't cover conversions because we all learned that in grade school.
MatthewMCRepair Ok man your preference it's just more work since your caliper isn't metric. After all most dirt bikes are metric since there Japanese besides KTM. I have a problem with my bike and I think it's the shims. We have to bump to start it and once it's on and you give it throttle it kind of loses power. I also hear a popping in the crankshaft. What is your opinion? It has oil change, clean carbhoreator, new spark plug that's gapped, clean air filter. The oil filter had some metal specs in it. Don't know why. There like sand grain size.
Halo Tank What color where the metal specs? Magnetic or not? Have you tried removing the stator cover and checking the oil screen? Also, do you have a video of this thing running? Crankshaft popping? As in a rod knock?
Should be very similiar. Make sure you have the service manual before starting. Here it is: www.howtomotorcyclerepair.com/kawasaki-kx250f-oem-service-manual-04-06/
Just got this done. Had one bad intake valve. All i can say and I can’t express this enough but run lead addictive to your fuel on these four strokes! It will Cut this bullshit out!!
Bro. I love you I think. Thank you for having the only video on UA-cam on how to shim valves that makes any logical sense
You are an absolute legend. Just did my valves relying on this video and now my bike runs perfect, keep making vids like this bro
@@dukezity5226 yy try gy
literally been watching this over and over. I've owned over 20 strokes just picked up my first 250f. gives me full confidence to do the job myself.
Go for it. It's not a bad job.
Thank you for this video ive never work on a bike before I watched this video.i bought a 2005 KX250f and after this video I went to my garage and did what you did and now my bike runs good.thanks. keep up with the videos
Any update on your bike man??
The valves get tight over time as they wear into the head. If you have no clearance, and verified you are at TDC, you'll have to install a thinner shim and repeat the process. At a min, put in a shim that gives you max spec clearance, and you may find yourself in spec.
Hi Matthew I just wanted to ask. What are some good mods or absolute must haves for this engine type (04-05 kxf, 04-06 rmz) for this motor to run reliable ? I've got one I've done a new lower end on and want it to last me as long as I can and not have it lock up on me when I'm trail riding near a cliff.. thank you!!
@@jex8046send your head off to fastheads in georgia
I have studied and followed this video many times over and have fixed my bike. 2009 kx250f. Thank you sir !
Hey man you think you can give me some help? Please
Followed your video and now my bike starts first kick everytime. I really appreciate the information
This video is very good. The only thing I wish you included was links to buy all of the parts and supplies I need to do this, I just picked up an 07 KX250F and it’s quite difficult to start, has a ticking in the top end when started even know the top end and valves were replaced, and also will not idle without choke so I’ll be rebuilding the carb too. I need the torque wrench, hondabond, and whatever else you used.
Did you get it to work if so what was your problem 😊
Great video! However, it should be pointed out that 28 pins on the chain should be in between the 9 o’clock exhaust mark and the 3 o’clock intake mark.
Good job. After changing out the shims there is no need to reassemble the caps and chain to check the clearance. You can simply lay the cam in place and check the new clearance. The cams are not under any load at TDC so it's easy and if there is any further adjustment required you don't need to pull it all apart again. Just lift the cam and change the shim and once it all measures up right go ahead and button it all back up 😀
Well I was hoping to nail it the first time.
@@HTMR And you did. My comment was for those watching your video, with little or no real experience. Your step by step instructional videos are second to none
@@jamesrossmotors Thanks!
Muy buen video, el idioma no lo he entendido nada jejejejeje , pero como dice el dicho....... una imagen, vale mas que mil palabras. Gracias por el video...
thanks for this super video!
i just did my 09 KX250F, following step by step: got it all up-and-running again (I did have one Intake valve with NO tolerance; it had difficult cold starts since a coupe of weeks).
I was able to 'return' the chain tensioner without removing it (yes: did remove the spring); with 2 screwdrivers: you can slowly close it from the top...
thanks!!!
Cool. Glad the vid helped!
$1500 and we are located near Chicago. It needs graphics, one radiator, chain & sprockets, fork seals, ign coil, etc.
I have a 2009 250f and with hot cams the intake will not allow the engine to make a full revolution stock cams it’s fin but the marks on the intake cam have the lobes facing more towards the head but the engine will spin without contacting anything.
This video is spot on. Thank you so much for the help! One question though, why did you go a bit over the exhaust valves but well within the intake valves? I need to order shims but I was curious when doing the math for what I need. Thanks
I'll probably get assaulted in the comments but have you ever done a 2016-2018 KX450F valve adjustment? I would love one of your detailed videos on that
Great video. We just purchased an old beater '05 kxf250. The seller said it is running fine but will need some maintenance attention. Our intent is to play with it then do lots over the winter.
This is our first performance 4 cycle bike. (not my first 4c tho). So been watching a couple of your videos to get the feel for how these are put together and how they come apart. Well done Matt. ;)
Will be checking the valves after we get a few casual rides in. Will be shimming them to maximum clearance. As the bike runs and the valves wear, they go deeper into the seats. Meaning the cam to bucket spacing will get smaller.
The second bike I am looking at is an RMZ250. It looks near identical to the KXF, except it is yellow instead of green. So question -- are the engines pretty much the same thru n thru? I ask because the RMZ is seized so will be doing a complete tear down on that one to figure out what the problem is.
Yes, there are a few years where the RMZ & KXF are the same. Not sure of the year range though. I have a full engine rebuild video here: www.howtomotorcyclerepair.com/kx250ftopbottomrebuild/
This was great. Just watched the whole vid for entertainment purpose. (better learning something than watching just some random movie lol )
I just bought a '09 kx250f (my 1st mx bike) and I would love to work on it myself - eventually. But it's a bit intimidating for now. Your vids are informative and clear and you are real thorough. Damn, wish I had someone like you in the area with their own workshop... (but I'm in South-Africa)
Just go for it, that is how I got started. You have the service manual and a video, you won't need anything more.
Col thanks man :D and I'll be sure to check your vids for guidance. Keep making them :)
Have work on any newer bikes like a 2021kx250 if so I would like a video on that man great job me and a buddy of mine are going to do mine soon
Awesome vid ,thanks , may i have a question , my 2007 kawi starts right up when it's cold but hard to start when it's hot even with the hot start ?
peter csernak Check the valve clearance, make sure they are in spec. Then make sure fuel screw is set properly:
ua-cam.com/video/RoRSfeJtEtw/v-deo.html
Matt
Thanks helped a lot ! I was thinking the same but have to check the valves before adjusting the fuel mixture
Great vid and channel lots of help, had a question I’m checking my clearance and on both exhaust I can’t get the thinnest gauge thru, now do I just take the shim back to standard clearance or do I have a bigger problem?. Oh and it’s an 09 kx250f
Your valves are starting to wear. Reshim them and check to see if they move after 1-2hrs of riding.
When doing the chain tensioner I just unscrewed the clamp on the inlet to the engine and pull the carb out of the black rubber inlet and it allows you to push your carb out of the way instead of taking it off👍
+James Teel Cool, thanks for the tip.
Nice video found this very usefull as I've got this to do on my kxf 250 05 it dropped a valve last week :)
That sucks. I will be uploading a top & bottom end rebuild video on this same bike this week. The case shifter detent pin snapped and cases needed to be replaced. Went ahead and installed new piston, rings, cam chain, etc..
MatthewMCRepair
Can you up load the vid now, LOL I just changed a piston and the cam chain came off and I can not seem to get the chain guide in correct, I am stummped
Is it the same job for klx300r last generation ? Please
hey i have a question, i know your vids old but i have a problem with my 06 kx 250f she starts first crank cold but when hot sometimes she dosent start. Also i hear like a ticking noise in the motor just did oil and filter change,air filter cleaned also. could it be the valves ?? thank you very much
So you like to aim for the highest clearance on both exhaust and intake? Got my head apart now, just need to order shims!
I shoot for middle to high end of spec since valves get tighter over time. Less adjusting this way.
Awesome video but did he put oil in it
No, I work on bikes for people and upload videos I think are helpful.
another question. I am going to change my intake valves and springs to s.s. would it cause a problem if I only change the intake valves to s.s. and tougher springs? my exhaust valves never need shimming. would this make motor unbalanced?
hi, matt just bought a kfx250 2006, it had the top end done 3 months ago and has not been used since when i come to start it is a pain in the butt, if/when it starts oil comes out of the breather hose is that normal and then the bike just cuts out.
any suggestions
cheers
great video. I have the exact same bike.my first four stroke. I checked valves and all need shimming.i did the math and shimmed all values. but my left intake was tight. I shimmed it to spec as if it was at zero. after shimming my left intake is still at zero. what do I do now? new valves?
Keep reducing shim thickness until you get clearance. Recheck after 1 hr of ride time. If valves get tight again quickly, time for a valve job.
+MatthewMCRepair
ok thanks. I'll give it a try
+MatthewMCRepair
ok I checked the valve with no shim under bucket. I can get a shim under it .001 above the plane of the valve. is this bad or can I get a few more hours out of it before valve job?
It won't sit correctly w/o a shim. Go buy some thinner shims and recheck lash.
Mhm I have a 04 kx250f and there’s 3 timing marks but 2 of them are by eachother. Which one do I go off of?
good video but I disagree with one thing. Buying shims individually costs more as well as delays the job. The kits are not priced bad, especially if you do a lot of this work. What I have found is that even as I use shims for different jobs I am also replacing the shims with ones I have pulled out of these different jobs. Once in a great while I may get low on a common size and will order a few individual ones.
If you do this work there is one kit that fits all the Japanese 250s and the same for the 450's. KTM also has their own size if you work on them. Hot Cams makes these Kits and well as Pro X and a few others. Avoid Cheap Shims? They don't withstand the wear.
and as always ….braaaaap!
Gary, what is the temperature you try starting it in? And do you give it gas when trying to start it? Because you are not suppose to with fuel injection
Question. So my buddy gave me his bike to rebuild, which I did, now I’m stuck on valve shimming, the valves didn’t come with shims but I have a shim kit from PROX, I don’t wanna chase shims so how do I know which ones to use? (Ex. 2.00mm, 2.45mm)
You have to guess and adjust from there.
How can you do all that without adding oil during re assembly? That is a crime!!!! Those parts will run dry for a few seconds when you start that engine and that will put a lot of extra and unnecessary wear on the components.
fred flintstone how do you suggest re oiling during re assembly? I’m about to do this to mine.
@@ShredStudios add assembly grease to the cam wheel shafts and add a little oil to the parts you remove before reinstalling and you should be good
Thanks for this video. Its given me the confidence to do this job myself.
Your welcome!
hi, can you put the automatic subtitles please? It's not easy understand english for me.
And, where did you put the ring while closing the engine? Thanks
What torque wrench are you using in this video
Hey mate. Give it a go myself but pretty much fucked the job the thing can't just turn over with all my weight 80kg where did I go wrong to big shims?
Your timing is most likely off. You tried to kick start it with all your weight on the kicker? If the motor locked up there is good chance you just bent your valves.
@MatthewMCRepair As I mentioned, great vid :) Now I know you get a lot of questions :D my Kawa '09 KX250F creeps forward in gear with clutch pulled. (It's my 1st mx type bike) Is this normal? since you know WAY more than I do with these bikes. If I rev it like twice before stopping with brakes it tends to be o.k. Doesn't feel right since I have other bikes and they don't do that....
Same hear except mine is an 04
+Stanman121 It's possible that your clutch basket is notched and the plates can't disengage.
Thanks. I did have the bike worked on recently so they fixed it. But it's good advise if one encounters this problem again. One of the things to look at.
Hi Matt.
I have just done valve shims on rmz250 06 and am setting the timing, problem is the dots on cams don't line up perfectly with casing edge 9, 12, & 3 oclock. with the right hand bottom crank mark lined up, and the correct number of teeth between the cam dots, the dot on the ex valve is slightly above casing and inlet in equally below casing. if I shift it all 1 tooth forward then the dot on ex cam is slightly below the casing and the inlet dot equally above the casing. should cam dots line up perfect like picture in manual, How do I check for cam chain stretch.
wayne drew Wayne, contact me here so maybe you can send me some pics of how close you are:
www.howtomotorcyclerepair.com/contact/
Most manual do not specify on how to measure a chain for stretch. If in doubt, replace chain since they are only about $30.
Thanks I just took it to the shop they said only one was out of spec now that I got it back when I put it in gear it stall and it didn't do it before I took it there and I noticed tonight when I put it up the pipe was glowing
Huh????????????? Speak English.
what year model is this Kawa?
Matt, I am desperate, I have an 11 kx250, it wont start when cold. It will pop start instantly. Once it's warmed up it starts fine. The local Kaw dealer here in Massachusetts says it starts in two kicks when i bring it in (twice), I feel foolish. I have an old 01 YZ 426 I can start up with ease (I don't think it's my lack of kicking). Any comments for me? I feel like i want to sell the bike, but the thing is mint, low low hours. Thanks for your comments, and great video btw.
I would verify that the hot start plunger in carb is working properly. Next, I would tune the fuel screw ("How-To: 4 Stroke MX Fuel Screw Adjustment YZF CRF KXF RMZ FCR ").
I like to twist the throttle once really fast (only when cold) to give the motor a shot of fuel from acc pump. That usually results in a quick fire up.
very good, i will check that out. it's funny, the mechanic at the kaw dealer said keep your hand off the throttle (like, don't turn it). I will try these tips, it kills me that i can't start it. Thanks!
MatthewMCRepair
Matt, also, I'm a bit ignorant, how does the carb blast (quick turning the throttle) fuel, isn't this EFI?? I thought the crank has to be turning for fuel to flow? Thanks again.
Gary Wilson Gary, your right. Disregard what I said. I was thinking yours is an 06' like in the video.
Well this is getting interesting, when I got home from work I gave the throttle a twist and sure enough it started after 5 or 6 kicks. I'm just baffled. I then took it for a spin. Got a bit of mud so I pressure washed it. About an hour later I couldn't get it to fire. And it took me 3 times pop starting to fire it. Oh well, I'll eventually get it figured out! Thanks for your comments l!
Hey Matthew.
Is this the same on the 2015 model? Thank you very much!
Probably. I don't have the service manual to verify.
Jonas Hansen was it the same?
I haven't checked, found out I didn't need to.
Matt, and Ryan, I feel like a stump, I was kicking it like the old days, once I started kicking at TDC the bike fires right up,
My dirtbike engine top filled with oil is this normal?
On the shims did you go with 7.48 or 9.48?
7.48
what are the spec for the valve clearence? i just bought the same bike same year but having trouble turning it on so i want to chexk the valves
he said in the video 4-6 on intake 7-9 on the exhaust
How do y make that the motor don't spin if y have all out.
17:40 to 20:10 it is frozen. And I really wanted that portion. Can you fix it or re-upload this? I’m a Big fan. So would really appreciate it. Thank you.
Well that sucks. Let me locate this file and try and upload.
Is the process same with revalving a kxf450 2009?...
Same process. Refer to service manual for torque specs etc...
would the timing marks be the same for a 2005 kx250f
I'm pretty sure they are the same.
sir what is the standard valve clearance for kxf250 2006 model intake and exhaust valves...thanks in advance for your feedback
+Fritz Casey Carlyle Not sure off the top of my head, been too long since I did this video. Go ahead and download the service manual from my site: www.howtomotorcyclerepair.com/kawasaki-kx250f-oem-service-manual-04-06/
Hey Matt.. I just recently bought an 09 kx250f and there's a bit of top end noise.. I took it to a local shop and they said it could be piston slap or valves.. Is there any way to determine what it is without getting in and looking at it?
nate hepler You can take a screwdriver to your ear or a stethoscope to try and determine the area where the noise is coming from.
I do have a rebuild video on that bike, however it covers earlier years. I bet a good amount of the stuff is the same.
www.howtomotorcyclerepair.com/kx250ftopbottomrebuild/
Ok thanks Matt.. I appreciate it.. Is there a noticeable difference whether it's the valves or piston.. Like for instance I know it's hard to start the bike when warm if valves are out of spec sometimes.. The bike starts first kick but is relatively hard to start when hot
nate hepler Nate, try adjusting the fuel screw as an improper setting can make it hard to start sometimes. Here is the video:
www.howtomotorcyclerepair.com/how-to-4-stroke-mx-fuel-screw-adjustment-yzf-crf-kxf-rmz-fcr/
Matt
Ok thank you man.. I appreciate it so much.. Have a great day and keep up the excellent work! God bless!
nate hepler No problem. Let me know what you find.
Do you got to force the gauge to get it to go or should it slide right under
It should slide in with a slight drag. You may have to fight with the thinner gauges since they are flimsy.
you probably have you're top dead center off. At least on honda's you have one inspection window on the transmission side and one on the cam so check both. The marks on the cams are lines wich should be parallel with the cylinder head. Had the same problem on my bike.
Do you think this is the same on a 2016 kx250f
Probably 80% same. The cam carrier is different I believe.
Is the spec the same for a 2000 mojave 250
Hey brother I have a ? I adjusted my valve shims and put it back but my engine won't turn all the way is stoping like if it was hitting something.. what could that be
Victor Cruz more than likely valves hitting the top of your piston. double check timing and if tjat aint it youre gonna have to re shim it. one of the valves is too far into the cylinder
Okay I fix it thank you.. I still don't have any compression what do you recommend for that? take the head and piston and check them?
Doing a rebuild love the information
do u just buy nd sell bikes doin em up ?
i got an kx250f -04 and i tried to do this mysef but when i assembled it wont kick... tha kick get stuck and cant kick it, i know why cous the cam lobe is touching the cup and wont go past it... what should i do ?
MotoVloggKid Don't kick it anymore and double check your cam timing.
i fixt it, thanks alot :)
MotoVloggKid Was it the cam timing?
the shim wasent in the right place under the cup haha ^^ thanks to a secound look at ur vid i manage to fix it ! thanks :)
MotoVloggKid Glad you figured it out.
best video so far. thank you
K so I shouldn't have to force the valve down to get it to go in and thanks for the reply
Nope.
What could cause engine vibration around 5000-6000 RPM?
1978 Yamaha XS750 SE
I have the same bike, KX250f 2006 and it seems I am losing it. I refilled my bike before my last ride to perfect amount and now I am low again. Would that be a valve problem? Can someone please explain what needs to be fixed or changed. Thanks
cole lagasse Low on what?
Sorry I didn't mention it. I'm losing oil. MatthewMCRepair
cole lagasse Cole, do you notice any oil puking out the breather tube? Any blue smoke out the exhaust?
well there is a lot of smoke and sometimes it is blue i believe.
cole lagasse Sounds like piston rings and/or valve seals are the culprit. Here is the engine rebuild video if interested:
www.howtomotorcyclerepair.com/kx250ftopbottomrebuild/
Matt
Will this work on my rmz 250 2005?
Thank you
Yes
Quick question what kind of oil did you use ?
Don't remember. I usually use Honda HP4 10w40 since it is available locally.
MatthewMCRepair ok cool I'll look into it
hey what's going on at the 17:45 area. the video just freezes but its still playing. for a few minutes. its just frooze.
Well that sucks. Looks like the video is becoming corrupt, it never used to do that.
Is it just me, or do I hear a faint knock? Is this the way the bike is supposed to sound? My son just acquired a 2017 KX250F, sounds the same with that slight tap or knock. This is the first dirtbike in the house. His bike rides fine otherwise. Starts in 2 kicks.
That is the way they sound
what were the new shims numbers that you used to replace the old ones ?
Every bike will have different shim thicknesses, so don't go with what you see in the video. Or are you asking for part numbers? I buy them individually from RMatv under Pro X brand.
What if there's no clearance in the intake valves ???
I have the same bike it will kick but won't start, Its getting fuel and spark but won't start. Any suggestions?
+Jacob Layne How have you determined it is getting fuel? Is the spark plug coming out wet? It wouldn't be a bad idea to put a new plug in (maybe it's fouled).
The plug did have fuel on it when I pulled it out but its a brand new plug.
I pulled the carb and cranked the throttle and fuel is coming out of the needle
+Jacob Layne OK, fuel is coming out of the accelerator pump. Let's back up for a minute, what happened that all of a sudden is stopped running? Was it running fine the other day? Has it been sitting? Did you take it apart and now won't start? Give me some more details.
Thanks!
Im trying to time a 09 kx250f when line up the dots my exhaust cam is almost facing up then it hits on a valve or something and stops wont turn over but the dots are perfect. Can anyone help me?
Shoot me an email here so you can share pics: www.howtomotorcyclerepair.com/contact/
What were u unsqrewing at 8:39 I'm new to this
spark plug
Give me standard clearance valve in and out mate?
What if chain comes of bottom? I seem to have lost slack when putting my cams back it
There is a guide on crank sprocket to prevent chain falling off.
Thanks this video was really helpful!
Philip Pattengale No problem!
Thanx man ... great tutorial
very nice job. thanks for the video.
Ζαφείρης Μιχαλακέλης Your welcome.
what size wrench do you need to take the spark out
kevin theriault 5/8 IIRC
how tight should the spark plug be because my manual says turn 1/8 and i don't know what that means?
Just snug it up. They are referring 1/8 turn after the plug is seated all the way.
+MatthewMCRepair ok thanks
What the valve clearance on a kx450f 2007
I don't know off the top of my head and don't have the service manual, sorry.
Awesome video
nice vid love the detail
Why did you measure in inches? Now you have to convert the measurements of the shims from millimeters to inches. And why does it still matter when every 0.5mm÷25.4=0.002in? You also never said that 25.4 is inches or centimeters.
Halo Tank Because I deal with english units on a daily basis and easier for me. I'd rather everyone use the metric system. I didn't cover conversions because we all learned that in grade school.
MatthewMCRepair Ok man your preference it's just more work since your caliper isn't metric. After all most dirt bikes are metric since there Japanese besides KTM. I have a problem with my bike and I think it's the shims. We have to bump to start it and once it's on and you give it throttle it kind of loses power. I also hear a popping in the crankshaft. What is your opinion? It has oil change, clean carbhoreator, new spark plug that's gapped, clean air filter. The oil filter had some metal specs in it. Don't know why. There like sand grain size.
Halo Tank What color where the metal specs? Magnetic or not? Have you tried removing the stator cover and checking the oil screen?
Also, do you have a video of this thing running? Crankshaft popping? As in a rod knock?
well I have a 2004 Kx250f ?? still be different.
Should be very similiar. Make sure you have the service manual before starting. Here it is: www.howtomotorcyclerepair.com/kawasaki-kx250f-oem-service-manual-04-06/
u shud b workin 4 a mx race team lyk ryan villapoto team or james stewart
If you were at TDC when you took it apart then your valve timing was out.
Véry good , Thx for this tuto . :)
Thx m8 you help me save alot of cash :P
great vid very helpfull.
well good job nd they r bloody helpfull
I dont know the matt when calculating the new shims!! Heelp! Only need intake
Download service manual from my site. It has a helpful chart.
I did it now! Thanks:) will buy u a beer!
Glad you figured it out!
Maybe it was mentioned already but you lose torque when using a extension. There's a formula to use when doing that
Actually you do not lose torque when using an extension ua-cam.com/video/tRR96ILGORU/v-deo.html watch that video and you will see why.
You only lose torque when changing angles
Just got this done. Had one bad intake valve. All i can say and I can’t express this enough but run lead addictive to your fuel on these four strokes! It will Cut this bullshit out!!
thanks man.
what did he pay for that bike?