How-To: Honda Z50R XR50R CRF50F Engine Rebuild 1968-2015
Вставка
- Опубліковано 18 вер 2024
- www.howtomotor...
CLICK link above for full length video and FREE service manuals.
Now on Facebook. Give me a Like.
/ howtomotorcyclerepair
Sign up for my newsletter! Get emailed when new videos come out.
www.howtomotorc...
I bought this bike with engine completely disassembled. I spent the past month piecing it back together and found why it was taken apart: there was a shifting problem.
Here is what the video covers:
What is covered in this video?
Complete top and bottom end disassembly
Splitting the cases
Complete transmission disassembly and reassembly
Clutch disassembly and reassembly (including plates and springs)
Oil pump disassembly and reassembly
Cylinder head disassembly and reassembly(with valve lapping tutorial)
New valve stem seal installation
Cam timing procedure
Piston ring end gap inspection
Some measurements (cylinder bore & piston O.D.)
What is not covered in this video?
Engine removal & installation from frame. Video begins with engine on workbench
Transmission blind needle bearing removal in engine cases
Main bearing removal from crankshaft
Some engine parts are missing during disassembly (parts are added during reassembly and covered in detail)
Link to full engine rebuild -> gumroad.com/l/zBTB
I did all this in 1967. Took the cases and piston to metal shop at school and buffed them to a chrome like shine. It was beautiful. Nobody had one like it.
This is beautiful it's like listening to Michael Douglas rebuild a motor I love it
LOL
such a good dad with the two kids always on the move.
Thanks buddy :)
MatthewMCRepair my z50r smokes and is a pain in the butt to start. I have to roll start it and it fouls a spark plug everytime I ride it. I thought it was running rich and I bought a new carb bc it was old and I tuned a new one and it did not work. it does not idle correctly and it is very sluggish. the amount of carbon is crazy. when it's warmed up I can start with the kick start but when it's cold I spend about 30 to 45 minuts trying to start plz help me because I cannot find any thing else to fix it. if u read this thank you and have a good day
Test the compression and adjust the valves: ua-cam.com/video/zwtX8pmmpb8/v-deo.html
If it smokes due to oil burning, well you will have to address that with a rebuild.
MatthewMCRepair I don't have a way to test it
Buy the tester mentioned here: www.howtomotorcyclerepair.com/how-to-motorcycle-compression-test/
It costs about $40
Bro, crashed my pitbike went to get new parts
Had no idea what to do when I pulled the crank case engine cover off. You explained it perfectly. Because of you I was able to fix my bike and get back on it same day. Thank u sir
Hi where do you get your parts ?
CAR MAC 1 I get my parts from a local whole sale dealer out here in Stockton,ca
Matthew, appreciate your video on the z50. Adding a comment about removing the phillips headed screws which you are probably already aware of. I am 56 and as hard to believe as I find it I recently learned a very effective method for removing these screws. The method is simple. Instead of trying to loosen these screws it is better to first crack them by trying to tighten them. This works in a very high percentage of cases. Usually the screw head is somewhat striped in the direction of removal but seldom are they striped in the direction of tighten. Tighten them just a bit and then loosen. Thanks again, John
Hi John, on those screws, I use a JIS #3 driver. They are not phillips and will strip easier. I use a impact or vessel drivers that have an impact built in. The vessels work on all but the stubborn ones. Here is a link to the vessel:
amzn.to/2gXIhYg
Thanks for all of the great videos, Matt. We watched the carb video, and my son did the carb himself. It was his first one, and he got it on the first try just by watching your video!
I will be buying the extended version so that my son and I can tear down our '74 and actually get it back together the first time.
Awesome!
I really like the kids involved. great job dad !
Thanks!
Great Job Brother ! I have 3 Sons who been riding since they were 5 yrs old and we been building, modifying and restoring Bikes for about 6 yrs now. I learned everything about these engines off You tube. My kids teach me now.....Great Video !!!
Nice, many of our followers will be interested in your video...Thanks for sharing.
Yup added to my tool collection after watching this...lol. Also subbed
Hola Matt, first I have to say it is very nice of you to post this, the vids are clear (not a very common thing on YT) but I wish you had shown how to disassemble the cylinder head, specially the valve seats, the rocker arms and everything else.
If you ever had to time I'd appreciate it, if you ever come to Spain, I'll buy you a beer.
John, I cover everything you mentioned in the full length video, which is available for purchase only.
I'll take you up on that beer someday!
This man really tore down an entire engine and skipped literally the only bit I needed to know
If you ask him he will reply
You are a very good mechanic
Thank you!
Great video. I could disassemble but I would never remember how to put it back together.
It is great to know about to rebuild the engine.
I have a 1978 Z50, as it has been well stored the engine has been not working for some years.
A check before starting is required. In other words, change oil and new gasoline, and new air filter is not enough.
What more could be required?
Wow one of the best videos nice easy pace and explained very well!!!
nice video man
magnificent video
Great dad
Z50r is definitely my favourite I own a 1995 1996 And I will never get rid of them
Yeah they are fun!
Hi there, nice video!! I have a 1983 z50r. You think I’ll be able to put a crf 70 plug and play?? What else do I need?
Also is mine 12v system ?? Thank you 😎
He's good!
Great informative video. Thanks
This is a great video, but you jump forward a lot in the editing and I miss the end of the explanation.
The full video is available here: www.howtomotorcyclerepair.com/z50enginerebuild/
The fact u can crank it with ur Hand like that means compression is forsure low
Excellent video. Subscribed to your channel.
I have an issue with my timing chain its creating too much knocking noise and is a bit loose.
I m suspecting something is wrong with its cam chain tensioner.
when you were assembling it by inserting the rod you the holes in the rod were in one particular direction can they be in any direction? Or is there any notch in it to avoid incorrect instalation?
Any video on just troubleshooting loose cam chain?
I got a 1971 Honda z50 I’m about to rebuild.
Cool!
On a how to you should show everything been removed and how to take it off u did good but the video aspect was eh but enough to go by
great vid man !
+Sam Liekens Thanks!
I'm doing the same job but do the clutch suppose to spin if so mine wont what's wrong
This video should work for the CRF70 also correct? The engines seem to be almost identical, I would think the only difference is the cylinder and piston size?
Yes.
A+ video!, I am about to inherit a 1968 Mini Trail 50 hasn't run since probably the late 80's which was probably a tune up issue. Would you rebuild that engine cause it sat so long?
No, I would just try and start it. If it was stored indoors, then it should be OK.
You kick ass!
Can you tell me what the parts are called ...the arm with the spring connected to stopper arm that let's you shift gears?
I just bought a 1978 Honda z50a. It has a leak at the shifter. Do I just need to replace left crankcase gasket? If so, where do I find the gaskets? What web page do you find your parts?
Hey man I'm about to do a fun build. It's a 50cc honda engine that is on these cheap quads.my question is. Can i put a 150cc top end on that and make it a 150cc? What's the difference in the bottom ends from the cc series?
I don't know
Were is the cheapest place to buy all of our oem parts for our xr and crf 50 s ?
Hello Matt!
I really hope you can help me, I was riding pretty good on a track on my kx250f 2007 and when it got really warm it shut down, but I could easily start it up after that, what do you think it is?
Hi Matthew, I have a Z50M 1967, I want to do a complete overhaul of the engine and put it to work, It had 8 years stored. How should I start? what do you recommend?
Does the engine need a rebuild? Why not just try to get it running?
I have fixed the "monkeytype" engines for 6 years now, id like to say that change gearbox oils and cylinder and maybe cylinder top
+piston
Are the Honda manuals no longer available? I wanted the 68-74 but can't find where to download of your sight. Thanks
They are available with engine rebuild video purchase.
@@HTMR I misunderstood. Thanks for the reply.
I'm trying to fix up a similar, 66 s90 motor. I did pry off the left cover with a screwdriver (I'm new at this and I was too eager). I'm worried I may have nicked and scratched the edges a bit. Will a good gasket take care of it? Or is there some other fix I should try?
The left cover for the stator/flywheel? If so, that cover does not hold any fluids, so you should be OK. If you want, email me here and you can send me a pic:www.howtomotorcyclerepair.com/contact/
What does the oil pipe and spring look like?
I need a manual for a 1984z50r Honda motorcycle
Great Video .I got one today doesn't start working on it . it's a 50cc qgy-2 lifan monkey bike . it's needs parts I can't find parts .do you where to get parts ? New subscriber 👍🇨🇦
Hi Matthew, I'm assuming this is primarily the same for the 70 size engine too correct?
Yes
good videos man...have you ever done any porting? i see alot of porting videos around, but noticed you don't have any
No, never attempted any porting. Maybe in the future. Thanks for the compliments.
where can I find that shifter arm. The first piece after the cover was removed. That is what is broken on mine.
ua-cam.com/video/eqe59cINk7A/v-deo.html
hi ,great vid by the way can you say what i may have done wrong on my kick start shaft when i try to kick it over it seems to be crunch up against some thing i dont think i have put the shaft back it right as it is making a tapping sound if i turn the fly wheel and when it as started
+john doherty Hi John, not sure what your issue is, however sounds like it needs to come back apart :(
um took another look at it and as i was taken it apart i could see the the kick start shaft had not engaged on the small metal lug so done that and it all went well after this works like new ,
Is the full length video an online video or an actual DVD. If it's online and I purchase it on my laptop can I also watch it on the computer I have set up in the garage? Look forward to seeing all the details!
It is a video that you stream instantly. It's yours forever with unlimited views. You will need internet connection to view it. Think of it like a youtube video with a log in. Let me know if you have any other questions.
Is this the three speed down trans? How are u supposed to drive it? There is not clutch handle? Just shift at idle then throttle up let off and shift? Or throttle up high rpm let off and shift?
3 up. This has an auto clutch. Clutch engages when you shift up and down (halfway actually).
@@HTMR so up is 1, up again is 2 etc?
@@technologyguy101 Yes. The earlier models were 3 down.
@@HTMR mines a 78 so three down?
@@technologyguy101 In 88' they went to 3 up.
hey man i got a baja dr50 an i need a left an right crank case for it an i cant find any parts for it its a clone of a honda
is this the motor the 1p39FMB copied?
Yes.
Cool
I have a 2013 First Bike Energic made in Romania same engine. It is a good engine? I do not know if is ok. I buy this bike in october 2020. I chanke oil motul 7100 every 1000 km. It is ok this engine? Sorry for my english how many km this engine resist? It is a street bike so that it is ok i thing. Yamasaki from usa have this engine too i think.
The Honda engines are bulletproof. Your knock off brand is a clone.
@@HTMR i know that but they say it is made by honda but in china. You think it is not ok? Yamasaki ym50, lexmoto, Shock bike from Poland and many bike have this kind of engine
Hey man I have a question about my xr50 if you could help me out that would be sweet
Sure whats up
I have a 1989 Honda Z50 and I'm debating on whether to fix it now or wait , But my problem is that from people over the years neutral slamming and power shifting , it now has shift problems. There is no 1st , or 2nd gear . Just neutral and 3rd , I'm kind of at a lost , I replaced the main gear on the right hand side it had 1 missing tooth and it didn't change a thing . A reply would be very appreciated thanks! MatthewMcRepair
At a minimum, check the shift drum bolt on LH side under the rubber cap. Next, pull the RH cover and see if you can shift it through the gears. If all else fails, you need to split the cases. And yes, you should fix it!
Jagger Timoszyk
Definitely restore the z50 to mint. I have a 84 I restored. These Bikes are highly collectible. I did the whole bike. Powder coated. New seat and rebuilt the engine.
Hello!
How much may the crankshaft axial play maximum? how is it set?
+vasutasjanko Not sure if any axial is allowed. I have the service manuals on my site, go ahead and download them for free and see if anything is stated.
I have a 1984 Honda z50r is that the same engine as yours ?
Yes except yours has points, mine has CDI
nice video!! a yr ago i took apart the case like in this video and after i put it back together and when trying to kick start it , it slips to wear it doesn't crank for compression , do you know what i did wrong? i can't seem to figure it out. thanks
So the kickstarter does not engage? Probably did not clock the spring correctly?
If the clutch was miss adjusted it will allow you to kick it but not actually turn the engine over
Hello Mathew,
I purchased the full xr50 engine rebuild.
I need to replace the small bearing in the right crankcase that holds the transmission still. It has some junk in it. I cant seem to find out how to remove it or find a part number for that matter. Any ideas?
Can you please email me a pic? You should have my email, if not let me know.
@@HTMR I tried the contact form on your website but it said it wasnt working
@@HTMR emailed
Great video! Where did you get the JIS impact driver? I have never seen one like that.
I have links here: www.howtomotorcyclerepair.com/jisscrewdriver/
MatthewMCRepair thank you!
Not sure if you answer questions but i have a 03 xr 50 and the top end has low compression so i ordered new piston and rings with all the new gaskets do i need to gap the rings and hine the cylinder head the cylinder head looks smooth and you can still see the cross hatch pattern looks good still this is my 1st attempt at anything internal can i just put it togather or do i need to gap the rings and hone the cylinder?
Let me first ask how you determined low compression? What brand gauge? And what was compression? Did you perform a leak down test to see where the air is going?
@@HTMR
Hi matt thanks for replying i checked for spark that was good i checked timing that was good i took a oem carb throttle cable cdi and wire harness off a running bike and put it all on the bad motor and still no luck the way i determine it was compression was i put my finger in the spark plug hole and kicked it over and felt nothing at all then i added some oil to the top of cylinder and gave a kicked it over with my finger on the hole and felt some compression so according to the university of UA-cam it had no compression so a watched your rebuild on the monkey and adjusted my valves perfectly and still no luck so i tore into this engine and the piston is fried so i ordered a piston and ring kit in hopes to get the bike running by next week for our camping trip worst case i will order i full top end kit but i sure would like to nail this piston job the kit was only $20 even if it last one camping trip id be happy iv done pistons and rings in my parents honda crv and we did hone the cylinder but im not so sure about the small motors and given this is a oem cylinder i value it a tad more than the cheap aftermarket ones so id like to prep it correctly so the rings seat nice i no just enough to mess it up .
@@mrbucket3347 OK, so to answer your original question, the service manual has specs for cylinder max diameter and ring gap etc. You need to measure everything and compare to the values listed in the service manual. If the piston was fried, then you need to bore the cylinder or find a new one.
@@HTMR 10-4
@@HTMR Thank you !
Can you give a list of needed tools?
All that info is here: www.howtomotorcyclerepair.com/z50enginerebuild/
hey I was wondering if the position on your shift drum stopper plate is fine. when I rebuilt my engine the flat side of the star was on the 9oclock side like this is in the video at 32:50. I'm having trouble shifting without running and I'm not sure if this position is the problem or the spindle arms. thanks for any info
That plate can be in 4 different positions depending on what gear it is in.
MatthewMCRepair right, I just wasn't sure if during rebuild if it should be in any particular orientation. thanks for the reply
Went to his site and don’t see where you came from download manuals, anyone?
They are included with full rebuild video.
Do you have to take the right crankcase apart in order to split the middle and left crankcase?
+corvettecraver Yes. What are you trying to fix exactly?
+MatthewMCRepair replace the left crankcase because of a crack. It's off a ssr 110.
+corvettecraver Gotcha. Did the chain fall off and bust your case?
+MatthewMCRepair fortunately my reckless riding hasn't broken anything yet (knock on wood). The crack was caused by the previous owner having the back shock loose which caused excess tension in the chain causing it to crack the case. Thankfully today I was able to split the middle and left crankcase without having to play around with the right side and now have began putting it back together again. Thanks for the video (it helped a lot) and thanks for the quick responses!
+corvettecraver OK, good to know that the left side will come off. I see now what you were trying to accomplish.
Amigo yo tengo una z50 como hago para conseguir los anillos en std
Use google translate.
hey if you live in San Diego I would love for you to work on my motorcycle I have a honda sl90
+profanepunk I'm in chicago.
will this video be pretty much the same for a xr70R?
Yes.
The XR50 and 70 are very similar, The main difference is the crank is slightly beefier, And the top end.
Hello Matt,
i have a kymco k pipe 50 and my semi clutch is acting weird.
On a cold engine, i start an put it in 1st gear and the engine turns off, the bike wants to go drive, so i have to rev and then put it in gear, and keep reving till im driving.
The clutch is ticking and when i slowly put it in 1st gear the ticking gets worse, then rev to prevent the engine turn off.
Is seems the engine has to work hard and the bike wants to creep.
Sorry for the bad English , im from the netherlands
Have you tried adjusting the auto clutch? You do have a nut with slotted screw on RH side?
MatthewMCRepair yes i did.
Makes no diffrence in rattle noise,and keep creeping.
I replaced the plates allready but no diffrence. The clutch keeps knocking.
Maybe buy a new clutch?
I think you need to take it apart and see whats up.
MatthewMCRepair
I posted an video in my channel ua-cam.com/video/YYoNyqTVi1k/v-deo.html
Not sure what that noise is. I'd pull the RH cover off and take a look.
How does buying the full video work? Im interested in it...is it a download or mailed to me on a dvd? And if it is a download is there a limit on how many times you can watch it?
Aaron M Hi Aaron, the full video is instantly streamed with unlimited views. This way you can start wrenching right away. Let me know if you have any other questions. Matt
MatthewMCRepair Awesome! Thank you!
Aaron M Your welcome. Good luck on your build. Email me with any questions.
MatthewMCRepair Just bought it...watching it now, thanks again!!
Aaron M Sweet...thanks! Let me know what you think of it.
Do you have any experience with lifan, or the Skyteam copy ??
I'm working on these to now and trying to find info
got a Tinder date this Saturda about 4 hours away, and I really need help
I don't know much about those engines. Have fun on your date :)
@@HTMR really ? They are basically the same engine
In any way
I'm in my garage right now
I got this 125cc Skyteam DAX. Can't see the difference between the hondas, the Lifans and the DAX's
@@RegulareoldNorseBoy I know they are similiar/same, just saying I never worked on them and can't help in that regard.
Why did you place it in the grill?
ua-cam.com/video/R-d5Q2TRLvI/v-deo.html
How long does this take just rebuilding it
6-8 hours probably
Making people pay for the full video lol
Do you show up to work for free?
Hey could you tell me the part number to that spark plug
john McMurray I got you hold up
I have a question i have a honda dax like 1month ago it started really good now adays i need to pu him in semi 2 and run untill he starts...
What is semi 2???
Just a semiautomatic i need to put him in fitess 2 and run with it until it starts man so anoying before i just hit once my electricstart and it started.
@@georgethejungleboy186 So it won't start by hitting the button, however you can jump start it? Does it run good once started?
When it starts he does need to get warm else he just stops running so what i always do give alot of gass untill he gets warm then when i ride on it and i give max gas it like fires back so it goes from 45 tot 40 rlly anoying.
@@georgethejungleboy186 What year is this? Sounds like choke is not working?
is it a semi 3 speed ?
+Sam Liekens Yes.
MatthewMCRepair hey man I do really appreciate your advice on my honda about the valves. i did fix it and it works like new
No prob!
@@HTMR 4 or 2 stroke
@@jonneilsmyth9107 4 stroke
What's your audio/video equipment?
Nikon D3200 & Tascam DR-05. Also started editing in Adobe Premiere Elements. All this is new to me so it is a bit of a learning curve. BTW, I was using a Flip Ultra HD and windows movie maker for the past 3 years.
I'll post a video soon on the new equipment.
The Motion Pro 08-0015 is the WRONG tool for the 1968 - 1975 Honda Z50. The correct tool measures 20mm in between the prongs of the socket.
Do you happen to have that PN for the correct tool? I have a '74, thanks!
Motion Pro 08-0385. I used this on my 1973 Z50 without issue.
Do you yourself ride this bike?
+Atv Rider Yes. I'm 5'11" 170lbs and can also fit one of my kids on it a well.
always cutting
where did you buy your jis ??????
and you say that the jis is an impact aswell???
amzn.to/2qCbniV & amzn.to/2rfXLvM
Great vid man . Hey I have a question for all. I have an 82 z50r and engine shop told me the valves are shot ( the carb blows out for the 5 seconds we can get it to run)
Does anyone have any experience with those eBay Chinese complete heads ? I can't find an oem head . Any experience out there with those ?
Why don't you do a compression leak down test to see what the issue is? A valve job should not cost that much.
@@HTMR
The shop did that but I do not the results so idk . I will check into that bud thanks again .
It just odd cuz it runs fine for 5-10 seconds then just dies every time . I initially thought it was carb problems but when it's running there is air pushing OUT of the carb
@@xxDONMEGAxx Make sure the valves are adjusted properly.
@@HTMR So I was getting ready to remove the head , I had the exhaust off the head . Figured I would give it a shot to fire it up..... It purred like a kitten , so somehow the muffler was clogged that wouldn't allow it to run for more than a few seconds before .
Thanks for the vid and advice , really helped me out
That looks like a lifan 125cc
Is Japanese and Chinese math different?
Engine is OEM Honda.
👍🥰♥️
The bike is also known as Honda Monkey
No cut outs
You talk too much
Do you want me to teach you how to fast forward?