YZ125 Part 17: 2 Stroke Power Valve Remove, Install, Teardown and Repair Powervalve
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- Опубліковано 30 вер 2024
- Part 17 of the new YZ125 series. We will eventually tear the whole bike down. May take some time waiting on parts and whatnot. Please subscribe and thanks for watching!
I have a 91 yz125 I'm rebuilding the top end when I got the head off there was rattling coming from my power valve I took the cover off and both top bolts were out of my power valve why/how did this happen an how can I keep it from happening again
two videos in one day, too good
hey johnny, i have a 94 yz125 and when i removed the power valve cover, the whole assembly was coated in in oil, im not exaggerating.. everything was layered in oil..what happened?
I know this is old but are u still on here I have a question
I enjoy watching your videos .... excellent and a lot can be learned from it! Thank you for that and keep shooting, I see! Greetings from Croatia!
Hey whats up love your videos..
I took apart my powervalve and it had all this black goop in their and the valves where sticky as hell, so I cleaned it all up and when I re-assembled it, the rod has lateral play in it, like I can move it sideways just a little, but enough that the springs get out of the grooves on the valves. Is this normal? It's a 99 YZ 125
another good video. no you can take your cylinder off. I was replacing my valve springs today and I polished up the covor for the front and side. it looks very cool on a brand new plated head and cylinder. you should try it!
Ok thanks, looking forward to the next video!
When I opened the power valve they were disconnected. One of the rods is longer then the other. Is the valve and rod all one piece?
i have oil dripping from my exhaust and from the power valve tube not a lot on the tube but i notice smoke is this from running the bike to rich, using bad gas or oil or just the power valves need to be cleaned
you think you can make a video about the seal for the power value
Great video, as a new owner of a '98 YZ125 I'm really enjoying your channel. Quick question, I've got a small oil leak, or shouldn't say leak but oil is coming out of this power valve drain, any idea what it could be, or what I need to do to it? or is it normal? Tnx a lot.
on my 91 rm 125 is the accuator suppose to spring back down when u lift up on it when theres no rod connected to it and is there suppose to be play in the accuator. the accuator springs back to position wen i pull down on it plz respond
does the cylinder have to be attached to the bottom end to do this or can I do it with the cylinder off. because I don't plan on taking the whole engine and. I know its a stupid question but I'm just want to know before I do it
explain to me how the accuator works plz. mine only spring backup wen i press down on it wen i press up on it it stays up. but theres no rod conneted to it yet on my 1991 rm125
Do you know if the Power valves are year specific? I need a new power valve for a 1999 yz125. I've found power valves for 1996-98, would those work on my '99? Thanks!!
I'm pretty sure they are :(
I have the same problem, how did you fix that?
do you need a spacing tool when you tightening the linkage
i have a 2001 yz250 do you think its similar to this 125? and could i do it while the motor is still in the bike? thanks good vid!
you could transfer the parts over if you want too. its best to buy a new one.
Thank you sir! Just saved me 25$ don't have to pay the replating company to do it.
+Ian Turney Cool!
but i think thats why 2stork burn more fuel......compared to the 4storke.
I have a question. I have a 1999 yz 125 and me and my friend rebuilt the bottom and top end we are 15 and do not know everything but we do know quiet a bit about motors we had very little help on the rebuild but on to the question. I bought a new cylinder for the bike and when I went to put the power valves in the cylinder they didn't fit and there are only 3 bolt hole where on the valves there are 4, I was wondering if I could try to either seal the holes so I could ride it without power valve
Exhaust leek and its not slow but the transmission has something wrong with it I'm not sure i haven't been riding it and sorry about the comments I'm on my iPhone and I kept pressing the done button and I'm also going to get the right ones when I find some they are just to expensive for new ones
I may be purchasing a YZ125 soon, could I change the piston / rings without removing the engine? I'd assume so, seems like there's plenty of room, cheers.
Of drimmel the valves down so they could fit either way I really want to ride and have been waiting a long time. And you seem like a well educated and experience mechanic. Please tell me there is a solution because I can't afford new ones and I can't find any used ones on eBay! Also are there any year models that have the same style power valves so I could possibly look for them also?
Hey, im going to clean my powervalves in my rm 125. What should I use to clean them?
I took the cylinder head off and it was super clean the cylinder still has score marks on it. When i looked into the power valve those two little shafts that connect the power valves to the spring were disconnected and different sizes. Is one of them longer then the other and are those disconnect able?
i have a 1989 yz 125 i just bought for my son.the powervalve wasnt hooked up, the threads in the valves were stripped.so i got that fixed by taping it out, but when i hooked it up the arm dont move is there a way to check the govener.and what way or the vavles suppose to be i can not find anything on them.
Can you do this with engine in the frame?
hi there i have an rm 125 and im having issues with it, im pretty sure it because of the powervalve. would it be possible to clean the powervalve without disassembling the bike and do you need to drain transmission oil first?Also can you pull out and put it back in without having to re adjust it or will i have to get a mechanic to set it right? I'd appreciate it if you got back to me
Is this a Athena cylinder and if so what year?
hey i have an 01 yz125 and it seems to lack a little bottom end power. iv heard people talk about timing the power valves differently. is that a possibilty and if so how would i do that?
How did you remove the screw to free the shaft mine is not budging
Just with a socket.
Apologize for not bring clear on the question. I dropped one of the power valves on the concrete floor in my garage. It hit on the tip of the power valve and deformed the tip of the power valve slightly. So I am wondering if it can still be used.
Dropper power valve on the end that created a deformation on the end that is pointed(figures). I think is could file it to remove the small burr that the drop caused.
Do you think it would be safe to use? Or is the best thing to get another one?
Dude u freaking rock . Thanks for all the help
You're welcome, thanks for watching!
hi i was wondering if you could give me some advice so i have oil leaking down the right side of my yz125 2001 i have manged to research that its probably the oil seal in the power valve i was wondering if you could tell me or give me some advice on where the seal is and how to go about changing it
What year. I am having problems with my bike and a friend told me to check my power valves and i dont know if this is the same year.
+Eddie Adams i found out the problem. i ran it without the silencer and there was an insane difference. So i guess i just needed repacking. It was pretty bad.
on my cr125r the power valve broke basically at the lip part on the top.....would my bike still run fine without it and if so how bad would it affect it
what exactly does the powervalve do?
I ran the bike for about 15 mins, then a friend took it for another 15 min ride, when we park the bike noticed, oil dripping from the drain, and the entire swing arm and rear fender had oil splatter everywhere, not a crazy amount but enough to make us notice, still normal amount to come out, or what do you think could the issue be. Tnx.
Hello there...i just wanna know what the power valves do?....its that a turbo or somthing!. I dont know so much about mechanic. Thx
I cleaned up everything because of dust and sand, now im wondering what oil can i use? Engine oil? 2 stroke oil? whats best?
I'm doing the top end on my 05 yz125 and pulled the side cover off we're the power valve rod conects on and the rod has snapped and it's quite dry and almost rusty in there? Bike ran fine before
I have 99 yz125 and the Allen bold on the power valve shaft came out I reconnected it and it's smoking my question is that (is there two sides to the shaft that you can screw into ?) just want to make sure I put it back together right and when I mean it smokes it looks like I'm using a digger when I ride it
yeah, on my yz125 one power valve snapped in half and hitted piston, i need to change piston, piston ring, cylinder, both valves, piston rod, gaskets. It's a pretty big mess. NEW cylinder original by Yamaha from Japan costs 720€, its not that cheap at all.. but I fill fix that thanks for the vid it helped me! :)
Hey man i have a 2001 yz125 and i just got my cylinder head refurbished. The company that did the job did some kind of treatment to the outside of the cylinder and inside on the powervalve housing. Does it need to be clean metal on the housing itself? I have some pictures ir you want to take a look at it. Nice videos btw
That hose that comes from the powervalve was leaking a little bit of oil and I don't know why?
I installed power valves backwards a few years ago. Definitely shredded my ring.
Good video 👍🏻
We tried it a few days ago because I figured I wouldn't be able to
Fogger sorry
Dang it anyway we tried it and it stopped most of the exhaust
how much space is supposed to be between the power valve and the cylinder wall?
What if you machined some rings to fit on the powevalve?
Sorry about that comment we tried it a
I'm trying to figure out where the hose on the side leads to. Is it just a over flow type thing? Idk what to call it.
Daniel Rosche Yeah, just hangs down
+jonnysshop thanks man I kinda felt stupid sitting there trying to look for where it goes. Oh well can't remember everything after a complete tear down.
Daniel Rosche Oh I'm with ya, that's why I started taping everything really!
thanks
Will a stuck powervalve cause a decrease in compression? My yz 125 runs fine but has barely any compression???
It could but 125's are pretty easy to turn over regardless.
it boost bottom end an smooths out the mid hit
Great video and does anyone know why i have to feather the gas to get the power band to kick in on my 1987 rm125. Someone said it was normal on older bikes but another said its not
Eduardo Ortiz Have you cleaned the power valve?
I just pulled my motor and plan to but i stripped bolt
Where does the shaft go to and if it broke where would it have gone
I have a 07 rm125 I recently did a top end and my power valves don't seem to open up when reving and riding. With the cover off on the rod I can see the rod barely move up when in neutral and doesn't move at all when in gear. My bike is super slow. I never took the valves out to clean them just whipped the oil out and put the cover back on. I'm worried if I may have tightened the rod too tight when I installed everything. Went back to loosen the screw and still bad. Please help
Pull them and clean them, most likely stuck open .
what did you use to clean the power valve?
great video man, just wondering what you cleaned it with? Is carb cleaner Ok?
Yeah, carb cleaner will be fine. I used this as well.
Ik I'm late but what year is that its literally the same design as mine
What does the power valve do?
ok thanx
What does a powervalve do?
Handy vids very cool
hey man i rebuilt a top end in one of these but after running the bike it doesnt seem like it has the power it should. I think the power valve isnt working like it should.would that cause it to be weak? when i was re installing the power valve the springs seemed like they were loose on the power valve. could it be that its too loose to open the power valve all the way and it cant kick into the power band?
Yeah, it sounds like you're onto something. My first guess would be the power valve and also check out the reeds.
96 not 91
great video ;)
Thanks!
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***** You're welcome!
thanks man your video is tons of help! never new it was so simple!
What do you use to clean out the power valve? My exhaust port is leaking oil and if I need to put on a new top end I might as well clean the power valve also
Odorless mineral spirits cuts it right off .
so does the beveled edge on the power valve face down toward the ground? or does the flat side face down? thanks
It should really only go in one way.
Mine broke and was bouncing off my piston till she had no compression
Yikes!
My power valve is very stiff i cant move any of it, Do you know whats wrong?
Stiff while connected or stiff in the sleeve it slides into? They could be bent but while connected to the rod they are usually a bit stiff.
Is it normal for there to be dark black oil coming out of the tube on the cover?
Yeah, it gets pretty cruddy in there.
Isn't there an oil seal on that rod to stop spooge dribbling out into the push rod area?
Yeah but this is pretty normal spooge in a power valve.
i need help ok the power valve cover has a hose hook up on that what hooks up to it
It's probably the breather hose. If so, it just hangs there..
Cool video ill be trying this tomorrow.
Thanks for watching!
Why not clean all that mess before installing the cylinder ? Kinda workin backwards . Oderless mineral spirits cleans all this stuff up easily . Nice videos always like to see how others work :)
+Beau 88 You could, not sure why I didn't... Thanks for watching!
***** not to sound like a smartass , i love to watch how everyone else builds these engines , maybe i'm ocd but i have to have everything surgecaly clean before reassembly . I wouldn't want all that debris falling back into a new cylinder . Great video series thanks for posting . Helps young kids get their hands dirty , i'f you own a bike you should be able to maintain it .
+Beau 88 Not taken that way at all. If this weren't a cheapo I probably would have been a bit more careful. Or maybe not :) I agree, so many out there just give up once one thing goes wrong..
hey brother do you have a video from start to finish with a better view on cleaning the power valves? if so please direct me so I can watch. just recently bought an 03 yz 125 and want to make sure to be able to get the best performance
If I get my hands on another 125 I will do it!
is there a certain way to set the power valves when you attach the actuator arm? my yz125 bogs at powerband after a top end rebuild and it didn't befor lol
also need help with this, just replaced a gear shift shaft, now after putting it all back together powervalve is not working
Hmm.. No, the only go in one way. This may be a silly question but did you make sure you put the piston in the right way? I've done it before...
Hmm.. A gear shift shaft wouldn't affect the power valve.
Hi, great video just wondering roughly how tight do you tighten the push rod on the right hand side? ( powervalve push rod) thanks!
I think it's 7 ft/lb.
What year is this yz125?
99
***** i love coming to these videos when i need help on my yz same year too. thanks for the great tutorials!
HortoniZPro Thanks for watching!
When you install them, do you need to pre-oil all the parts in there? Also, do you have to set them or anything? or is it just a direct bolt in?
Really shouldn't need to do much pre-oil but I always smear a little motor oil on them. Nothing to set really, just slap it in the same way it came off.
Wait can a 2 stroke have both a reed cage and power valves yes?
Yes
lee Isaac It could need a good cleaning and a bad fuel mixture. Could be a number of things but I would check there first.
yeah the oil is passing the rings
what seal?
What year yz is this please?
98
Johnnysshop thanks. Do you know how much of this engine is different to the 91?
Very good vids again i just want to let you know that you have taught me more about my bike that i did not know thanks
Thanks, I appreciate you watching!
your videos are awsome keep up the good work man