Man your the best for posting this vid, I doing a top end job for my friend and noticed the hole in the power vavle where you put your screw driver in to remove the powervavle assembly, I thought that he was missing the part and cut a screw driver to make a dowel and lock tighted my home made dowel Into the hole thinking that the piece with the groves piveted on it , I started the bike and it not running right at all , now I now what I got to do to make her run good again , great post 1996 yz250 will run great again tommorrow after some tinkering
dude thanks for putting this up I have a 95 yz250 that i got as a project and i have been scratching my head on the power valve looks like i gotta order some stuff and do some fabrication.
Thank you. Restoring a 98 and my power valve leaked. I took it apart replaces the orients and seals and was unsure I had It right. I also learned how to tighten it correctly with that dowel pin hole.
Thanks for this video I just finished rebuilding my 94yz250 from bottom up... I had the bike apart for 4 years was looking for a video on how to connect the linkage and this popped up thanks again
Thanks man. That's the reason I made this vid. Once I figured out what I needed and what I couldn't order I knew someone else would be in the same boat someday. Thanks for watching!
Hi keith! I have question to you! Im rebuilding a 97' wr 250, and i disamble de ypvs and where you put allen i have a pin that doesnt let move easily the powe valve ...so if a take the pin out will affect in something ,its necesary that pin or i can pull it out and let the power valve whit it??? I will aprecciate an answer! Greetings from Chile!
thank you for the clear video. turns out my power valve someone left the tightening pin in for whatever reason and it broke off one of the ears on the fork. also my valve is actually broken in half and theres some shiny parts on the valve. piston is fine though and rings are intact so im a lucky man. i ordered new $200 valve and o rings and hopefully itll have power again. ive been fighting with this bike trying to figure out why it has no power. and this is probably why!
Thanks for watching! The power valve it self is two parts that have a long allen head bolt that holds them together. Not sure if that's what your referring to when you say it's broke. Good luck on the fix!
@@Keith1212 yea but also the pins that hold it in place aswell are all wallowed out to the point where one side has sharp metal and i just dont wanna risk it. I think the locating pins are neccesary
I'm pretty sure that the part(s) you say you cannot order as they are greyed out are available. Look on the cylinder / cyl head schematic rather than governor. The later bikes (96+) seem to be missing a cylinder head schematic so you might have to bring up a '95 or earlier to find this. The PV is largely the same from 89-98 with the exception of a few washers/rings. Yamaha part no 3JE1193701 for your home made spacer. Hope this helps, and please correct me if I am wrong
www.partzilla.com/parts/search/Yamaha/Motorcycle/1996/YZ250H1/GOVERNOR/parts.html You can't order the spacers that I made in the video, but everything else is here. Thanks for watching!
rocky mountain atv or bike bandit. I prefer rocky mountain atv though. Just look up your bike. Mine was Yamaha>1997>yz250. then click the box on the side that says governor. The part I think your referring to is part #1 on the schematic. Good luck hope this helps!
So if my power valve is leaking thick oil out of it, what part do you think it is? I heard something about the power valve shaft developing wear and not having a proper o-ring seal or something? Is that part hard to come by?
+LCH_Entertainment It will leak a bit of oil on the side with out the linkage. It even has a bolt in the cover to drain the excess. The other side that has the linkage won't leak as much but a tiny bit under normal riding. The oil keeps the power valve lubed and working properly. Now if you have a ton of very thick oil or sludge in there it needs to be cleaned out as it will slow the power valves movement. If you haven't replaced the O rings on either side then I would do that while giving it a good clean to get rid of any thick oil or sludge. Then lube it back up with pre mix and put it back together. Thanks for watching!
+Keith1212 Also you can order the O rings from places like partzilla, bike bandit, and rocky mountain atv websites. Just use there bike finder menu to put in your year make and model. Normally partzilla is the cheapest for OEM parts.
+LCH_Entertainment On the side with the cover that says "Yamaha" on it, there is a cover inside that cover with a gasket beneath, so a gasket for the outside cover and one for the inside cover. That side has direct access to the exhaust and Im guessing acts at abit of an expansion chamber, hence the drain bolt. The side with the linkage will have a very small o-ring inside the linkage, with a larger o ring, and then an oil seal at the very end. If its leaking bad then replace all of those.
my 93 yz125 power valve is the same and i realized the previous owner left the installation pin (the notch that holds the power valve from spinning) in there so does that mean ive been riding without hitting the actual powerband this whole time??
Extremely good video on the power valve. I run Castor 927 for my premix. 36/1 You can run at 40/1 Do you see all the carbon build up on his exhaust and top of his piston. If you run the 927 none of this will be there and your power valve will not have all the carbon build up on it just a heads up
Dude if it wasn’t for your video I would’ve never gotten this power valve back together properly I had the parts correct it’s just the spring thing I didn’t know you had to spread it open
i have a 96 yz250 and the power valve linkage will not move when it it running the valve moves smooth and there is still tension on the linkage but when it gets into the high rpm the linkage will not open the valve. any ideas?
+glenn mo Sounds like your YVPS Governor is maybe not working correctly. If there is no tension on the actuator arm then something is definitely wrong. Take off the right side engine cover and inspect the power valve governor.
+David Ray you may have let the dowel that holds the governor on in the bottom end get stuck. you would have to remove the clutch cover to see. This normally happens if you flex the linkage with out the governor flexing it due to engine rpm. I'd take the clutch cover off as i mention and be sure the dowel is in the proper position.
Be careful of levering the link arm up like that, it takes the spring tension off the governor ramp, and can let the drive pin drop out. Looking at how far the valve arm is dropping down, the closed stop - part of the bush assembly on the left side - is getting worn, and this lets the valve rotate further down and contact the piston. You need to check this between top end inspections.
+Brent Mutersbaugh Same shape as the outline you see in the video. Has four bolts and a gasket to hold it on. You can look up the scemetic of the bike and see the cover on bike bandits website. Just search the year make and model.
www.partzilla.com/parts/search/Yamaha/Motorcycle/1996/YZ250H1/GOVERNOR/parts.html ? Should be able to find everything here. Except the couple things that are grayed out. Thanks for watching!
Here's an ebay link with a couple used push rods if that's what you were needing. www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313.TR0.TRC0.H1.Xyz250+3SP-11990.TRS0&_nkw=yz250+3SP-11990&_sacat=0
I don't know the size for sure, chances are your not gonna find it at a local hardware store though. It's part #5 on this diagram. www.partzilla.com/parts/search/Yamaha/Motorcycle/1996/YZ250H1/GOVERNOR/parts.html Thanks for watching!
Hola cómo pondría apunto la válvula de escape de un Yamaha yz 250 93 por la pongo como la pone en el vidio y no abre xq primera sequedad rebulacionada pero en baja 2ya la abre la válvula un saludo
Some of the smaller pieces on the video not listed on partzilla I had to make. Pretty simple if you have a garage full of bits and bobs. Thanks for watching!
+Kevin Stearns It's all about the port timing on a 2 stroke exhaust. smaller port equals more power down low. Larger port means more power on the top end. And everything in between! With out the power valve you would have a lot of top end but no low down torque. You would have some but not as much as you could have.
+Brent Mutersbaugh There's one on ebay atm. On ebays page next to the search bar click advanced. Then on the page it opens on the left side click "by item number" and search for this number "111857418284". That's the same as the one for yz250.
750 ml as it states on the cover near the oil fill. Also there is an oil check bolt that you can remove and fill the oil till it drips out of the hole, replace the bolt when it does and your good to go. The oil check bolt is located on the same side as the oil fill on the bottom left of the crank case. It will be the only one with a washer on it. Thanks for watching!
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thanks for the reply brotha. I got the linkage welded to save time and money at a local muffler shop and now works like a charm.
Thanks for the video, it helped me out greatly. There is no information besides your video online on how to set it up. Keep up the good work dude!
+Joey Pongallo Also my 94 is pretty much the same setup. Besides the inner spacer you had to make. That isn't needed for the 94.
Man your the best for posting this vid, I doing a top end job for my friend and noticed the hole in the power vavle where you put your screw driver in to remove the powervavle assembly, I thought that he was missing the part and cut a screw driver to make a dowel and lock tighted my home made dowel Into the hole thinking that the piece with the groves piveted on it , I started the bike and it not running right at all , now I now what I got to do to make her run good again , great post 1996 yz250 will run great again tommorrow after some tinkering
Glad to hear this video helped you!
dude thanks for putting this up I have a 95 yz250 that i got as a project and i have been scratching my head on the power valve looks like i gotta order some stuff and do some fabrication.
Awesome video thanks a lot my power band wasn’t kicking in on my yz125 and that was lose so I put it tight and now she rips
Thank you. Restoring a 98 and my power valve leaked. I took it apart replaces the orients and seals and was unsure I had It right. I also learned how to tighten it correctly with that dowel pin hole.
+Sam Avola Awesome man glad it helped. Thanks for watching!
Thanks for this video I just finished rebuilding my 94yz250 from bottom up... I had the bike apart for 4 years was looking for a video on how to connect the linkage and this popped up thanks again
Thanks for watching!
so is the '94 the same valve and linkage as the '97
i just noticed im missing some bits
@@foxeye1299 no because they are different jug set up for the power valve
@@foxeye1299 the jug may fit the bottom end or whatever but.... You need the innards for that jug
Same Engine as mine. I did this today, and thanks to this video, the piston might not be smelted cheese ;)
that's awesome man! thanks for watching!
Where did you order that piece that slides on the end of the power valve I can't find one anywhere
Nice it’s the same on my 1989 yz250 I was lucky enough to have all the little pieces
Needed this lol thanks man
thanks bro i got a 96 yz250 and im 13 so i did not know but you helped alot
Glad it helped! Throw up a vid of it on your channel sometime! Thanks for watching!
I need the thing that you had to buy on mine
thanks for your job. that video helped me a lot.
awesome video and bike bro. I got a 96 yz250 and im missing the same pieces.
Thanks man. That's the reason I made this vid. Once I figured out what I needed and what I couldn't order I knew someone else would be in the same boat someday. Thanks for watching!
Hi keith!
I have question to you!
Im rebuilding a 97' wr 250, and i disamble de ypvs and where you put allen i have a pin that doesnt let move easily the powe valve ...so if a take the pin out will affect in something ,its necesary that pin or i can pull it out and let the power valve whit it??? I will aprecciate an answer!
Greetings from Chile!
THANKS
thanks man
thank you for the clear video. turns out my power valve someone left the tightening pin in for whatever reason and it broke off one of the ears on the fork. also my valve is actually broken in half and theres some shiny parts on the valve. piston is fine though and rings are intact so im a lucky man. i ordered new $200 valve and o rings and hopefully itll have power again. ive been fighting with this bike trying to figure out why it has no power. and this is probably why!
Thanks for watching! The power valve it self is two parts that have a long allen head bolt that holds them together. Not sure if that's what your referring to when you say it's broke. Good luck on the fix!
@@Keith1212 yea but also the pins that hold it in place aswell are all wallowed out to the point where one side has sharp metal and i just dont wanna risk it. I think the locating pins are neccesary
When doing a leak down test I have air leaking out the left side cover of the power valve where there is a little cut out. How do I prevent this?
Thanks! I pulled mine apart today and all the pieces fell out i had no idea how it goes back
Can you replace the power valve seal while you have that off ??? Cause mine leaking Spoog out the bottom of my cover ?????
When the power valve is completely closed, the side ports aren’t completely closed off are they?
I'm pretty sure that the part(s) you say you cannot order as they are greyed out are available. Look on the cylinder / cyl head schematic rather than governor. The later bikes (96+) seem to be missing a cylinder head schematic so you might have to bring up a '95 or earlier to find this. The PV is largely the same from 89-98 with the exception of a few washers/rings.
Yamaha part no 3JE1193701 for your home made spacer.
Hope this helps, and please correct me if I am wrong
Does power valve give impact for emission?
Nice to know !
Thanks for watching!
Thank God....thank you !!!
Will a bike not start with powervalves disconnected?
Where can I find a spring for 1982 yz250
Great Vid! I was able to order all of the parts you showed! Im in NJ and Mt. Holly KTM ordered them for me
Gregory Thomas Glad it helped you! Thanks for watching!!
What's the bolt size n where could I go to replace one just like it?
Where did you get that first piece you was talking about? I can't find one anywhere
www.partzilla.com/parts/search/Yamaha/Motorcycle/1996/YZ250H1/GOVERNOR/parts.html You can't order the spacers that I made in the video, but everything else is here. Thanks for watching!
Preciso dessa Valvuka para uma yz250 1996, você tem?
Where did you get that part that slides on. The end of the power valve. I can't find it anywhere
rocky mountain atv or bike bandit. I prefer rocky mountain atv though. Just look up your bike. Mine was Yamaha>1997>yz250. then click the box on the side that says governor. The part I think your referring to is part #1 on the schematic. Good luck hope this helps!
if is liking no good ? I have the same motor whit same problem I buy the bike 2 week ago parts is spencers?
So if my power valve is leaking thick oil out of it, what part do you think it is? I heard something about the power valve shaft developing wear and not having a proper o-ring seal or something? Is that part hard to come by?
+LCH_Entertainment It will leak a bit of oil on the side with out the linkage. It even has a bolt in the cover to drain the excess. The other side that has the linkage won't leak as much but a tiny bit under normal riding. The oil keeps the power valve lubed and working properly. Now if you have a ton of very thick oil or sludge in there it needs to be cleaned out as it will slow the power valves movement. If you haven't replaced the O rings on either side then I would do that while giving it a good clean to get rid of any thick oil or sludge. Then lube it back up with pre mix and put it back together. Thanks for watching!
+Keith1212 Also you can order the O rings from places like partzilla, bike bandit, and rocky mountain atv websites. Just use there bike finder menu to put in your year make and model. Normally partzilla is the cheapest for OEM parts.
Thanks so much for the helpful response!
+LCH_Entertainment On the side with the cover that says "Yamaha" on it, there is a cover inside that cover with a gasket beneath, so a gasket for the outside cover and one for the inside cover. That side has direct access to the exhaust and Im guessing acts at abit of an expansion chamber, hence the drain bolt. The side with the linkage will have a very small o-ring inside the linkage, with a larger o ring, and then an oil seal at the very end. If its leaking bad then replace all of those.
Does anyone have the part number on that spring? The rest of the spacers I can make on my late but don’t have the spring
my 93 yz125 power valve is the same and i realized the previous owner left the installation pin (the notch that holds the power valve from spinning) in there so does that mean ive been riding without hitting the actual powerband this whole time??
+Zaanjo well there's only one way to find out! haha
Keith1212 yea, if only i didnt find out while my engine is off my bike and split apart for tranny problems lmao
You still operating on this channel? Id love to ask a few questions relating to the power valve where the two valve halfs meet. Hope to hear from you.
yes I am although I don't upload as much due to work. feel free to ask any questions you have
Anyone have any info on where I could get the spring?
Extremely good video on the power valve. I run Castor 927 for my premix. 36/1
You can run at 40/1
Do you see all the carbon build up on his exhaust and top of his piston. If you run the 927 none of this will be there and your power valve will not have all the carbon build up on it just a heads up
With 40:1 and 165 main as pro circuit recommend still runs very rich I use Lucas mines 97 Yz250
@@patbrooks4308
What carb do you have on the bike.
And I want you to ohm your coil it needs to be 13.5 to 14 ohm
Cap.need to be 5 to 6 or no good
Nice
Will the power valve work fine without that spring?
nope!
I can’t find the Power valve seal for my 97 yz250 just cover gasket
Where can I find the spring? Called parts place they say it’s discontinued. Do you know if there is another engine or year that will work?
did you look up the make model and year on partzillas website? Thanks for watching!
@@Keith1212 I got one for a later model and made it work. Thanks!
Dude if it wasn’t for your video I would’ve never gotten this power valve back together properly I had the parts correct it’s just the spring thing I didn’t know you had to spread it open
I'm glad the video helped you! Thanks for watching!
@Stay off my lawn Your welcome and thanks for watching!
my linkages is broke. I just rebuilt the clutch side. I just need to start temporarily. will it start with out the linkage ?
yes it will start, but it won't rev out properly on the high end. Thanks for watching!
i have a 96 yz250 and the power valve linkage will not move when it it running the valve moves smooth and there is still tension on the linkage but when it gets into the high rpm the linkage will not open the valve. any ideas?
+glenn mo Sounds like your YVPS Governor is maybe not working correctly. If there is no tension on the actuator arm then something is definitely wrong. Take off the right side engine cover and inspect the power valve governor.
I HAVE A 1997 YZ250 YAMAHA AND IM PUTTING NEW GASKETS ON TOPEND AND I GOT NEW OIL SEAL WERE DOES IT GO
I'm not sure the seal your refering to. If you wanna Pm me on here with a link to a pic I can take a look for you.
I was taking apart my power valve linkage on my 98 yz250 and pulled up on the linkage and now it's stuck in the highest position any thoughts?
+David Ray you may have let the dowel that holds the governor on in the bottom end get stuck. you would have to remove the clutch cover to see. This normally happens if you flex the linkage with out the governor flexing it due to engine rpm. I'd take the clutch cover off as i mention and be sure the dowel is in the proper position.
+Keith1212 thanks man I'll be sure to look into that
+Keith1212 hey I figured it out one of the balls in the governor wasn't in the star. Popped back in place works great now
great! glad you figured it out!
Thank you for the video helped a ton, but now I can't find anywhere to order the return spring...
This should have the parts your looking for. Thanks for watching!
www.partzilla.com/parts/search/Yamaha/Motorcycle/1996/YZ250H1/GOVERNOR/parts.html
O rings
Be careful of levering the link arm up like that, it takes the spring tension off the governor ramp, and can let the drive pin drop out.
Looking at how far the valve arm is dropping down, the closed stop - part of the bush assembly on the left side - is getting worn, and this lets the valve rotate further down and contact the piston. You need to check this between top end inspections.
Can anyone help with spacer ideas???
what does the cover look like
+Brent Mutersbaugh Same shape as the outline you see in the video. Has four bolts and a gasket to hold it on. You can look up the scemetic of the bike and see the cover on bike bandits website. Just search the year make and model.
Can someone please tell me where I can order the boss lever and spring ?
www.partzilla.com/parts/search/Yamaha/Motorcycle/1996/YZ250H1/GOVERNOR/parts.html ? Should be able to find everything here. Except the couple things that are grayed out. Thanks for watching!
Here's an ebay link with a couple used push rods if that's what you were needing. www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313.TR0.TRC0.H1.Xyz250+3SP-11990.TRS0&_nkw=yz250+3SP-11990&_sacat=0
Thank you so much you're a life saver I couldn't find the stuff anywhere
Where can you order the spring I can’t find it
You ever find a spring?
What size is the bolt my 92 is missing it? Good video helped out a lot btw
I don't know the size for sure, chances are your not gonna find it at a local hardware store though. It's part #5 on this diagram. www.partzilla.com/parts/search/Yamaha/Motorcycle/1996/YZ250H1/GOVERNOR/parts.html Thanks for watching!
Did you ever find out what size bolt you needed? Working on a 1990 yz250 and I'm pretty sure they're the same engine
Hola cómo pondría apunto la válvula de escape de un Yamaha yz 250 93 por la pongo como la pone en el vidio y no abre xq primera sequedad rebulacionada pero en baja 2ya la abre la válvula un saludo
How do you remove the powervalve?
Nw-lifecycle check his video out on complete rebuild on 94yz250
I fucking love you
im missing the exact same parts what are they called??
Some of the smaller pieces on the video not listed on partzilla I had to make. Pretty simple if you have a garage full of bits and bobs. Thanks for watching!
so its making the opening bigger for the exhaust. why not leave it out?
+Kevin Stearns It's all about the port timing on a 2 stroke exhaust. smaller port equals more power down low. Larger port means more power on the top end. And everything in between! With out the power valve you would have a lot of top end but no low down torque. You would have some but not as much as you could have.
+Keith1212 your right it has all top end. ill put them in and leave them pinned opened.im not hooking all that shit back up.
Some segments in the video are stamped not adjacent to each other
Does the cover have a gasket
yea it does
@@Keith1212 thanks
I LEARNED HOW TO TEAR APART AND PUT TOGHTHER ALMOST EVERYTHING ON MY BIKE JUST A FEW IM UNSURE
If there's any thing else I can help with let me know!
5 years too late, but you can order that spacer. It's in the Cylinder Head diagram part# 3JE-11937-01
Lol
1989-1990 ?
Sorry I missed this comment. I wouldn't be sure on those years, but If I had to guess there different. Thank you for watching.
i dont have a yz.
I broke my bolt off
I did not see a cover
+Brent Mutersbaugh There's one on ebay atm. On ebays page next to the search bar click advanced. Then on the page it opens on the left side click "by item number" and search for this number "111857418284". That's the same as the one for yz250.
How much oil does the gearbox hold?
750 ml as it states on the cover near the oil fill. Also there is an oil check bolt that you can remove and fill the oil till it drips out of the hole, replace the bolt when it does and your good to go. The oil check bolt is located on the same side as the oil fill on the bottom left of the crank case. It will be the only one with a washer on it. Thanks for watching!
Had brand new Boyesen covers after my rebuild. Now that I think of it the old covers never came back with my engine when,I had the rebuild done.
oh yea haha. That would have been some good $ if you got them back to go on ebay probably.