The power valve shaft, #11 in the factory service manual, should have the retaining clip, #8, installed as soon as the shaft is put in. This will locate it precisely for the rest of the build. The fitment of the barrels was giving you issues as the shaft was sliding left and right which you kinda figured out at the end of the video. Also the crecent cut of the power valve shaft at the retainer should be to the upper right as you are looking at the retainer after it is installed. This will keep the cut out away as it is motion. Great video btw, really helped me!
@garrettfrank2242 Жыл бұрын
I watched the whole video to find this out
@timsoftsolutions5 жыл бұрын
Thank you so much. This video was super helpful. I am in the middle of rebuilding my YZ250 from the ground up. During the tear down, I broke the piece you mentioned that commonly breaks on this type of power valve. So I had to order a new one. They are not cheap...:-) Thanks for the tip on having the sub ports completely closed when tightening the 3 mm screws. This video was super helpful. Thanks again.
@jamesrivers68536 жыл бұрын
You know I've been doing this for a very long time absolutely one of the best videos I've seen out there good one on you mate
@graememcelligott88743 жыл бұрын
Very helpful thank you. I am just beginning a top end rebuild and hadn't realised the powervalve on the 250 is different from the 125.
@dylanmonnelly95392 жыл бұрын
U the man Dave. Thx lost track of the order of washers going back in I’m just happy I didn’t break anything and that I didn’t need to re Nickel sil plate my cylinder.
@pbyrne14007 жыл бұрын
Thanks Dave, very informative and interesting! Great work!
@agatarogacka52275 жыл бұрын
mega pomocny filmik przy składaniu zaworu wydechowego yz 250...dzięki kolego ... super interesujący materiał.
@zachkawaja15244 жыл бұрын
Such a helpful informative video, merry Christmas to you and your family! Thank you.
@KellerDidThat Жыл бұрын
Now that's proper tutorial! Thank you.
@misterblockbuster5696 жыл бұрын
Love the step by step thank you
@ericrogner2461 Жыл бұрын
Thanks good vid
@vinm3002 жыл бұрын
Very interesting. I thought it was cylindrical (Looking in when the exhausts are off). It always helps to know what shape things are.
@dennisgarryowen88856 жыл бұрын
Great Video. Thank you.
@rtillerypowersports2 жыл бұрын
Fantastic video. All the negative people leaving their 2 cents are ridiculous. Great job man.
@genemccreesh91694 жыл бұрын
Great video! Ty!
@straighttimestirrups3 жыл бұрын
Aside from the incorrect camera orientation, great video.
@RideWithTheWolf2 жыл бұрын
Your bench seems to be missing the oil seal. Thanks for the video.
@UNKLEWHEELIESON3 жыл бұрын
Excellent job
@suntzuwarsword19646 жыл бұрын
excellent..thank you
@jessicashelswell444 жыл бұрын
I noticed you said it doesn't matter which side the drums go in. Wouldn't be ideal to keep previously mated surfaces together unless you are replacing as a whole? Could you rotate the drums and use the the top surface where the forks would make less contact as fresh surface or are the drums directional, i.e have a top and bottom- clearly they slide into the cylinder one way. I'd imagine most the wear occurs at the fork pivot point, the fork its self and the pin the fork engages with in the groove of the drum. Awesome vid thanks
@tobylopez87054 жыл бұрын
So after it’s put back together, when you pull the valve open is it supposed to spring back closed On it’s own? Or does it not have any spring retention?
@cleanoutofit6 жыл бұрын
Good video
@teflon36don872 жыл бұрын
Well explained thank you
@chasespaugh61662 жыл бұрын
This was very helpful and led to me discovering that my transition thru no power valve actuation and full activation has a slight studder that seems like 1-2 rpm of hesitancy - do you have any idea how i can eliminate that hesitancy as it kicks in as i am hitting a jump face and is very alarming?
@rise2live5 жыл бұрын
I have a major question.. the ring that's used at the end of the long power valve rod.. is that seated to the 1st wider groove or the smaller deeper groove .
@johnwall654310 күн бұрын
Would this cause wide open throttle if broken?
@goodboyringo97164 жыл бұрын
Amazing someone could think this up and make it ........Why lock tite and to the job if the one part is broken , you'll just have to take it apart when the new part comes in?
@chilldbox3 жыл бұрын
Question. I have a yz250 new top and bottom rebuild. Power valve opens main valve but not the subs. If I turn by hand they all open, main first then subs. The linkage lifts enough to open the main when revving but stops too soon. Stock everything except fmf silencer. Power is great on the bottom and mid. Top feels like a 125cc
@geoffmcwiggan28145 ай бұрын
At what rpm point does the valve start to open.👍🥃🇦🇺
@justinpelkey11717 жыл бұрын
When you're using the pliers to open/close the powervalve.. is that under spring tension or could you very easily do that with your fingers as well? hopefully your answer solves the issues with my bike. Haha
@ReconRider3506 жыл бұрын
Justin Pelkey It's not under spring pressure but kinda hard to do with your fingers. Plyers make it easy.
@darrenbratby15586 жыл бұрын
Hi just a quick 1. The seal that u mention at 17:54 needs replacing on my bike, do i have to remove the pv shaft to replace it? I have a 2007 yz250
@xHEROx5 жыл бұрын
yes, you need to remove the shaft to replace that seal
@Sugarkryptonite6 жыл бұрын
Sorry if you mentioned in the video, Dave (didn't end up watching it all). Is this something that can be done with the engine still in the bike? I'm guessing the piston and everything can stay together while removing this?
@xHEROx5 жыл бұрын
its extremely difficult. stock cylinder will have phillips screws holding the cover on the PV, so you'd need needle nose vice grips to remove them in most cases (the PV cover sits too close to the frame/rads to get a screwdriver in there). then its a matter of "can I even see wtf I am doing?" Sure it can be done and has been done. but in an extra 15 mins you can have your cylinder off and not worry about the hassle of working in a confined space
@timpaukstis43243 жыл бұрын
This was also my question. Thank you sir. Great video. Much appreciated
@alfretamaalfretama28592 жыл бұрын
Ciao funziona con la testa della valvola rotta ?
@netz5553 жыл бұрын
That powervalve is broken... the stopper in the centervalve is broken and that is not something you ride with! Replace the center-valve with the one used in 99 to 01 bikes. Its a beefier valve that doesnt break like the 03 onwards does.
@hondaguy425able5 жыл бұрын
Do I have to remove the power valve to remove cylinder head?
@thibo21075 жыл бұрын
Edward Duran no just a litle arm on the left side
@tonewalljaxon70624 жыл бұрын
@@thibo2107 cylinder head only head bolts.....and stay....cylinder ...8mm bolt in arm.
@nicksainders56113 жыл бұрын
I found the same piece broken on mine ... are you able to run it with the broken stopper ? What does it do exactly
@mrblack34803 жыл бұрын
The 2 side cylinder don’t even move on mine
@1320fastback3 жыл бұрын
No Bueno
@itzkertmusic59075 жыл бұрын
I thought 2 strokes didn’t have valves don’t bash me because I’m new to dirt bikes
@hondaguy425able5 жыл бұрын
itzKert Music this ain't the kind of valve your thinking. This valve is more like the ones found in automatic transmissions.
@itzkertmusic59075 жыл бұрын
Edward Duran oooo thanks for letting me know very useful information 🙏💯
@tedpaszko82743 жыл бұрын
That's for exhaust Not not a piston valve like on a four stroke
@garydetaeye70814 жыл бұрын
you should not be having to do that if you payed a good company to redo you top end