125-200cc 2009 WR125 Extreme lean condition

Thanks motosportz. I believe is the same as the yz.

Im pumped about doing this. Would you suggest i do the clutch side as well, or since it isnt leaking and using trans oil let it go?

This is new to me so not sure the common procedures.

Wow 5mm bigger thread on a 225cc lesser machine.
Follow kellys measurements mine was just from past exp on my 360.

If it aint broke dont fix it.
Theyre a bugger to get out in situ so just do air side for now.

Will do! I was hoping youd say that! Im good at leaving.thel alone!

Just make sure there is no up and down movement on the crankshaft that would indicate the main bearing(s) is/are about to fail. Up and down movement would cause the seal to prematurely fail but it is most likely old age and deterioration of the seal.

Noted. Thanks again,

Okay fellas,

Zero play at the flywheel. Popped the wheel off then the stator and the seal was loose.

Like fell into my hand. Popped a new seal in put it back together and seems to be solved.

The spring was separate from the seal any idess how a seal gets blown out like that? ?

improper installation at some point? either way, glad it should be fixed!

Backfire timing could be a bit off or crud could enter magneto side interfere with signal and mess timing up temporarly, had my bike running backwards once it was soooo wet the bike was jittery n pulsing allover the place pulled over trying to keep it reving to clear whatever it was held at 1/8 throttle till i thought was good let clutch out an whent backwards, killed bike immediatly and checked plug coil magneto cover was soaked full of water.
Drained that out and she ran fine.

Stator loose! Grab some thread loc on those screws before you forget about it.
Should be a factrory timing mark to get the timing it running, a bit of fine tuning may be required.

Bike performed awesome today rode at my favorite track with two good friends great day. Picked up a 93 pw80 Yamaha on the way down. It is a total throwback, purple seat, time capsule little bike. Totally mint, except been sitting for years. The carb was insanely nasty. Like bad, cleaned it track side, easily took an hour of three people spraying, scraping, and cleaning that filthy, carb.

The slide physically wouldnt budge, throttle wouldn't turn, all the jets were cloggled, bowl, body, everything was baaaaad. The brass on the adusters, and jets was worn and pitted from the fuel.

Got it running though, it runs pretty awesome honestly. Good day, sold that to my buddys girlfriend to learn on. Everyone's happy.

okay another update.

my cousin got a 2013 cr125/144. we switched bikes and his blows mine away. no surprise there, but just how much it does so is what surprised me. mine has seemed 'off' since i got it basically. its hard as can be to get into the power, mid-top it rips but its very boggy and hard to convince into the mid. it takes a ton of clutch work and revs. where his will pull a gear or even maybe 2 higher with less drama and much more explosive.

is that just a nature of it or do i have some tuning to do?

Get timing checked, and go from there.

timing was set at the factory marks when i did the crank seals.

the pv was adjusted with the nut towards the top of the lever. since no room to move the nut up i went down about 3/4. definitely lost some pull up top but the bottom perked up some. im going to move it back up in between where it was and where it is now get some top end back.

still much more boggy then i would imagine it should be.