Added reply in a thread How bout Ryno in the 125 class 8/21/2018 6:30 AM

Someone protested and he told them it was a 150.

Added reply in a thread 2008 YZ125 Break up at top 8/19/2018 6:00 AM

Update: Looks like it was the power valve shaft seal. Replaced it. Friday and yesterday at Budds my son was hammering it. No break up. During practice yesterday it broke a little. 1/2 turn on air screw cleared that. THANK YOU ALL!!

Added reply in a thread 125 All Star results from Budds Creek. 8/18/2018 9:30 PM

He admitted to cheating. They shouldn't let him run the last race.

Added reply in a thread 2008 YZ125 Break up at top 8/10/2018 5:46 PM

Matt, It i escaping through the seal for the power valve shaft. I was forward thinking and ordered them along with crank seals. Arrived today. Will replace in the am. The air pressure bleeds off immediately. seal behind flywheel is good. Frustrating ... more »

Added reply in a thread 2008 YZ125 Break up at top 8/10/2018 10:26 AM

Update: rigged an air source to do leak down. seems like all air is out through power valve.Plug the hose but seems to bypass seal. Pressure drops right down. Make sense that power valve seal would do this?

Added reply in a thread 2008 YZ125 Break up at top 8/7/2018 3:55 PM

Matt, That is my plan on Friday. My understanding is the power valve shouldn't pass air so is it necessary to block the vent tube?

Added reply in a thread 2008 YZ125 Break up at top 8/6/2018 4:54 AM

So I am going to do a leak down to check. Quick question, is it best to do the test inputting air through the plug hole or intake?

Added reply in a thread 2008 YZ125 Break up at top 8/6/2018 12:56 AM

Matt, How did you find the leak on your son? Sandman, Breaks up either on the stand or when being ridden. Pulled the reeds last night. Excessive gas in the intake area.

Added reply in a thread 2008 YZ125 Break up at top 8/4/2018 7:30 PM

Paw, Where should I look? Been over it twice

Started new thread 2008 YZ125 Break up at top 8/4/2018 2:10 PM

Guys, HELP. 2008 YZ 125. Sounds crisp until you hold it wide then it breaks up. I rebuilt carb with stock jets. Bike is stock. Put in new crank seals, new top end. TILL happening. Carb has all new float, jets, seat etc.. Measured fuel level. My gut tells ... more »

This forum thread has 21 replies

Added reply in a thread 08 YZ 125 Timing 6/26/2018 7:51 AM

Chillrich, Paw Paw, Want to THANK YOU both for your help here. The explanations and diagrams were a great help. I'll let you know when it's all back together how it turns out.

Added reply in a thread 08 YZ 125 Timing 6/25/2018 7:11 AM

Paw Paw, I agree and that is how I will set it. Unfortunately the manual shows the mark on the flywheel should align with the mark on the stator and that misses by quite a bit. If you don't mind another quick question, while OHMing the coil. On the primary ... more »

Added reply in a thread 08 YZ 125 Timing 6/25/2018 5:15 AM

Paw, It does appear to you then that something is amiss with the manual? I will adjust the stator accordingly by the "trigger". Unfortunately I don't have access to another YZ to reference. Thank You

Added reply in a thread 08 YZ 125 Timing 6/25/2018 1:06 AM

It is an OEM crank. The key is indeed in. Just that flywheel isn't torqued in to spec so I can slip it off checking to make sure flywheel and crank have not mis-aligned. Where should "trigger" be when at correct timing? Just beginning to trigger or mid-point

... more »
Added reply in a thread 08 YZ 125 Timing 6/24/2018 3:37 PM

Added reply in a thread 08 YZ 125 Timing 6/24/2018 3:32 PM

Paw, I have the flywheel off,Eyeballing the key way and groove in flywheel to be sure. I just put it at TDC. The flywheel mark is 1 1/2 inches to the left of stator mark. Took a picture but not sure how to upload here.

Added reply in a thread 08 YZ 125 Timing 6/24/2018 3:09 PM

Thanks for posting that. So I found TDC spinning it counter clockwise. Then clockwise 19 increments. Still off about 1 1/2 inches from the mark. Doesn't make sense.

Started new thread 08 YZ 125 Timing 6/24/2018 10:33 AM

Sow while troubleshooting a bogging condition I decided to check the crank seals (will just change since I'm in there). I loosely decided to check the timing. Following the manual and using a dial indicator it just doesn't align. Not close.. It states ... more »

This forum thread has 19 replies

Added reply in a thread What happened to the Hondas ? 6/18/2018 5:14 PM

So you missed the flames out the exhaust? Happened in front of us. Yes, believe it or not no smoke but flames.

Added reply in a thread 08 YZ 125 3/4 to FT won't rev out. 6/18/2018 5:07 PM

I don't but i'm going to clean off the contacts on the coil and ground and see if the reading changes.