Major Problem

[xXxYZxXx]

I posted this in another forum and no one was of any help, so I'm bringing it here. My 02 YZ 125 has been acting funny lately. There's a slight pinging coming from the engine I haven't noticed before, and whenever you let out the clutch from neutral into first, it has a serious loss of power, like it barely goes, then after a few seconds of holding the throttle wide open, it finally kicks in and the power is dead on, is keeps doing this everytime, even after filter cleans, jetting changes. I haven't really investigated anything else, and it's Prom weekend so I don't have much time. I was hoping you guys could help so maybe I could fix this at home and not have to take it to the shop, thanks.

 

[cr25096er]

check to see if the powervalve it operating, sounds like its stuck open.

 

[xXxYZxXx]

Sorry about the double post by the way, but when I check the powervalve should I check the push rods or the actual valves themselves for sticking, cuz I don't have the time to actually inspect each valve, but i can do the push rods in like 5 minutes

 

[cr25096er]

pull the left side powervalve cover off and see it it works while you run the bike, just rev it in neutral.

 

[whyzee]

Originally posted by xXxYZxXx
I posted this in another forum and no one was of any help...

Maybe ya just don't like the advice you're given. :think:

Anyway, if ya want to check the powervalve operation, remove the 4 bolts, pull the front plate above the pipe and check the valves for proper operation. You say it has 'small pinging in the engine' & 'slight pinging coming from the engine' that does not sound like a stuck power valve.

 

[rickyd]

Is there anyway that the stator may of moved?? When you say pinging and loss of power, thought of this.. Also, perhaps bad fuel??
Rick

 

[bnr]

Check your main jet. I had the same problem once. A piece of the oring (wrong size) from the bottom float bowl broke off and created a lean condition.

 

[xXxYZxXx]

Could getting a new topend help any, I haven't done a top end in awhile..it needs to be done anyway, but could that be part of the problem? Could the rings be worn and be causing some of the problem.