Ideas?

[Smokin'Gun]

I got my YZ125 out today and started riding it up and down my road and my friends were walking down and one of them wanted to ride my bike. He has a KTM 250SX so I figured why not. He took off and it seemed like he was over-revving the bike a little bit so when he came back by I kicked him off it. The bike was smoking more than usual and it smelled really really wierd. I kicked it over a few times and it still has compression and it still runs. I took the plug out and it is the color it is supposed to be and there aren't any metal chips on it. I cant say I've ever blown a top end in anything I've owned because I'm someone thats really big on preventative maintainence and I don't rev my bike out to its limits. What do you guys think that smell was and why the bike was smoking more than usual?

[zillaguy89]

hmm....I'm no expert, but just an idea...maybe you (he) chipped a reed and the funny smell and smoke is the motor burning that little chunk of carbon-fiber. I've heard that breaking a carbon fiber reed won't hurt your engine internally cause it just burns up and is gone rather quickly. just what I've heard though. My buddy has a 97 WR250 andhe had a similar problem. Bike ran fine until the chipped reed came totally apart, then no more run. Just an idea though

[fasterblaster870]

it could have been slightly loaded up and since you said you dont rev it out he may have just blown the engine out for ya...proly some carbon and such around the exhaust manifold. if you still have compression and ur plug looks good then ur engine is good but like that other guy said you can always pull ur reed cage out and take a look at it......if your throttle responce is good i highly doubt there is anything a matter with the reeds. and oh....never let someone else on ur machine....thats rule #1 lol.

[370banshee]

theres probaly nothing wrong with it. damn a dirt bike on teh concrete you must like buying back tires.

[terboed]

870 is right never let some one other than yourself ride your bike. i dont know about you but i dont have insurence on my bike and let (he took it whithout my permition when i was gearing up) my buddy ride my 97 cr250 and he cold sezed it. it needed a new piston, rod, crank, bairings, and bore. and he said it wasent his falt!!! anyway you might of blown your head gasket. my bro did that on his 98 cr125.

[Smokin'Gun]

nah 370 i live on a dirt road and noone cares if i drag up and down it. The kid that i let ride it was the previous owner of the bike and hes a moto-cross racer and hes 3 years younger than me and he knows that i would make him pay for anything if he broke it. He hasnet ridden a 2-stroke bike in almost a year so i think he was a bit rusty. I have no idea what the problem was with it but im thinking that maybe the carb had oil buildup in it or the powervalves were a bit clogged. The bike runs really rich on castor 927 oil so maybe thats the problem.