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my 02 rm250

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took my 02 rm250 to the local track again today, runing great all day. Untill

all of a sudden out of no where, it started knocking/ ticking. I shut her down

as fast as i could, what happend? Engine was rebuilt last summer and has

been a very good dependable bike. Last i checked it had 135psi comp. May b

a wrist pin came loose.

All though i was pissed off,because i cant ride it anymore this summer. I was

also happy it wasnt my 4 stroke. Witch would take a small loan to rebuild the

450 comparied to the 250 2t. I guess ill find out when i take her apart.:D

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No way to tell for sure until you tear it apart but if it wasn't smoking it was probably in the top end. Gotta love the 2 stroke, jacked up top end (200 bucks).

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so i took my top end apart today. It looks like the top piston ring hit the exhaust valve and pushed ring up into the piston. The cylinder looks good, and i think i will be able to get by with a fresh hone and fresh piston. My question is how does this happen? ring gap not set right? The thing is that i have a least 10-15 hours on it after the last time i had it rebuilt. Any help would be great. thanks

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this may start a whole other discussion, but what is your mixing ratio and what oil are you using?

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It's getting colder out, and bikes are running leaner. Your bike was probably running a little lean, and you didn't even know it. Running lean causes more heat, especially in the area of the exhaust. 10-15 hrs on that piston indicates everything else was fine. No big deal, poop happens!

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killerdwarf77 i think u are 100 % right, i never even gave it a thought untill know. It had to be running lean. Its jetted for summer not 50 to 60 degrees. I feal like a dumb ass, i should have rejeted it for the cooler temps i was riding in. Live in learn i guess! As long as i cylinder is ok, and it can be honed again ill be happy.

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like what ? Out of no where it closed to far or what? Even if it didnt work i shouldnt get in the way of the piston. The bike ran great all day, i went around a corner and let off the throttle to slow down for the next one, and it started knocking.

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Sometimes the parts where enough for the main valve to go a little too far into the cylinder and catch your rings.

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ya that might be what happend, so what do i need to do? make sure valve is set the correct way? I do know that i was running to lean for sure, i never rejeted for the cooler temps. plug shows running lean also.

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Well, it's been almost 2 weeks. Did you figure out what it was?

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Well, it's been almost 2 weeks. Did you figure out what it was?

? did u read ? ring hit the exhaust valve, i just took her apart today. Just dont know if it was the valve that caused it or from running to lean.

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My service manual says something about checking valve to cylinder clearance. I'll look into it and tell you what it should be, but I have a 1998.

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