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| Mechanics Corner Looking for answers to mechanical questions? Just can't get it to run right? Got a tip for increasing HP? This is your forum! |
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05-10-2004, 05:00 PM
| #1 (permalink) |
| Newbie Join Date: May 2004
Posts: 2
|  2001 RM 250 eating up piston rings... HELP!!!
I bought a used 2001 RM 250 with pipe, renthals, graphics, etc. I love the bike. However, the second time I rode it I heard a metal sound in the engine, then it just stalled, and when I tried to kick it there was no compression and then it froze. I took apart the top end and it was TORE UP. The top piston ring had been clipped off into a few pieces, and it was pieces of ring that was making that metal sound that I was hearing in my engine. What made me stall was that piece finally flattened my spark plug gap, and when it froze, pieces of the ring were preventing the cylinder from moving. I completely tore the top end apart (what a mess), and completely built it new with a buddy who knows a lot about 2-stroke bikes. I was almost happy because I bought the bike used, and at least now I know that the motor was built right (if that was the problem last time.) I rode it twice and the SAME exact thing happened!! I just tore it apart again, and the piston looked frighteningly similar to the other piston. The top ring (only the top ring), cut into 3 pieces and found in the pipe/cylinder. When I put it back together the first time, me and my buddy were wondering if the powervalve had sluffed off pieces of the ring, but the mechanic didn't pay much attention, just had it resleeved. And since the EXACT same thing has happened to it, the only thing I can think is that it's the powervalve getting in the way of a ring. It's the only thing I can think of. It also seems like it's the exhaust side of the piston ring that goes first. Someone said that it might be detonating and just to run higher octane gas, but I don't want to put it back together just to find out that wasn't the problem. I have some seriously close up pictures of the ring/piston head and the cylinder wall by the powervalve, and it almost looks like there's a little of th e powervalve shinier than the rest (from hitting the ring and doing the damage?) I can e-mail pics to whoever can help. If so, is there any way to make sure the powervalve isn't loose in there? (So that it looks good and out of the way when you put it back together, only to get in the way under a load?) It seems like the simplest problem but it's becoming a nightmare! Help Anyone!!! Thanks!! --James |
