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Old 01-29-2018, 02:38 PM
2trebel's Avatar
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Question 1997 RM250 Fuel dripping down cylinder


So I recently bought a 1997 RM250 for pretty cheap, the guy claimed it had a top to bottom rebuild. From what I can see the bottom looks to be done, but not the top.

Compression is good but I looked down the spark plug hole and see alot of carbon buildup on the top of the piston.

Anyway, the bike is extremely hard to start, cleaned the carb, checked the reeds, I have fuel and spark and this is the only thing I think it could be. I will provide a picture of what I mean but when i took the intake and reeds off and looked in the intake, I could see fuel dripping down the sides of the cylinder. Could it be blown rings/ old piston? I'm out of ideas..

Picture of the fuel dripping:

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Old 02-09-2018, 08:49 PM
Woody_393's Avatar
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That's interesting. I honestly don't know if that's good, but it does appear to have too much oil / gas in there.

It does run though?
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Old 02-13-2018, 09:51 AM
cowboyona426's Avatar
Join Date: Feb 2003
Last Online: Yesterday 10:53 AM
Location: Newport, WA, USA
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I don't think that much fuel in the cylinder is normal, it's probably flooded. Did you leave it parked with the fuel tap turned on?
Here's what I'd suggest- drain the tank and carb, clean out the carb one more time.
Remove the spark plug and kick the engine over 10-12 times.
If the plug is black, wet, or cruddy looking replace it.
Reinstall plug
Mix up fresh fuel
Pour a little fuel into the tank, then try to start it. If you kick for a while and start to smell fuel, it's flooding and you'll need to sort out if the issue is in the carb or somewhere else. My guess is that due to the fuel in the cylinder, the plug is wet or fouled and if the fuel was left on while the bike was sitting you may have fuel getting into the cases.
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