Question about 2004 Suzuki RM 250

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Engine is making a buzzing noise

My engine on my rm250 2 stroke is making a buzzing noise, checked the oil plenty of oil. took the carberator off because the float was sticking and when i put it back on it started to make a buzzing noise.

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Hi mate
I'm no professional but when was the bike last rebuilt? it could be piston slap!?! I think this is when the piston wears too much and moves side to side in the barrel. try taking the spark plug out and gently turning it over you should be able to hear a knock as the piston goes up and when it comes down again.
Another method is when its running put a screwdriver on the barrel and put your ear to the other end, sounds mad but you can hear all the little knocks!
I hope this helps a bit good luck James

Posted on Jul 04, 2010

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