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What does it mean if a black object came flying out of my 2003 RM250 pipe and before it came out it wasn't hitting power-band?



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Sounds like it could be the baffle or the spark arrester if it was the baffle it should hit the power band now I bet. The spark arrester you can run without this but if you ride in the bush and other dry areas it is wise to put it back in. Forest fires are a real danger and can spoil good riding areas if you are not careful. The baffle part I would remove the pipe to see if it has a build up of oil in it and let it drain out if it does the restriction in the air flow caused by the pipe being plugged will definitly keep the engine from getting to that sweet area called the power band.