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Crf250 07

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Can anyone help just had 07 stripped for piston replacement and found one lobe on the cam closest to chain worn through hardning and bucket has worn concave bike has done 42hrs and has had oil change every 2.5 with filter..

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at 42 hours there should be almost no wear... And you are changing your oil every 2.5 hours, so I don't see why there would be the excess wear. What type of oil are you using? You should be using a high quality motorcycle specific oil... And if it was raced hard, I guess its time for a piston but generally for a bike that is ridden hard, the intervaul is 70 hours.

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