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Yamaha blaster wont rev up sputters past 1/4 throttle

I have been trying to help a buddy out with his blaster it has a stock motor , air box delete just a filter off the intake, has a full fmf pipe and expansion chamber. ive alreadly done a dynojet carb kit with a 360 jet, ive tried multiple jets to see what would work no change in problem, ive replaced every part in the carb, deleted the oil injection and pre mixed fuel. and ive completey replaced carb with another one and still no change . also replaced plug

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  • Douglas Hansen
    Douglas Hansen Jul 10, 2010

    You don't mention what the problem is??????

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