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315 Wont Rev Out

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struggling to get bike to rev over id say about 2/3 of the rev range it feels like its holding back and spluttering slightly tried new plug cleaned carb altered clip position from 3rd still no better thinking maybe electrical cheers

I would check your reed valves for wear (frayed edges). My 315 ran similar to that back in the day when I had one. I replaced them twice over a nine year period of ownership. Admittedly I put a massive amount of miles on her.

Do you have an "R"  Resistor type plug installed?  Without a resistor plug it will act like it has an electrical problem.

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