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I'd say around 5k, power difference felt ALL around! Not a dramatic difference, BUT not a suddle difference either if that makes any sense. The gains arent felt off the line, but more when taking on headwinds, inclines, passing. Before... I sadly couldnt even pass a schoolbus letting me by.. literally! Now, its not so much an issue anymore, lol! I should also mention 57.4mm pistons appear to be common standard, one could easily have their existing jugs honed out for the larger pistons, no need for kit.

Is the 280cc kit still running good?
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