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    Best Out-tha-Box ported Hi-Perf Motor?

    This ole retread's been away from 2-strokes fer decades. I need a primer on a state-of-the-art bicycle two stroke motor. Searches revealed - lotsa hi-perf mods; carbs, pipes, DIY porting etc. Not much yet on the current crop of Out-of-Tha-Box Hi-Performance bike motors. I'm a bit rusty...