Kasey & Wolf, You beat me to it. Flywheel weights have been around for 20+ years with no ill effects. Woods and Enduro riders have been using them forever on 2 strokes and swear by them. Read any Dirt Rider or similar dirt bike related magazine and you will see ads for this type of product. I personally would not choose this type of mod. I would chose an appropriate tire & gearing combo as well as run a stock carb and a nice torque pipe.
Curtis
I love anything with an engine except a lawnmower...
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1986 Tecate and original owner of a 1985 200X.
3 wheeling since 1975.