Quote:
Originally Posted by ragtopdodge
This happened to me too! My Il Bello (150cc) had about 2500 miles on it. Ran great!
This totally sux.
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Ah, ye olde holy piston! Any time I've ever heard of this, it's been due to running lean. Possible reasons for lean condition: air leak, incorrect jetting, vacuum operated petcock for the fuel supply. At high RPMs, vacuum petcocks may not react quickly enough, starving the carb for gas and throwing your air/fuel ratio off. Older Urals are (in)famous for it.
(You may notice I reference Urals a lot. They require a lot of tinkering, so it's the bike I have the most mechanical experience with!
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