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Old 08-13-2014, 09:01 PM   #19
Swordsman   Swordsman is offline
 
Join Date: Mar 2013
Posts: 40
Quote:
Originally Posted by ragtopdodge View Post
This happened to me too! My Il Bello (150cc) had about 2500 miles on it. Ran great!

This totally sux.

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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