1. Ollie

    Short screeching sound while idling that causes engine to stall (Hua Sheng 49cc)

    Hey guys and gals, I finally decided to get a 4-stroke after going through a few 2 stroke engines over many years. It's fantastic and I wish I had bought one sooner, but there is one problem: When the engine is idling, sometimes there is a short screeching sound which more often than not stalls...
  2. M

    Break In New 80cc break in weird noise + low performance?

    Hello all, So I am relatively new to the MB scene and to this forum but everyone here has been a great help. So I bought a new 80cc engine off eBay (just a basic kit engine). I know these engines require a break in period but i have a few questions. Here are my specs. 100:1 Opti2 C Clip is in...
  3. C

    Strange noise preventing power

    Really scratching my head,when pulling the throttle to speed up I get to about 22mph and the normal whine the engine makes turns into what I can only describe as a air flapping very fast noise,it jumps between this and the normal whine of the engine speeding up noise every few seconds! I'm...