Originally Posted by
stefan
Sounds like your engine is too lean on the bottom. Open the low speed needle a quarter turn and try again.
HI Stefan,
Have already try that but the problem remain as it is

, just don't know how to deal with it, i have it set rich at LSN which Picco engine are used to be.
Could fuel or any factor like carburetor cause the problem? Does anyone has that problem as well?