Hi all! tell how long should be the spring on the diaphragm in the carburetor! PC-25!I do not know what to do already!the sudden opening of the throttle failure, motorcycle jerks(Sorry, I'm from Ukraine)

 

Have the carburetors been balanced? Are all 4 springs the same length? Have the carbs been cleaned?

 

All four springs of the same length! synchronized and cleaned, I am two years nothing I can do about it

 

How do the spring to ride a motorcycle?

 

Help help help

 

Valve adjustment is the only thing that comes to mind if the carbs are already tuned. But it sounds like they are not synced properly. If it stumbles and hesitates when you whack the throttle, it's most likely synchronization. I can't think of anything else. Check your Air fuel ratio?