Carby assy 
Dismantled carbys
Fuel pump diaphragm were stretched.
One way valve of fuel pump were squashed. This may cause to pumping problem of fuel as make fuel lean. 
LH original, RH improve parts as avoid to squash pump valve.
Rebuild with new kit, new valve & seat and new pump valve assy.We must do crabys service when rebuild motor. If carby has problem like a this case engine will not run well or damage engine again after rebuild motor.
