I see the butterfly valve on my carb is not dirty at all since fuel always
drip on it and get it wet. So carb cleaner for me is no fun since there is
nothing to be clean and even i spray on the carb hole, i feel no difference.
Perhaps its already clean. So buying a carb cleaner and did the job, the
return is zero satisfaction.
I dun know doin the below is right or not.
To clean off carbon inside combustion chamber, i asked my wife to rev up
the engine to 2k rpm, then i remove the hose from the PCV valve and spray
carb cleaner into the hose so that the cleaner could get right into the intake
manifold after the carb. What unexpected is, when i spray the cleaner in,
the engine will rev itself higher though my wife is holding the throttle constant
at 2k rpm. I tot the engine would sputter and wanna die, but instead it rev up,
this effect is totally unlike the when spray onto carb, the engine would sputter.
And one more thing i found out is, if u dun rev the engine and let it idle, taking
off the hose from the PCV valve would stall the engine, i think maybe due to
massive air leak, but instead if u remove the PCV valve from the valve cover
with the hose still attached, the engine would still idle due to there is still some
restriction in the PCV valve, not like a free flow and massive air leak alike.