Engine runs good for first 4 minutes. Then boggs down and dies when I give it throttle to take off. Shut it off for a few (2) minutes and it will be OK for a few start offs the bogg down again. Removed exhaust; same thing. Removed air intake; same thing. Disassembled carburator and blew out all jets; same thing. Did visual and vacuum check of fuel flow vave on bottom of fuel tank; checked good. Que Passo?
SOURCE: fuel in the carb next to air screw
on old carbs they have mechanical fule pump. you may need to look into a new one or try pumping the gas a few times while turning it over.
and it means theres fule in the bottem of the carb.... the carb is an atomization chamber for fule. if you have to much fule (ie to rich) your going to have liquid fule at the bottem of the carb. this is bad, you need to lean out the carb bar turning the idle screws the right (12 o-clock to 9 o-clock...) just a bit at a time. and play with it while it's at idle to what you think is a good idea. you can hear it trust me just play around with it.
also look at the throttle advansment lever (it shoot gas in at wide open throttle as to not stall) its conected to your throttle cable.
AND YES IT IS.... your fule will evaporate and fast if don't.
SOURCE: my vespa et2 50cc will flood when sitting
It sounds like your floats sticking in the carb leaving it open all the time. take the carb to bits and clean it replacing all seals.
Testimonial: "I have rebuilt the carb and installed new float needle and seat The only thing I can think of is the vacuum fuel tap does not seal well causing fuel to flow overnight"
Engine stall or RPM fluctuates
at idle.
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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