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Do I need a fuel outlet on the underside of the carburetor on my Honda engine ? Answered

the bottom of the carburetor on my motorbike-now-go kart engine has a fuel outlet with a needle pin for adjustment. can this be blocked up?....is it needed to make the engine work? or does it need as fuel pipe to connect to somewhere?obviously the fuel inlet comes into the carb from the top but this hole comes out the opposite side on the bottom.

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N13

3 years ago

yeah thanks guys thats great....my dad thought it might be a drain or something....as its piddling with fuel when i fill up the tank does this mean that the screw threaded needle pin just above it has lost its seal? this needs to be replaced?does it?

for the other guys....i didn't literally mean that it should be blocked up because it is useless in the first place but because i am changing the engine from a Honda motorbike to a go kart there are some things that can be left out for it still to be functional.

look forward to hearing from you

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Downunder35mN13

Answer 3 years ago

If it is leaking from there it usually is your needle valve failing (the one connected to the float).
Some have a black rubber seal on them, you can try to put these into boiling water for a few minutes.
It will soften the rubber and get it back to the old shape (or close to).
But
a seal kit including the needle valve is only a few bucks, so it might
be well worth it to refurbish the entire carby while on it.

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cerberustugowar

3 years ago

Is it located on the bottom of the carb bowl? Is it directly in the middle or off to one side a bit? Can you take a picture of it or maybe draw a picture?

By what you are describing, I would guess that it is the carb bowl drain. You use it to drain the carb bowl (obviously) when you are putting the motor away for storage or if you have let fuel sit in it for a month or more.

I would personally leave it there and operational. You could remove the hose if need be. That is as long as it is the carb bowl drain and not an atmospheric vent

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Downunder35m

3 years ago

It is an overflow in case the carby is blocked so the fuel can run out there instead of flooding your engine.
Also use to empty the carby for storage of the motor.
If you need to ask about the functions of carby parts you might want to look up some schematics about them.
Otherwise you might have a hard time tuning the engine.

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Wired_MistDownunder35m

Answer 3 years ago

Yeah more then likely a Return and/or Overflow Valve

But if it was there in the first place I'd plumb it just like it was in it's previous life.

(I Doubt an Engineer would have gone to the trouble to put it there for S**t's and Giggles; not to mention the extra cost to build it that way)