[SOLVED!] HS 142F leaking gas from carb overflow tube and air filter

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Feb 17, 2018
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#1
I built a motored bike in the spring. I put a few miles on it and everything seemed fine. Then I put it in storage.

Today I put a larger fuel tank on it and gassed it up. Gas leaks out of the air filter and out of the tube that is above the fuel line.

What did I break and how do I fix it?!

Thank you for your help.
 


MotorBicycleRacing

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#2
Your carb is not leaking!
It is overflowing because the float is not shutting off the gas gravity feeding into the float bowl.

Clean the carb needle valve.
I doubt if the float has gas in it making it a sink.
Do you use an inline fuel filter?

putring that carb in storage without draining the gas will also plug it up.
 
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#3
Your carb is not leaking!
It is overflowing because the float is not shutting off the gas gravity feeding into the float bowl.

Clean the carb needle valve.
I doubt if the float has gas in it making it a sink.
Do you use an inline fuel filter?

putring that carb in storage without draining the gas will also plug it up.
I do use an inline filter (brand new).
I did put it in storage for ~6 months without draining the gas. :(

Thank you very much! I will search the forums on how to clean the carb needle valve.
Thanks again!
 

MotorBicycleRacing

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#4
Remove the float bowl.
The arm on the float raises the needle valve into the seat to shut off the flow.
I think that needle valve has a rubber tip.

Sometimes tapping the carb will fix the overflowing.
Any debris in the seat will make it overflow.
 
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#5
Remove the float bowl.
The arm on the float raises the needle valve into the seat to shut off the flow.
I think that needle valve has a rubber tip.

Sometimes tapping the carb will fix the overflowing.
Any debris in the seat will make it overflow.
Thank you.
I did try lots of tapping.
I know I can take just the bowl off, with a 10mm wrench.
But will it be easier if I take the whole carb off?
And if so, do I need a new gasket when I reinstall the carb?

Many thanks.
 
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#9
Thanks for your help! I was able to remove the bowl without removing the air filter or carb. It looked clean, but I cleaned it with carb cleaner and a cotton rag anyway, and sprayed carb cleaner up where the needle seats, and more carb cleaner down the overflow tube. It took a while to get it started again but I think they may have just been air in the system.

I finally got it started and idling well, but noticed a little drip from the bowl. I snugged the 10mm bolt on the bowl down tighter, and I'll return to this project tomorrow. Hopefully I didn't f*** up the o-ring on the bowl.

Thanks again!
 

darwin

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#10
Don't tighten that 10mm bolt on the bottom too tight, snug is good, you can distort the bowl. Make sure the gasket on the bolt is good to go too.
 
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#11
Okay it's all good now! To any newbies who end up here: when you put the bowl back on, double check that it's on straight. Mine felt like it was on straight, but there was a gap on one side. I removed and replaced it, this time checking from all sides to make sure it was on straight with no gaps, and now it appears to be leak free.
 

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