Carburetor is leaking gas out of overflow tube... I need help.

trupro

New Member
Joined
Jul 26, 2009
Messages
6
HI.

I cant post in the 2 stroke forum yet. So I will try here for now.
Here is my problem.

I bought a new engine off ebay. It is a slant head with the carburater that is mounted closer to the engine. (closer than the last engine I had)

But anyways,
I built the bike. I did put a fuel filter on it in line.
I also (before I started the engine for the first time)
Put a lid-full of 2 stroke oil in the hole where the spark plug goes.

(This was suggested in the operating manual online for "spooky sprocket" company.)

So, the bike will run (fairly well) for about 1 minute. Then it will stall.
It stalls ( I think) because I have the carburator gas flow button turned horizontally. But If I turne it vertically, gas steadily comes out of the tube.

I have tried to look at the the needle and the spring. But I dont know what to look for.

I also was going to take the carburator off. But one of the two nuts holding the carburator onto the engine is mounted flush to the air breather.

So there is no way I can get any tool around the edge of the nut to grip it out.

I really dont want to have to order another carb, since this is brand new.

Let me know if you can help me. I would be greatly appreciated!

Also..

the bike will run for about one minute... then it will idle real high for 2 seconds.. then it dies.

This first run today, it ran for a good 5 or 10 minutes without stalling.

Thanks for the help!
 


QuadManiac

Member
Joined
Aug 17, 2008
Messages
76
Inside the bowl on the bottom (held on by screws) there is a float pushing up on a small valve. That valve is not closing off the flow of fuel. Either the mating surfaces between the valve and it's seat are scored or corroded, or there is some piece of debris preventing the full closure. Look at both the valve and the seat carefully and I expect you will see something abnormal - not smooth and continuous.
 

biken stins

Member
Joined
Jun 28, 2008
Messages
341
When mine did what your is doing it was the float. Some how it filled with fuel and would not stop flowing untill fuel was turned off. Replace it.
Or take it out and put a cork in bowl and see if it stops.
Float has been sitting a while and fuel is still in it. Shook it well but nothing comes out. Must be a real small hole.
The cork trick was found om this site and does work well and long enough to get another.
 

trupro

New Member
Joined
Jul 26, 2009
Messages
6
Thanks for the help.
It was the float.

A little carb spray into the mechanisms as I worked them gently back and forth seemed to do the trick.. I have NO gas leak now.

Thank you for the replies!
 

Hawk

Member
Joined
Feb 11, 2009
Messages
33
Glad you got it fixed. Here's a shot for future reference if you have problems.
Hi Graucho,
I followed your procedure and I made it worse LOL! The minute I open the fuel valve the carb bowl fills up and starts come out the top.....primer and air filter as near as I can tell. This is a factory 66cc 2 stroke carb..NT. Any other thoughts? Buy a new one? If so which one?
Tx Jim
Indian Wells CA
 

Molotov256

Member
Joined
Nov 6, 2008
Messages
142
When mine did what your is doing it was the float. Some how it filled with fuel and would not stop flowing untill fuel was turned off. Replace it.
Or take it out and put a cork in bowl and see if it stops.
Float has been sitting a while and fuel is still in it. Shook it well but nothing comes out. Must be a real small hole.
The cork trick was found om this site and does work well and long enough to get another.
Haven't tried the cork thing, but I'd been having similar issues and never once thought to check the buoyancy of the float. Sure enough, I read this post, went out to the garage and pulled the bowl off the carb, and the float was 50% full of gas. I've adjusted the metal piece above the float at least 5 times on this %!$@ing carb, and now I understand why it wasn't helping.

THANKS!!!!!
 
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