Carburetor Problem

[cruiser99]

Carburetor Problem

My Bruiser is sick (77 model). It looks like a fuel problem. Too much of it. Looking down the carb (air filter removed) after starting and running for 15-20 seconds just fine, fuel start coming out of the main jets. First from one and then from the other. At the beginning small trickle turning into a almost a steady stream. Obviously, by that time the engine stops. The fuel keeps coming out of the jets foe a while even after the engine stalls.

Any suggestions?

Thanks, Doron.

 

[Romer]

do you have a stuck cable or linkage?

 

[Landpimp]

do you have a mechical(stock) or electic fuel pump(added)

 

[Pighead]

Nope. You got a stuck needle valve that's not shutting off the gas going into the float bowl.
Check by looking in the porthole for your fuel level.
When you say fuel is coming out of the "main jets", do you really mean those two float bowl vent tubes (the big slanted hollow things that are the first thing you see when you look down the throat)?

 

[Ian Rogers]

hey a quick fix is to tap the fuel bowl, like with a screw driver

 

[65swb45]

Classic case of flooding from a needle that won't close on the seat, or a float with a hole in it. Either way, you can tell a lot more from pulling the air horn off the carb.

 

[cruiser99]

Thanks for all the help. I'll pull the air horn of the carb and take a peek.

To answer some questions, went over the cable and linkages and they look fine. The fuel pump is a stock one and fuel is coming out of the jets themselves. The main ones (made out of brass) that sit in the middle of the venture. Not the slanted aluminum tubes that are right below the filter.

Thanks again,
Doron.

 

[Pin_Head]

Nomenclature:
The aluminum ring-like doodads that sit in the middle of each venturi are called nozzles.
The slanted brass tubes that are part of the air horn or top cover are bowl vents.
The main jets are inside the fuel bowl which you can't see.

Either way, it still sounds like the needle valve isn't closing. It is easy to fix by removing the top cover and cleaning it or by just whacking it and hoping the dirt drops out. If fuel continues to drip after you shut it off until the bowl is empty, the carb is siphoning. It is usually caused by blocked air vents in the top cover and emulsion tube.

 

[cruiser99]

Thanks Pin_Head. Got it.

It was piece of dirt stuck in the needle valve. Actually it was a piece of rubber from the pump plunger bellow (accordion looking boot) that is deteriorating. The bowl was completely full when I removed the top cover.

Any idea where to get the rubber bellow from?