Another Raptor 80 question

[Kevo700r]

We are have trouble with the carb. We have fuel to the carb but can't keep fuel in the bowl. We put fuel in the bowl and run it for a few and it empties out. I have tore it a part and cleaned it. Is it some thing easy I am missing?
Kev

[Bert]

Have you found the problem?

[Kevo700r]

Not a thing. He has given up right now. No much to the carb but I have no idea. Booooo 

[Bert]

I can't help, I know nothing about carbs either 

[Krandall]

Does the carb have a built in pump? Is it gravity fed?  or is there an external pump? I think your problem lies somewhere in that region. I know in my old Snowmobile, it had an external Mikuni Fuel pump butterfly style, and the plastic butterfly inside the pump went bad. was a $10 kit to fix it from Dennis Kirk.

[Kevo700r]

i believe it is gravity. that's why it is blowing my mind. could the float have something to do with it? I will check again with my buddy. (his kids quad)

[Krandall]

dang.

Umm, the float "COULD" have something to do with it.. on my bro's mini-bike, carb is gravity fed. on the floats they are hooked to a metal butterfly thing, which pivots on one end. when the float goes down the butterfly falls and pushes on a needle valve which lets more gas in. Could be something like that as well.

[Kevo700r]

i just don't know. I am thinking if the float is stuck in the up pos. will it not allow fuel in the bowl?

[Krandall]

i just don't know. I am thinking if the float is stuck in the up pos. will it not allow fuel in the bowl?

If it was stuck in the up position. You are Correct. It won't allow fuel in.

[Peelz]

totally have a stuck float valve, or stuck float. Not a tough fix. Floats push spring loaded needle valve, to open or shut. My bet would be needle valve is stuck to the valve seat or seal. I had opposite problem on 660. Got sand in it from dunes, valve stuck open. Puddle of gas on the trailer, relatively easy fix though.

Once, I had a honda 400 motorcycle with leaking bowl problem..new floats, floats I got were too big and would get stuck open when bowl was full, so it would run great for 5 minutes, then flood, then gas would start pouring out of the bowls. Your floats may be stuck down.

[Kevo700r]

Cool guys. I will let my buddy know. I will keep you posted when we give it a shot.

[Krandall]

Any word back?

[fredyd]

Did you get it fixed? If not I've had to fix a few carbs that didn't have the bowl aligned right. I haven't pulled apart a raptor carb but a lot of them won't let the float come down if it isn't lined up properly. There isn't as much clearness in there as one would think. Another thing to ask is, has anyone pulled the old tap on the bowl with something hard trick? Definitely a no no. I fixed one last week for a guy who tapped on the bowl with a rock and dented it in just enough (Nearly unnoticeable) to hold the float up. If you have the carb off a simple trick to check if the float is moving is  to give it a shake up and down and listen for the sound of the float going up and down.