Motorcycles, Snowmobiles, Go-Carts, ATV's and Golf Carts - Yamaha '85 ATV carb problem

My newly acquired '85 ATV Yamaha model 200 is giving a carb problem. I have taken carb apart, cleaned and used compressed air to blow out all ports, etc. Gas is getting to the needle valve but is not getting to the bowl. When gas is manually poured into the throat of the carb, the ATV starts right up and runs until that gas is gone. HELP!

That should be an easy fix. If you know the gas is getting to the float valve and it's not entering the bowl, you have something pinning the valve shut. The linkage that would do that (actually, the only thing that can) is the float as it mounts in the carb casing at the pin that mounts the float.

Remove the bowl (entire carb if necesary) and check the movement of the float against the end of the float valve). The valve should seat with the top line of the float parallel to the underline of the carb which it mounts against.

Once you have determined that setting is correct, attach a tube to the inlet of the carburetor and pour fuel down that tube. Hold light pressure on the float to ensure it shuts off the fuel flow, then let the pressure off to ensure the flow of fuel past the float valve resumes.

When you have that point passed, put it all back together and it should work fine.

If you should, by chance, do the the above and the fuel still isn't entering the bowl past the float valve, you would have an obstruction in the fuel passage that leads from the fuel line to the float valve. That being the case, remove the float/valve and blow air reverse to normal fuel flow to remove it.

Hope this helps,

Good luck,

Bob

Bob