Question about 2005 Yamaha XT 660 R

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My 2005 Grizzly 660 stalls imediately upon giving it gas. I had a new needle and seat installed due to the needle sticking. The carb was cleaned thoroughly and everything installed back to spec. It starts, idles nice but stalls upon throttle up.

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Does it run better on full choke, but only goes slow? I bet I know what it is. On the top of the Carb take off the cover, there is a rubber diaphragm in there, I bet it has a hole in it. When you push the throttle , that creates a vacuum, which lifts that piston to give it gas, otherwise it just gets air, starving for gas, it just kills.You should use an impact screwdriver (ya hit with hammer) to loosen them screws! That soft *** metal strips like its lead!

Posted on Apr 21, 2011

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In the past the intake manifolds on the grizzly engines tend to tear or separate at about the age of your machine. Take your carburetor back off and inspect the intake manifold for damage.

Posted on Oct 06, 2010


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Gas floods into carburetor even with a new carburetor

The only thing that stops gas going into the carb is the needle valve and seat in the bowl of the carb.
Doing the same thing with 2 different carbs sounds like trash in the gas tank flowed into the carb and is holding the needle valve off the seat allowing gas to flow all the time.
Clean the tank. Clean the trash out of the needle valve/seat. Add a small engine fuel filter between the tank and carb.
You should be good to go.

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When off gas is leaking

1. remove the hose from the carb and see if the petcock is shutting off the gas and if not clean, repair or replace the petcock.
2. look in the tank and see if it has rust in the tank even a small haze of rust as rust will cause the needle and seat to stick in the carb and make the gas leak. If the gas tank has a lot of rust it may need a tank rubber liner kit added or even a new tank to stop the leaking.
3. if the bike has been sitting for a while it may have trash in the fuel system(carb/petcock/tank). Rust or any trash can cause a leak. Properly clean out the carb and fuel system and add a new filter when done.
4. Improperly adjusted or bad needle/seat or float in the carb will cause continual leaking. Replace the needle/seat/float and adjust the new one when installed. Check your service manual for float adjustments.

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The bike is leaking fuel out of the left vent tube and if I tap the carbs with a hammer it stops temperarelly. What is the cause for this and would replacing the needles, seats and carb o-rings solve this...

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You do have a sticking float. You can test it with the bowl off by moving the float up to shut off the fuel, and down to allow fuel to flow. Look closely at the float needle seat to make sure they aren't damaged.

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