Are you talking about bulb under air box? That's not priming bulb.It is oil viewer and drain for air box. Sounds like carb and jets just need a real good cleaning. Also have you checked your spark plug. If its is old and worn it will stop working properly and cause malfunctions.
That is just a hand primer for when you run out of fuel. you may need to change the fuel filter. and clean out the fuel chamber and veins in the carb. if filter is old 2 years then it should be changed.
SOURCE: I HAVE A CARB PROBLEM AS I DRIVE THE HONDA A LINE
The float needle is stuck open. Typically the needle can get a speck of dirt or the float adjustment arm is not properly aligned. The arm should be able to close the needle at approximately 90 degrees. Remove the float bowl and look at the carb from the side and adjust the arm to seat the needle when the floats are about where they would be as if the bowl were full of fuel.
Good luck.
SOURCE: My 2007 honda trx420fm rancher will idle but will
try backing out your fuel/air mixture screw 1/2 a turn. This should be 3 turns out from seat.
SOURCE: 2004 Quest 500--Starts fine. Will
The problem would appear to either be with the mixture or with the head.
Too rich a mixture (too much fuel) will cause black plugs - when you take them out do the engine and plugs smell of petrol? You need to adjust the carburettor. Mark where the throttle screw is to start with and then slowly screw it (in - I think) to reduce the petrol flow.
The other alternative is that their is a problem in the head. Does the engine blow a lot of blue/black smoke out when it is hot. If yes it means a full engine strip down!
SOURCE: grizzly 660 will not start
It could be a clog fuel filter. Also check your carb it may need general cleaning, jetting may need replacement.
Cycle Country
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