Hey check your choke if it's stuck and you try to push the fuel it will die ...or you mite have a on and reserve vaule on your left side if it's on reserve it s not getting any fuel. Up and that's the tank or down that's reserve.
Hope this helps
Carburetor could need cleaning and check air filter make sure its tight
SOURCE: Engine dies after quad is warmed up (10-15 minutes)
Just a hunch, had this happen to a bike of mine years ago, could be the piston rings are gettting ready to go(wore down). What happens is when the quad is cold the rings expand tight into the cylinder walls allowing it to get full compression and run ok. When it heats up they shrink allowing the slightest amount of give which in turn will cause you problems similar to what your describing.
SOURCE: my 2001 yamaha raptor has a fuel leak
There are two possible reasons for this - firstly there may be a crack in the carb. bottom. On ly solution is to drain carb, remove bottom of carb and replace with new one (that is if they are available singly), the other problem might be that the gasket is leaking that seals the bottom to the carb body. Check the screws / bolts that hold this bottom part on and see if any are broken, missing, or just loose. If the anwer is no to these questions, the gasket might still have failed. Drain the carb after switching off the fuel tap or disconnecting the fuel tank, once drained remove the carb bottom and check the rubber gasket for swollen areas, breaks or even a small nick. Replace as necessary.
SOURCE: cant start my 2004 80 ws raptor
buddy sounds like your piston rings have wore or broken strip the barrel off and replace rings making sure you put oil on them when you install
SOURCE: 02 YMF660 Yamaha Raptor won't rev
dude i have a 02 rapter 660 the reverse light was on and it wasent reving i took the battery out and took the ecu out and i found some disconnected wires fixed them and every thing was fine. if you still have a probley with it check the ecu...
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