My warrior keeps cutting out sometimes backfiring.i put octaine booster in clears up a little bit soon as gas up gets bad again.changed plugs run premiem gas still cutting out spitting and backfiring .cranks and idles fine.2003 model

SOURCE: engine idles fine, stalls soon as its given gas

Hi there!

Open up the carb and clean the jets with pressurized air. I also suspect water on the carburetor reservoir, before opening the carb, drain it first then run. Also, make sure the plugs are clean. Pull on the choke when twisting the accelerator, if it accelerates well, then warm the beast at normal temperature first before twisting the throttle hard again.

hope this helps-
levibit-

SOURCE: yamaha warrior atv [yfm 350] bogging problem

my 660 raptor did the same thing! you need to adjust your intake and exhaust valves.(use a feeler gage)

SOURCE: 2000 yamaha warrior atv will not run

do you have good air intake like new airfilter and good fuel flow

SOURCE: yamaha warrior won't start

a yamaha warrior isnt a 2 stroke. they make a street bike nad a four stroke quad. Check your carburator. check your spark plug and check your stator. it may be very minor considering it was running fine then just went out. no noise or anything. you would have heard something if you broke something internal.

SOURCE: 350 raptor only runs with full choke on ,

Hi Mike,
You will find that there is a problem with the carbie. It runs with the choke on because the choke engages the "enricher" circuit. The idle circuit is different a different circuit inside the carb. When just crack the throttle on, you use the pilot circuit, and then main jet with more twist of the grip. You will need to completely strip the carb, remove all jets, spray carbie cleaner throughout, and blow out all capillary tubes and holes inside the carb with compressed air. Pay particular attention to the fine holes inside the venturi near the butterfly valve. You may need to use a fine piece of wire, like a guitar string to open up any that are clogged.
There is not much else that will cause the symptoms you have. Check for air leaks about the inlet manifold also, spray some carbie cleaner about the manifold connections boots, the revs will change when it sucks up the cleaner through the leak.
Happy to talk to you more about it.
regards robotek