i gotta raptor that has been setting for two yrs gas had been left in it and it had started tho gum & varnish.bike would only run with the choke on half way or better than would die after a bit.ive cleaned the carbs and drained the tank so it now has fresh gas .the bike will idle fine now with no choke and runs good to about 1/4 throttle than it starts snapping and backfiring just wont clean out and run.bike is all stock other than white bros slip on pipe i think it still has stock jetting any help would be great. do you guys think this is still just a fuel problem or could it be more?

 

on your clutch perch...pull back the rubber dust cover....remove the top wire connection....use something sharp to push down on that little clip and pull it out....once out you will see a spring loaded button...push it in and out...spray with wd....start it and push the button in and see if it revs....i just did this saturday

 

You can also unplug the parking brake sensor from behind the left headlight(2-wire barrel plug).This is a common problem with yamaha.

 

ill try it tomorrow thanks guys

 

no luck with parking brake guys