2003 Yamaha Raptor 660 - Engine Stalls And Dies

[crx686]

HI

I have a Raptor 660 2003.. I'm having a problem of the engine staling out when i Ride it.. I turn it on and it sounds fine now when I take it out and rev it up it starts choking and starts dieing on me...It doesn't do this all the time. I got to ride it for five mins then it starts to choke.. the carb has been rebuilt about 6 months ago....is there a oil pressure switch on this model?? Thanks for your help..

[oxidized_black]

is it a fuel problem or timing? does it seem to starve for fuel or get too much can you tell?

[crx686]

I can't really tell. I would think its starving for fuel..But It starts right back up once it dies.. I was thinking it was the stater. Isn't that where it gets its timing? My friend told me its computer timed which i don't know...

[oxidized_black]

stator controls power, cdi delivers the energy, coil makes the spark if stator is good, carb just delivers the fuel .... hard to say whats going on with your engine, you know? maybe you need a bigger jet, leaving it idle, it might just fill the bowl again to give it enough gas

[myquadrepair]

Sounds like the carb and the floats or fuel line going into the tank. Pull the line off and make sure you have a good flow to the carb. Turn petcock on and off to see. also check the floats when the slide up to the top that they are not sticking at the top and not letting fuel back in to the float bowl.

[oxidized_black]

i see you had the same type of problem a year ago, when it was stored over the winter, did you empty the tank or put stabilizer in it? are you running this with the old gas still in it? if you are, i would dump the old gas and put in fresh, and a new spark plug. JMO

Edited May 25, 2012 by oxidized_black

[crx686]

The problem i had last year was a little different. THe gas is not old. I fixed it a year ago the carb was rebuilt and was running good every sense until a couple of months.. I already changed the spark plug. Also made sure there was oil getting to the cam and valves at top...Now it does burn oil. But sometimes the quad will work for about a hour then start choking. Thinking its electric now what i dont know is if the timing is off i dont know how to check that.

[oxidized_black]

pop your plug out when its cold and turn it over and look at the spark. then ride it for that hour and do the same thing with the plug. if the colo(u)r is weaker, you have a bad coil. timing might still be good, carb is good, valve seals might need changing if alot of oil, but if not, just make sure you check your oil when you go out to ride ...