I have a 2004 660 raptor. It has a k&n filter, and a white brothers silencer. Do i have to rejet? I installed a new spark plug. Drove it for 1 hour. Removed the plug and it is white. If seems to be running well. No problems, No backfiring. Is it ok like this? or does it need a rejet?
Thanks for any help. Rich..........

 

I would definitely jet it up!Stock is 140 Left 145 right,i would try a 150L and 155R.If you are white you are probably most likely lean.

 

Thats what i thought but i'm not having any running issues. I'm in chicago, last night was around 45 degrees. Thats when i pulled the plug after ridding about 1/2 hour. We also did the same on a 100% stock raptor we have. He was ridding next to me. His plug was white also. So i am not sure if white is normal in cold weather.

 

When its cold you will be lean. Pull the spark plug in your car look at it. well unless you have a diesel truck or sompin [img]i/expressions/face-icon-small-wink.gif[/img] i would definatly add more fuel though. keep bumpin up the jets till it feels like ya are loosin power and back em down 1 size.

Edit: You will be lean because like you prolly learnt in chemistry the gasses in the air are a lil less excited about jumpin around and Huddle together so to speak tryin to stay warm [img]i/expressions/face-icon-small-wink.gif[/img] So with with everybreath your motor takes it is getting more air and same fuel so lean

 

I heard the jets are pretty hard to do on a raptor. Is this true?

 

I don't think it is too hard, my raptor was the first quad I had ever jetted, at first it was semi-hard because i was fresh, but not it is no problem, just more annoying if you ask me. Adjust some put it back together, not working? adjust some more, it just is long and boring is all. [img]i/expressions/face-icon-small-smile.gif[/img]

 

Thanks for the help guys.