Howdy, folks. I bought a 2001 Raptor 660, and I took the spark arrestor out and the airbox lid off, to do me until my wife lets me make some "aftermarket" purchases. My question is, do I need to rejet and if so, what are your suggestions?

PS- Taking out that spark arrestor out made a BIG difference in the all stock Raptor.

 

Yes you need to jet it. !55/160 mains would be close.
How are you holding the filter on without the lid?

 

It has a UNI filter on it. (sorry, I forgot to mention that). I have decided to keep the airbox lid on, just to be on the safe side.

Do I need to rejet just taking the spark arrestor out?

Oh, and thanks for the reply!