i have an 02 raptor 660 and i just put a slip on exhaust on and now i want to just put an aftermarket K&N or Twin Air air filter. well i went to my dealer and he told me with the new airfliter on my carb will need to be jetted is that true??????

 

When i put the k&n on my 03' i had to rejet it. and then again when i built an exhaust i had to rejet it again. look at your spark plug and make sure its not running lean. if it is then put bigger jets in it.

 

I just bought a k&n air filter and it says right on the box that you dont need to rejet if your just putting a replacement k&n in it.

 

I put in a k&n in my 2 stroke and didn't rejet, it runs fine didn't check my plug, I'm gonna put in reeds also and I don't think I'll rejet for that either. Once my exhaust comes then I have to rejet it.

 

If you just replace the filter - you likely don't need to re-jet it. If you open up the airbox, you will likely need to re-jet.