how much extra power would i get by putting on a k& n clamp on air filter with no lid, HMF exhaust s/o and retting it?

 

An air filter kit doesn't add much, maybe noticable on the butt dyno if anything [img]i/expressions/face-icon-small-tongue.gif[/img]

The single thing that made the biggest difference on my Warrior (same engine) was the 11:1 piston swap. You do have to run high octane fuel and a colder spark plug to reduce detonation (pinging).

Chainging the piston, is not very hard on that ATV. My friend did the 12:1 piston, cam and valve springs. I would recommend that kit. I didn't do the valve springs and I float my valves on high revs.

I haven't done much with mine lately. It's still a project ATV for me to learn on and I put a turbo on it with the stock piston back in and a fabricated EFI.

I bought a Banshee to ride, so unfortunately it has been on the back burner until I buy some more parts for it.