Me and a friend were up at some big gravel piles and i have a TB 250 below, and he has a 2004 sportsman 500, and we dragged and he beat me. He got a head start off the line and i caught him right away and passed him but then he came right back and passed me and just pulled away. I dont know what more i can do to my TB to make it beat a SP 500 at least to my top end. I dont expect to beat it top end wise but i would like to beat throughout my band. Is boring my cylinder out, .020, and adding a wiseco piston my last option and will it make that kind of a difference. I have really good bottom and mid right now for a 250 but need more.

uhh bigger sprocket??

boring and adding a new piston will gain you nothing........it is a good mod, but you will notice very little until you go up in compression. Port and polish that sucker......

I've already had it ported and head milled .02. Your're saying more milling.

change your clutch to match your pipe...

What is your gear ratio? Like the others said you may need to gear it up.

I would say you could just add a reed cage but they are pricey and you already have alot
of money tied up into yours.

was there air in your tires? j/k

who did your portwork? and how severe was the portjob?
and u could always send your quad on a diet, i know them tb's are tanks.

shave the flywheel

Had the porting by a friend who is a performance specialest for arcticcats and it was ported the most without losing much bottom end.