Ok I've got a 06 500 HO Sportsman.

Already have a clutch kit installed.

Trying to decide if I should start attempting mods on the motor for more HP.

I having trouble finding info on what works and the gains.

 

ck out aaen performance make some nice stuff also try four stroke tech they make a big bore for it a 600 kit wich they say doubles power so should make around 80 hp aaen site says on dyno stock 500 makes 38 hp just using those #s i was thinking about buying 500 to duild a four stroke tech kit (fst) but wating to see what 2011 are hope this helps i have had aaen do alot of work for me and have always had great luck also i would rather modify than go to bigger like 800 850 and so on kinda a sleeper then

 

I'm not going to tear into the motor unless it is already blown up.
It's nice info to have. If I do blow it up then I have something to look forward too.

I was thinking more in the lines of pipe, jet, and K and N air filter.

I've been having a difficult time finding info on the gains and even good setups.

 

I am finding the same thing as you, not much info on these bikes, finding out there is not much we can do to make any more power or speed!

 

ck out aaen performance they have alot of things for add ons call them they are greeat help

 

Check out four stroke tech.net . 628cc big bore stroker and cams for the 500.