i have a couple hundred $ saved and am looking at either a new mild cam or a high compression piston for my 400ex. i was wondering wat u guys thought would be the better buy for the money. also i wanted to no wat is the highest compression piston i could safely run on 92 octaine below 4000ft. wich of these 2 would make better power increases? any brand suggestions?

 

both get a racing cam for it then hardened rockers valve springs and the other stuff, bore it to 416 or 440(some 416s can run with 440 if properly done and tuned).then smoke ssome a$$

 

www.magnoliatractorinc.com - Get the Stage 2 Cam....$127 shipped.

www.rockymountainatv.com - Get the Wiseco Std. Bore Piston(10:1, safe on pump gas)....Around a $100.

www.rockymountainatv.com - Tusk Top End Gasket Kit....Around $20.

I'm assuming you have a aftermarket exhaust system. Add the mod's above you will be surprised how much power you gain.

 

that stage 2 cam would be good for averall riding without a bore kit right? and cant i go higher with the compression than 10:1, isnt that stock? also if i bought the stage two cam would i have to hardweld or replace nething else

 

emac - the stock compression is 9.1:1

 

i recommend running a 10.5 or 10.8:1 je or ross piston. you can either run stock bore, 406 or 416. well, these are what i would recommend for the first time anyways. for these bores i would run a stage 1 hotcam. my friend has one and it is just as quick as my bike with a stage 2 cam. my bike (406) just needs to be at a high rpm for the power to be there. his 406 makes good power with the stage 1 everywhere and he runs dead even with me at top speed. if your running a 416 or larger, i would get a stage 2 cam. with either of these cams, you don't want to run hardened rockers as they will eat the cam away over time.