will a FmF pipe work good on a 99 sport 400?
also waht else can i do to this bike 4 more power?

 

There are a lot of things you can do to enhance performance. My first suggestion is to get in touch with Rick Ritter of RCR (Ritter Cycle Racing). You can go to his website and see what he has to offer. Many of us are using his "Stage 1 Kit" and most love it. www.rittercycle.com HTH

 

the best way is to boost port the clyinder and feed the ports from holes in the piston just under the rings to use the fuel trapped inside the piston on the downstroke. this will also make the engine run cooler as you have fresh cool fuel under the piston every downstroke.

 

Do not buy the FmF pipe. You will loose to much low end. The FmF pipe was designed with top end in mind and it won't even give you that much top either. I bought one and now is collecting dust in my closet. The HPD trail pipe works real good and I have heard the RcR is also pretty good.

A good pipe and a clutch kit should be the first mods you buy for a Polaris two stroke. I notice a big difference in performance. You should get a good filter too if you don't have one yet.