[2012Sportsman400]

I was wondering if there is anything on the market to make my 400 H.O. more power full and or increase acceleration and speed. We have 2 400's both are 12's and when me and my dad race mine always seems to lack of all three. Mine has a K&N filter and my dads is completely stock. :cowboy:

 

[5254]

Ditch the K&N and try it again.

 

[Rooskey]

Keep the airfilter and get a dynojet jet kit, slip on exhaust, and an aftermarket primary clutch spring..

 

[2012Sportsman400]

What is the dynojet kit going to do for me?

What will the dynojet kit increase? And how hard is it to install???

 

[Rooskey]

It will adjust your carburetor for the added air flow from the air filter and the free flowing exhaust. If you have basic carb skills its not much of a problem to install. The primary clutch spring will help your bike accelerate, and bring in the powerband much sooner. One of these items will not bare you much of a benefit but with all of them your bike will be a whole new animal..

 

[bgirard420]

It will adjust your carburetor for the added air flow from the air filter and the free flowing exhaust. If you have basic carb skills its not much of a problem to install. The primary clutch spring will help your bike accelerate, and bring in the powerband much sooner. One of these items will not bare you much of a benefit but with all of them your bike will be a whole new animal..

Some good advice here :dito:

 

[bobx2]

Ditch the K&N and try it again.

Ditch the 400 and try an 850.