[atvrider08150]

Alright, I just down sized from a 450r to a 400ex and im looking for more power!

I mostly trail ride and just screw around with friends drag racing, jumping etc.

Current aftermarket parts
-K&N with outerwears
-FMF powercore slip on
-14t front sprocket - loving this for wheelies

I was looking at getting the powerbomb headpipe, a stage 1 hotcam, pulling the choke from the carb? obviously a rejet and a non programmable dynatech cdi for better spark and throttle response.

Would it be worth just getting a full curtis sparks exhaust? or does the fmf give enough power?

also will the dynatech cdi do anyting?

Hope you guys can help thanks!

 

[james1300]

Save your money.
Buy yourself a TRX700.
Know that the more money you pour into a nice 400ex you will NEVER get out.

 

[kartl]

If you are really thirsty for power, best thing do is to sell your 400ex and get bigger displacement atv like TRX 700. Having heavy engine mods in a stock engine is not really worth it will surely burn a lot of money and reliability would also suffer.