MX 400 questions

[Hondaistheshiz]

I am looking for a quad to start racing mx. I ahve decided on a 400ex. What motor mods do you suggest to be able to keep up with the 450's, and still be reliable?? I need to run pump gas, but what bore size, porting, cam etc do yall suggest. Also, where can I get a stroker crank form??

thanks

[tdsongster]

I had the exact same questions, talk to C&D Racing, they took the time and answered all my questions. Check around the site, they come highly recommended.

[400exnac]

I know there are answers to that question cause i asked them myself. Ill try to locate it for you.

[cals400ex]

talk to gt thunder for the stroker. he is great and the prices are good.

[400exrider04]

heres just a question but why buy a 400ex and dump loads of money into the motor when you can get a 450r and just put some aarms axle shocks and a pipe on it and be able to go race

[Hondaistheshiz]

I will be buyin the 400 used. If i had the moeny, i would buy a 450. I will ahve to do all these mods over an extended period of time.

[Fast350ex]

check CURTIS SPARKS, #1 engine builder. Here is a list of my Curtis Sparks modes for a 400ex- race cam, heavy duty cam chain, heavy duty valve srping kit,hard faced rocker arms, heavy duty clutch kit, 416 piston, & x-6 exhaust.

[JDiablo]

Originally posted by Fast350ex
check CURTIS SPARKS, #1 engine builder. Here is a list of my Curtis Sparks modes for a 400ex- race cam, heavy duty cam chain, heavy duty valve srping kit,hard faced rocker arms, heavy duty clutch kit, 416 piston, & x-6 exhaust.

The way sparks been lately,i wont be sending nething to him,he is taking forever,i say GTthunder all the way

[AtvMxRider]

Get your suspension before you do any motor mods. You can have all the motor in the world but if you can't put it to the ground what good is it. Get yourself a good set of aftermarket shocks and a-arms and an extended axle. get your stock rear shock rebuilt and you will be good to go.