400ex hop-up parts

[chadmel]

Here's the question. I was considering putting a Sparks X-4 Full Exhaust, Sparks "Aggressive Drop-In" Cam, 12:1 piston and a 39 mm fcr carb. Anybody have any experience with this setup as far as what type of performance gains to expect? Thanks in advance.

[cals400ex]

that sounds like a pretty good setup if you ask me. my buddy has the x-4 and really likes it. i have the x-6 and i don't think i would get it again. it revs really really high. it almost seems like the pipe is too big for my 426. i would look into a full HMF system too. if you want to go cheaper, you can get a hotcam.

[chadmel]

Cals400ex, thanks for the info.

[Rico]

Originally posted by chadmel
Here's the question. I was considering putting a Sparks X-4 Full Exhaust, Sparks "Aggressive Drop-In" Cam, 12:1 piston and a 39 mm fcr carb. Anybody have any experience with this setup as far as what type of performance gains to expect? Thanks in advance.

You'll only be able to run race gas in it..

Be ready to hold on to the bars because the bike going to pull like hell. You will love the feel. Make sure to run 100.

[chadmel]

I'm planning on running 100 octane. I hope it pulls like hell. I actually changed the cam from a Sparks to a Hot Cam Stage 2 at the recommendation of the dealer. Looking forward to bolting it all on.