Need Help With Race Gas Jetting

[stapler55]

I have a 400ex with a Sparks Pipe, Filter and the air box lid off. I will be at about 5500ft. I want to run 110 octance with no mixing (50/50). What dyno jet should i use? I'm running a 170 now. I was think in 160.

[6858-400ex]

there is no need to run that high of octane unless u have a high compression piston

[Rico]

Originally posted by 6858-400ex
there is no need to run that high of octane unless u have a high compression piston

Exactly


If you have lots of money to waste on race gas then run the hell out of it but you'll gain NO power, also you don't need to rejet when running race gas..:scary:

[chadmel]

I would question whether or not stock compression would even handle that high of octane. It could possibly run worse than on pump gas.

[F-16Guy]

Originally posted by stapler55
I have a 400ex with a Sparks Pipe, Filter and the air box lid off. I will be at about 5500ft. I want to run 110 octance with no mixing (50/50). What dyno jet should i use? I'm running a 170 now. I was think in 160.
With those mods? I would be running no larger than a DJ 146. I run a DJ 160, and mine still runs a little rich up that high (check my sig for mods). Follow the instructions for stage 1 jetting at 3000-6000 ft. Trust me, you would have to dump about $2500 into your engine to need their stage 2 jetting. If you don't have them, let me know; I think my instructions are laying around here somewhere.:D