Megamax/Powerbomb jets and needle?

[khen]

OK I just received my used Megamax and Powerbomb header for my 400EX, I am also installing a K&N filter/Outerwears and removing the airbox lid. My altitude is 4500 feet.

Any idea's on what Keihin jets and needle position I should start with?

[khen]

Anyone? I just need a starting point. I'm mostly curious about the needle should I change the position from stock???

Thanks

[khen]

:macho

[JOEX]

It's mostly trial and error. Most peole don't mess with the needle but you can try raising it one notch, 4th from the top, and go from there. Or you can try one of those spacers that will make 1/2 notch changes.

With you being at 4500 ft. the stock setting might be fine.

A 155-160 main would be a good starting point.

Joe

[khen]

Thanks