[Christ]

Originally Posted by JasonG

This guy has a nice calculator that works, simple too www.rickwrench.com/bunchofcalculators.html

X pipes don't work on twins as the pulses are too far apart to mesh as they do in a V8.
The small pipe on the Ninja250 H layout is called a balance pipe. It is too small for scavenging but I can't remember if it was for noise or emissions ......

Beatr911 that link at dairally looks deep, i cant wait to try it out !

On the carb switch, 1 single carb usually gives better low end torque while separate carbs perform better at higher RPMs.

I thought about that after I posted... it's also more expensive to use/tune 2 carbs, so I'm going to stick w/ the single carb, but try to lengthen/smooth out the manifold so I can at least catch the 4th region harmonics... cuz man, that thing is "dirty" right now. It's a log-type intake w/ the carb right in the middle, so the immediate circumstance is that the flow path has to make 2 90's just out of the carb, and I'm certain I'm getting fuel pooling in there somewhere.