Zombie - Thanks. Yeah that about covers it. Except that the pipe limits the rpm.
That is the issue. I'll see how much bottom end I loose with the RS2
and how much rpms I gain. BTW it runs freaking great as is !
The pipe only works efficiently at a certain rpm range. Lots of other things limit rpm but not really the pipe.
Ign curve is the first, engine port timing is second, carb/pipe size is third, CVT is next, and pipe tuning is last.
If you cannot get over 8k, and you want to get over 8k... It's not the pipe
If other S-9's have your same cylinder, and beat 8k, it's not the cylinder (unless it's worn)
How about the CDI... Same story except for the wear part.
Maybe you have a restricter or in the pipe?