intake riser pros/cons?

[philr]

Originally Posted by stitch_man87

i just picked up a stretched and lowered tao tao powermax 150 and i'm tearing it down and rebuilding. Because of the rear mount the previous owner flipped the carb around and started cutting (or possibly chewing, it was pretty ugly). I flipped it around the right way but it won't clear the mounting shaft/mount. I figure the simple solution would be to stack a few insulators until it clears or order an intake riser. The engine is stock with bolt on's to best of my knowledge. What are the effects of lengthening the intake manifold if any?

Increasing intake runner length increases ram effect at higher RPM, minimal effect at lower RPM. As long as everything is properly aligned for a smooth flow, you should notice little or no effect at low RPM and minimal effect at maximum RPM.