Installation of a good expansion chamber with a high flow air filter will really increase the horse power of your two stroke.
We manufacture our own HVC ycle PERFORMANCE EXHAUST systems For the Yamaha 2-strokes. We are also an authorized dealer for JL-Exhausts by Jim Lomas, and we also carry the economical DG exhaust. Select the Brands below to check out what is offered.
Jetting changes will be required. here is a guide to help out (Jetting Info)