Intake / exhaust ports

[lee]

Has anyone made their intake ports smaller and shaped their exhaust ports so as to stop the exhaust gases getting back in to the cc? It can be done with JB weld.

Homework

The 2007 Superbike

 

[BorgerBigDog]

Good info Lee :2thumbs:

 

[Raywood]

Interesting and I agree with their thought process.