Yamaha GP1200 65U case porting
WCPORTING ported 65U watercraft cases. Case porting on these engines make big 
power gains!  Stock cases are restrictive and block air flow and take away power.
Customers have saw great power and throttle responce after porting!
            05'-08' Yamaha GP1300R non power valve cylinders
WCPORTING ported GP1300R cylinders make BIG POWER!  We have done many engines with great results! We currently have a single piped Yamaha watercraft running 81.7 mph with the right parts and setup!
2010' Kawasaki SXR stock manifold port matched to VF3 reeds and fully ported runners.