West Coast Porting offers 1, 2, & 3 cylinder , 2 stroke porting. We have a wide range of services to offer you.
From mild rec porting to all out race porting! Please contact us to setup a combination for your specific needs. WCPORTING can port your cylinders for more
bottom, mid, or top end were its needed. 

06' Yamaha GP1400R big bore EFI.......81 mph at 4100' elevation

 Yamaha GP1500R 4mm stroke, triple piped big bore......86 mph at 4100'  built by WCPORTING

Call us to see what we can build for you!

     We offer custom machined ride plates from Jims Performance.
     WCPORTING has saw speed gains of 4.7mph with the ride            plate alone on our Yamaha GPR watercraft ! Call us for pricing.

00'-08' GPR R&D plate
00'-08' GPR Riva plate
XLL/XLT R&D plate
02'-04' FX Riva plate
02'-04' FX R&D plate
05' FX140/FX-HO R&D plate
05' FX140/FX-HO Riva plate
SHO R&D plate
Ultra 250 stock plate mod
Ultra 250 Riva plate
RXP/RXT stock plate mod
RXP/RXT stock plate open loop mod

WC PORTING   has just released our new TDR waterbox and exhaust mod
for the GPR/SHO conversion ski's !  Everything bolts in using the stock SHO
coupler. We modify the stock SHO exhaust and send it back with a custom designed TDR waterbox. This will be used with the Riva free flow Blue Tube.
No more cutting the big bulky stock waterboxes, this is a complete bolt in system and the sound is awesome!  If you do not have the Riva free flow tube, we can include that with the kit.
2 stroke porting
Crankcase porting
Cylinder boring and plating
Watercraft mods and repairs
Head milling
4 stroke repairs and parts
Stroker cranks
Engine assembly
Jetski water testing and tuning
Exit/steering nozzle boring