Yamaha hot up tips

[Rusrog]

I am setting up a 14'6" tunnel deck mono and am going to build a hot 130 Yamaha. Just wondering if any body has any idea of port heights and head cc,s or any other tips to upgrade the Yamaha,s. I am located in Australia and good bits are hard to find in Oz. Also wondering if anybody knows where to get velocity stacks. Any help would be great.
Bullshot racing

If you have access to any decent welders or machinists then you need to go ahead and build a horizontal reed V-4. No sense messing with the verticle reed stuff as you are giving away a bunch of power.

If not... Find some 34MM carbs and add some compression. Depending on what you want it to do and how many RPM's you are wanting to turn... You may or may not need to port the motor.

I may have a set of velo stacks that will fit but they will not add much more than some cools looks. But I like cool lookin stuff too so I run them.

Russ