77 & 83mm 40HP/1200cc Cylinder Shim (Set of 4)

For setting your engine proper deck height.
Use these shims to adjust deck height for optimum performance. No need to machine the pistons.
All popular thicknesses offered. Set of 4.

Check out our engine calculator to determined proper thickness.

http://www.aapistons.com/pages/engine-capacity-and-compression-calculator

Sizes available:

.010

.020

.030

.040

.060

.090