These pistons work really well on the sx65 and sx85 with the cylinder height adjusted to lift the cylinder slightly, setting the cylinder height higher with the VHM pistons gives very good power gains, and hole shots.

When installing the VHM piston, call or email us and we will advise you how to get the most from this , by setting the cylinder height . This is a simple mod for extra power, note the VHM piston can only be used with the VHM head, but you dont need the powervalve adjuster or base.( unless you want to be able to adjust the powervalve, for other mods)