Custom 36mm big-bore head kit from legendary 2-stroke tuner Trevor Simpson.
These kits are now PORTED by Trevor Simpson himself!
Kit includes: Machined and TS PORTED 36mm cylinder (28.5cc when used with stock 28mm crankshaft), billet head with engraved signature and cooling fins, 13:1 compression dome, piston, piston ring, piston pin, pin bearing, pin washers, circlips, cylinder gasket, carb gasket, mounting hardware, and instructions. Increases the power and speed of your engine SUBSTANTIALLY! Requires 91 octane (using the R+M/2 octane rating method) or higher fuel. This kit uses the new-style 36mm CY cylinder with a 40mm cylinder skirt width. Fits new-style GGP290 engines (these new-style engines have a wider 40mm crankcase opening to acommodate this larger casting). Also fits TS billet reed induction crankcases. Does not fit older-style GP290 engines with the 38mm cylinder skirt. Does not fit Zenoah motors like the G230RC or G260RC. Does not fit other CY motors like the CY23RC or CY29RC.
These kits now come with the new-style black TS head.
