36mm Race Ported Big Bore Kit for 28.5cc / 30.5cc

These big-bore kits have been race ported. The intake, exhaust, and transfer ports have been enlarged/reshaped for more fuel/air flow.  This dramatically increases horsepower! Now featuring improved cylinder plating for increased durability. Includes 36mm cylinder, piston, piston ring, piston pin and two pin washers, circlips, cylinder gasket, two cylinder bolts, insulator gasket, and CMR7H spark plug. Increases displacement to 28.5cc when used with a stock crankshaft with 28mm stroke. Increases engine power SUBSTANTIALLY - estimated engine power output after installation is 4 HP! This high-performance product requires 91 octane (using the R+M/2 octane rating method) or higher fuel, and comes without warranty. This kit has the 38mm cylinder skirt and is compatible with crankcases with 38mm top openings.

 

Fits: G230RC, G260RC, CY23, CY26, CY27, GP290, Fuelie 23cc, Fuelie 26cc.