If displacement is what you crave, look no further. This custom  big-bore combo kit will allow you to convert your current engine into a 30.5cc performance monster. Feel the power that only a larger engine can provide. Kit includes 36mm cylinder, 36mm piston, piston ring, piston pin and two pin washers, circlips, two cylinder bolts, insulator gasket, CMR7H spark plug, choice of 30mm stroke crankshaft, and .040" copper cylinder gasket to provide increased clearance for the longer crankshaft. Increases your engine displacement to 30.5cc (36mm bore, 30mm stroke). Increases engine power SUBSTANTIALLY - estimated engine power output is 3.75 HP. This high-performance product requires 91 octane (using the R+M/2 octane rating method) or higher fuel, and comes without warranty.

Fits Zenoah G23LH / G230RC / G260RC engines. Also fits Chung Yang CY23RC / CY26RC / CY27RC / CY29RC / GP290 engines.
For R/C: Fits a wide variety of 1:5 and 1:6 R/C cars, planes, boats, and helicopters. Same mounting dimensions as Zenoah 26C