Feel the power that only a larger engine can provide. This kit is a TORQUE MONSTER, with killer low end and midrange power. ESP modifies this cylinder by machining at the head. The stock 36mm cylinder does not have room for the longer crankshaft in this kit, so ESP has machined out the proper spacing. This is a more efficient and reliable solution than stacking gaskets to achieve the needed space, as there is proper spark plug clearance and the piston ring remains in the well-plated area of the cylinder. The squish band is cut so there will be .020"-.025" of squish (using the stock .020" cylinder gasket), and the combustion chamber is machined to get the compression ratio down to 14:1 for running on premium pump 91 or higher octane gasoline. These cylinder are not ported - the port timing and shape is still stock. The head geometry, however, is reshaped to the proven standard 'hemisphere' shaped combustion chamber, and the squish area equals 50% bore area, for more effiecient burning. Kit includes ESP modified 36mm cylinder, 36mm piston, piston ring, piston pin and two pin washers, circlips, two cylinder bolts, insulator gasket, CMR7H spark plug, and choice of 30mm stroke crankshaft. Increases your engine displacement to 30.5cc (36mm bore, 30mm stroke). Increases engine power SUBSTANTIALLY - estimated engine power output 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. 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 G230RC / G260RC. For cars - fits FG: Marder, Leopard, Monster Beetle, Monster Truck, Stadium Truck, Pajero, HARM, Sportline, etc. Also fits Smartech Traveler, Duratrax Firehammer, XTM, Carson Attack, HPI Baja 5b, and most other large scale onroad and offroad RC cars.