The brand-new 2008 Zenoah G240RC engine is a 22.5cc (32mm bore, 28mm stroke) performance machine. Zenoah took their powerful, reliable G230RC engine and made it even better. Major changes include a 4-bolt cylinder design for improved sealing and reduced gasket blowout (an improvement from the 2-bolt cylinder design of the G230RC); a stronger and lighter crankcase; an additional crankshaft bearing; redesigned cylinder fins for better cooling; larger ports; the high-performance WT-990 carburetor with accelerator pump as standard equipment; a metal-impregnated insulator gasket for a better seal; and modified cylinder hardware to better resist vibration. This engine offers serious performance. It features a 4 transfer port 34mm cylinder, Walbro WT-990 carburetor with accelerator pump (15.88mm bore, 12.7mm venturi, independent high and low jets), lighter flywheel, "hemi"-style combustion chamber, and full-circle crankshaft. Includes 54mm inner clutch assembly preinstalled. Includes installation instructions. Engine is available in complete form, or you can choose purchase the engine without the carb assembly, airfilter, or muffler if you already have these parts and don't need them.