**Built-To-Order. Please email and confirm delivery ETA before ordering** The Most Powerful engine kit on the market, the Menace85 SS bolt-on kit! 8.3HP!! Upgrades: 52mm Bore x 40mm Stroke CNC Smolik Head Balanced Crank "MZ65 Style" Expansion Chamber Pipe PHBG 21mm Carburetor CNC Piston Port Intake Standard Parts: 36t Sprocket and Hardware 4 Bolt Chain Tensioner Clutch Lever and Cable 415 Chain CDI Fuel Tank and Hardware Chain Guard Throttle Assembly Specifications: Displacement: 85cc Bore: 52mm Stroke: 40mm Cylinder Material: Aluminum Nikasil HP: 8-9 hp Torque: 5.5-6 ft-lbs Peak RPM: 10,500-11,500 Top Speed: 55+ mph Oil Ratio: 32:1 Synthetic Optional: Porting the cylinder, cleaning up the ports, and adjusting port timing. Additional lead time. 30 Day Limited Engine Warranty Important Notes Pipes are made to be a "Universal" fit. Slight adjustments may be needed to fit your frame due to slight frame, engine, and pipe manufacturing variations. While we check over every pipe, small pinhole leaks are inevitable and unavoidable. Pipes will not be warrantied for such symptoms. All engines are shipped with large squish (1.0-1.4mm) to ensure safety when first tuning. You may decrease squish for increased power but be aware this will cause extra wear and tear on the bottom end. DO NOT go below 0.8mm squish. The carbs are tuned rich with 90 main jet by default for engine safety. For optimal performance, the carbs MUST be tuned for your environment. 80-90 main jet range is expected, using Dellorto 5mm Round Jets. Recommend Spark Plug: NGK BR8HS
