**Built-To-Order. Please email and confirm delivery ETA before ordering** #1 FASTEST Engine in SoCal Races April 2025 The Menace90 SS Engine! 42mm Stroker Crank Upgrades: 52mm Bore x 42mm Stroke CNC Smolik Head Balanced Crank PGN 6202 Main Bearings Viton Crank Seals Specifications: Displacement: 90cc Bore: 52mm Stroke: 42mm Cylinder Material: Aluminum Nikasil HP: 10-12 hp Torque: 6-6.5 ft-lbs Peak RPM: 10,500-11,500 Top Speed: 55+ mph Oil Ratio: 32:1 Synthetic Does NOT include intake, sold separately. Optional: Porting the cylinder, cleaning up the ports, and adjusting port timing. Additional lead time. 30 Day Limited Engine Warranty Important Notes All engines are shipped with large squish (1.0-1.4mm) to ensure safety when first tuning. You may adjust 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. Recommend Spark Plug: NGK BR8HS Recommend oil: 32:1 Synthetic
