GP420 Engine Stats: Displacement: 41.5cc. Power 40mm bore 33mm stroke 4+HP 14,000 RPM. Fuel: 91 octane or higher mixed 25:1 with 2-stroke oil.
GP460 Engine Stats: Displacement: 45.7cc. Power 42mm bore 33mm stroke 4.2+HP 11,000 RPM, 2.35 lb/ft torque 8,000 RPM. Fuel: 91 octane or higher mixed 25:1 with 2-stroke oil.