This is the New O.S. SPEED B21 ADAM DRAKE 4 engine combo with T-2090SC+MB01-75 exhaust system.
Features:
Based on OSB21 AD4 Cooling-head with extra fin for better cooling. AD4 specific cylinder design for more torque. AD4 DLC coated crankshaft with new modified inner diameter for better low and mid range power. Inner head with silicon O ring for reducing vibration and preventing dust AD specific blue restrictors. Rear-cover with thrust plate reduces friction against the connecting rod to extend its life. Long stroke 16.8mm engine Ceramic Main-Bearing Specifications:
Displacement： 3.49 cc / 0.213cu.in. Bore: 16.4mm / 0.646 in. Stroke: 16.55mm / 0.652 in. Output :2.65 ps / 2.61 hp / 34,000 r.p.m. Practical RPM range: 4,000-42,000 r.p.m. Engine Weight:352g / 12.42 oz. Includes:
Exhaust system T-2090SC+MB01-75 T-P3 plug 6mm Venturi 8mm Venturi Exhaust Gasket Dust Cap Set (3mm/16mm/18mm)
