OS SPEED B21 Adam Drake Edition 4

This is the New O.S. SPEED B21 ADAM DRAKE 4 engine.

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: 3.46cc 
• Output: 2.68ps @ 34,000 rpm 
• Bore: 16.27mm 
• Stroke: 16.80mm 
• Practical RPM Range: 4,000 ~ 42,000 rpm 
• Weight: 352g 

Includes: 

• T-P3 plug
• 6mm Venturi
• 8mm Venturi
• Exhaust Gasket
• Dust Cap Set (3mm/16mm/18mm)