OS B21 AD4/T2090SC Combo 1FH01

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

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)

Tuned pipe EFRA2089

Manifold MB01-75mm