In addition to the O.S. SPEED B21 Adam Drake edition 1, we are proudly
releasing O.S. SPEED B21 Adam Drake edition 2 featuring a bore x stroke 16.4 x
16.55mm, the double-counter weight embedded crankshaft with DLC hard
coating, a ceramic rear ball bearing, an o-ringed inner head, and an
easy adjustable ball link.
- Bore x stroke 16.4 x 16.55mm, which is the maximum in the IFMAR regulation.
- A double-tungsten counter weight crankshaft with DLC hard coating and silicon filler.
- An o-ringed inner head, which absorbs vibration and prevents dust coming into the combustion chamber.
- 6.5mm and 7.0mm carburetor restrictors.
- O.S. SPEED P3 GOLD glow plugs as a standard accessory, which has more
powerful low-middle range and stable idling compare to standard P3 glow
Displacement: 3.49cc / 0.213 cu.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 r.p.m.Range: 4,000-42,000 r.p.m.
Weight: 362g / 12.77oz