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In addition to the O.S. SPEED B21 Adam Drake edition 2, we are proudly releasing O.S. SPEED B21 Ronda Drake edition featuring a pink cooling head and pink carburetor restrictors, which are her image color. Ronda Drake is the wife of Adam Drake, and she is also a racer. Now we have two different colors in the same specifications; 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.
Features:
- A pink cooling head and pink carburetor restrictors.
- 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.
Specifications:
| Displacement | 3.49ccm |
| Bore | 16.4mm |
| Stroke | 16.55mm |
| Output | 2.65 ps - 34,000 r.p.m. |
| Practical RPM Range | 4,000-42,000 r.p.m. |
| Weight | 362g |
