€359.00 €339.00

1AN00 O.S. 21XZ-B SPEED SPEC III
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1AN00 O.S. 21XZ-B SPEED SPEC III

 The O.S. SPEED 21XZ-B Spec III is the evolution of the Spec II, which has enjoyed much success at races all over the world. Low- to middle-range torque has been enhanced even more, providing a great advantage on tracks that require lots of power. You’ll easily hear the difference in the engine’s roar when warming it up on a starter box, and once you’ve raced with the Spec III you’ll want to stay with it.

 
FEATURES
 
The newly developed cylinder liner features 3 scavenger ports and 3 exhaust ports, and works with the newly designed crankcase to deliver more torque with less fuel consumption. To improve drivability, the drop-in type outer head is lighter, with a lower CG than the Spec II. Some components could not be improved upon, such as the silicon-potted, DLC coated crankshaft with pressed-in tungsten weights. The carburetor is also the same easy-to-tune 21J with 6.5mm restrictor. When you add the Spec III upgrades to the legendary O.S. SPEED 21XZ-B engine, you have a dependable, high-performance powerhouse.
 
SPECIFICATIONS----------------------------
Displacement: 3.49cc/0.213cu.in
Bore: 16.27mm/0.641 in. 
Stroke: 16.8mm/0.661 in. 
Power Output: 2.65ps/34,000r.p.m.(2.61hp/34,000r.p.m.) 
Practical RPM: 4,000~42,000r.p.m.
Weight: 353g/12.45 oz.
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