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O.S. Engines .21XZ-B Speed Spec II Competition Engine OSM12175
, Displacement:, 0.21 cu in (3.5 cc), Bore:, 0.6 in (16.3 mm), Stroke:, 0.7 in (16.8 mm), Practical rpm:, 4,000-40,000, Output:, 2.56 hp @ 34,000 rpm, Weight:, 12.5 oz (355 g), Includes:, 21J2(B) carburetor, P3 glow plug, 6.5 mm carb restrictor, exhaust seal and dust cap set, Requires:, Glow fuel, muffler, tuned pipe and manifold, ,
This is the O.S. Engines .21XZ-B Speed Spec II Competition Engine.
Features:
Lower fuel consumption offering 8% longer run times than the former model, 21VZ-B V-Spec Speed
Tough, DLC-coated crankshaft features a silicone-filled intake passage for improved fuel flow
A lowered center of gravity provides steadier vehicle handling
A black anodized crankcase with ceramic ball bearings helps reduce resistance and increase performance
Unparalleled, speed-tuned power characteristics
Race-proven 3-port sleeve with special Speed version inner head and porting for smoother acceleration
New 21J2(B) three-needle carburetor includes 6 mm, 6.5 mm and 7 mm restrictors for fine-tuned control
Long stroke allows for superior torque
Carburetor includes 6 mm, 6.5 mm and 7 mm carb restrictors so you can gain a competitive edge!
A P3 glow plug provides quick, easy starts in all weather conditions
Numerous champions, including Atsushi Hara and Mark Pavidis, have trusted O.S. Speed Engines to give them the competitive edge. Now O.S. is proud to continue that winning tradition with the all new 21XZ-B Speed Engine!
Its specially designed black-anodized cylinder head reduces weight and improves cooling, while the upgraded DLC-coated crankshaft improves fuel flow. It all adds up to yet another exceptional Speed tuned engine from O.S.
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Found 11 years ago