21XZ-B ABC Speed Spec II
Superior Speed Spec performance!
O.S. Engineers have developed a leaner, meaner 21XZ-B Speed Spec II to bring you even more power at a lighter weight. Some of the great new features include: a lighter DLC coated crankshaft, a newly designed outer head with V-shaped fins for more efficient cooling and a dual-adjustable 21J carburetor for smoother acceleration and better fuel mileage.
Specifications
Displacement: 0.213 cu in (3.49 cc),
Bore: 0.641 in (16.27 mm),
Stroke: 0.661 in (16.8 mm),
Practical RPM Range: 4,000-42,000,
Output: 2.65 ps @ 34,000 rpm,
Weight: 12.52 oz (355 g),
Requirements: Car blend glow fuel with 10-30% nitromethane content, Air filter and exhaust (depending on vehicle), Glow starter and track equipment
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