O.S. 21XZ-B ABCs

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O.S. Engines^® 21XZ-B ABCs

Features

The Speed-Tuned 21XZ-B features a black-anodized cylinder head which reduces height by 9 mm*. Machined holes improve cooling, reduce weight, lower the center of gravity and improve vehicle handling.
*compared to the 21VZ-B V-Spec II Speed

21J2(B) carburetor and all three restrictors

The Speed-Tuned version features a 21J2(B) carburetor, which 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.

Competition-caliber performance!

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O.S. 21XZ-B ABCs deliver top-of-the-line power and performance for competition. The 21XZ-B and the high-performance Speed-Tuned 21XZ-B both improve torque and acceleration while reducing weight and the center of gravity.

21XZ-B ABC w/21J2 Carb Features

New 21J2 three-needle carburetor includes a 7 mm restrictor for fine-tuned control.
Long stroke allows for superior torque.
Provides improved fuel mileage and a stronger crankcase.
P3 glow plug, exhaust seal and dust cap set.

21XZ-B Speed ABC w/21J2(B) Carb Features

Unparalleled, speed-tuned power characteristics.
Lower fuel consumption – offering 8% longer run times than the standard 21XZ-B.
Race-proven 3-port sleeve with special Speed version inner head and porting for smoother acceleration.
Tough, DLC-coated crankshaft features a silicone-filled intake passage for improved fuel flow.
New 21J2(B) three-needle carburetor includes 6 mm, 6.5 mm and 7 mm restrictors for fine-tuned control.
A lowered center of gravity provides steadier vehicle handling.
Long stroke allows for superior torque.
A black anodized crankcase with ceramic ball bearings helps reduce resistance and increase performance.
P3 glow plug, exhaust seal and dust cap set.

Specifications

21XZ-B ABC w/21J2 Carb Specs Displacement: 0.21 cu in (3.5 cc) Bore: 0.6 in (16.3 mm) Stroke: 0.7 in (16.8 mm) Output: 2.5 hp @ 33,000 rpm RPM Range: 4,000-40,000 Weight: 12.6 oz (357 g)	21XZ-B Speed ABC w/21J2(B) Carb Specs Displacement: 0.21 cu in (3.5 cc) Bore: 0.6 in (16.3 mm) Stroke: 0.7 in (16.8 mm) Output: 2.6 hp @ 34,000 rpm RPM Range: 4,000-40,000 Weight: 12.5 oz (355 g)
Common Requirements: Glow fuel, Muffler, Tuned pipe and Manifold