O.S. Engines Speed 21XZ-B engine

 



 

Top drivers including Mark Pavidis and Atsushi Hara can vouch for the victory-taking technology of O.S.® Speed engines. Both have stood in the IFMAR Off-Road World Championship winner’s circle as a result of its powerful edge. Now another O.S. engine offers you the same advantage! The O.S. Speed 21XZ-B engine has a completely new design that delivers instant throttle response and impressive torque over the entire rpm range — all at a very attractive price. Check it out:

 

Race-winning power and performance.
Fuel efficiency improved by 8% (compared to the 21XZ-B).
Black-anodized cylinder head with reduced height (by 9mm, compared to O.S. Speed 21VZ-B V-Spec.II) plus additional holes for improved cooling and less weight.
Lowered center of gravity for steadier car handling.
Newly designed 21J2(B) three needle carburetor with 6, 6.5 and 7 mm aluminum restrictors.
Optimized 3-port sleeve with special Speed version inner head and porting, for smoother, sharper acceleration.
Strong, DLC-coated crankshaft with silicone-filled intake passage offers improved fuel flow, and better balance for improved performance.
Ceramic crankcase ball bearing.
P3 glow plug.

 

Specifications:

Displacement: 3.49cc (0.213 cu in)
Bore: 16.3 mm (0.641 in)
Stroke: 16.8 mm (0.661 in)
RPM Range: 4,000-40,000
Power Output: 2.6 hp / 34,000 rpm
Weight: 355.0 g (12.52 oz)