OSMG2050 OS 21XZ-B Offroad .21 Racing Engine. The 21XZ-B delivers top-of-the-line power and performance, for far less than you'd expect. It's an ideal upgrade for 21VZ-B V-Spec users that improves torque and acceleration while weighing less and lowering the center of gravity.
 New 21J2 three-needle carburetor includes a 7 mm restrictor for fine-tuned control. Also offers improved fuel mileage and a stronger crankcase.

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: 2.51 hp @ 33,000 rpm
Weight: 12.52 oz (362 g)
Includes: 21J2 carburetor, P3 glow plug, 7 mm carb restrictor, exhaust seal and dust cap set
Requires: Glow fuel, muffler, tuned pipe and manifold