O.S. Engine OS-12175 - 21XZ-B O.S. Speed Spec II Off-Road Engine  [OS-12175]

Features:

• Reduced gas usage offering 8percent longer run times compared to the former model, 21VZ-B V-Spec Speed
• Tough, DLC-coated crankshaft features a silicone-filled intake passage for enhanced gas movement
• A diminished center of gravity provides steadier vehicle managing
• a black anodized crankcase with ceramic ball bearings helps reduce opposition and increase performance
• Unparalleled, speed-tuned energy characteristics
• Race-proven 3-port sleeve with unique Speed variation 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 side!
• A P3 glow plug provides quick, effortless begins in most climate conditions

Specs:

• 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
• Body weight: 12.5 oz (355 g)
• Includes: 21J2(B) carburetor, P3 glow plug, 6.5 mm carbohydrate restrictor, exhaust seal and dirt limit set
• Requires: Glow fuel, muffler, tuned pipe and manifold