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

Features:

• Lower gas use providing 8per cent longer run times versus past model, 21VZ-B V-Spec Speed
• Tough, DLC-coated crankshaft features a silicone-filled intake passage for improved fuel motion
• a lesser center of gravity provides steadier vehicle handling
• a black colored anodized crankcase with ceramic ball bearings assists in reducing opposition while increasing performance
• Unparalleled, speed-tuned energy faculties
• Race-proven 3-port sleeve with original Speed variation interior head and porting for smoother acceleration
• completely new 21J2(B) three-needle carburetor includes 6 mm, 6.5 mm and 7 mm restrictors for fine-tuned control
• Long swing allows superior torque
• Carburetor includes 6 mm, 6.5 mm and 7 mm carbohydrate restrictors to gain a competitive side!
• A P3 radiance plug provides fast, easy begins in every environment 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
• bodyweight: 12.5 oz (355 g)
• Includes: 21J2(B) carburetor, P3 radiance plug, 6.5 mm carbohydrate restrictor, exhaust seal and dust limit set
• demands: Glow gasoline, muffler, tuned pipeline and manifold