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

Features:

• Lower fuel consumption offering 8% longer run times than the former model,
  21VZ-B V-Spec Speed
• Tough, DLC-coated crankshaft features a silicone-filled intake passage for
  improved fuel flow
• A lowered center of gravity provides steadier vehicle handling
• A black anodized crankcase with ceramic ball bearings helps reduce resistance
  and increase performance
• Unparalleled, speed-tuned power characteristics
• Race-proven 3-port sleeve with special Speed version 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 edge!
• A P3 glow plug provides quick, easy starts in all weather 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
• Weight: 12.5 oz (355 g)
• Includes: 21J2(B) carburetor, P3 glow plug, 6.5 mm carb restrictor, exhaust
  seal and dust cap set
• Requires: Glow fuel, muffler, tuned pipe and manifold