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O.S. Speed 21XZ-R is a high performance engine designed expressly for 1/8 On-Road Racing. Based on the MAX-21XZ-R, major parts have been refined to have a powerful potential equal to more expensive specially tuned or modified engines.

Specifications:

• Displacement: 3.49cc
• Bore: 16.27mm
• Stroke: 16.8mm
• Practical R.P.M.: 4000-45000 r.p.m.
• Power output: 2.8ps / 2.84 hp / 33000 r.p.m.
• Weight: 338g