OS Engines Max R21

OS Engines

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Premium power, entry-level ease.

Club racers rejoice! The R21 engine delivers an unbeatable blend of power and value for 1/8 on-road racing. Its crankshaft and piston/liner are designed with premium performance and easy maintenance in mind, which makes it an ideal choice for beginners. Best of all, they can be upgraded with O.S. Speed parts when you want to step up to Spec-class competition. High performance. Low price. That’s what you can expect from the R21, only from O.S.

  • The perfect power plant for rookies and club racers!
  • 8.5 mm carb reducer.
  • RP7 Turbo glow plug.
  • Dust cap set.

Technical Specifications:

Displacement: 3.49cc

Carburetor Type: 8.5mm Slide

Material: Aluminium

Adjustment Needles: 3

Glowplug Type: Turbo

Exhaust Position: Rear

Fuel Type: 25% (Recommended)

Bore: 16.08mm

Stroke: 17.2mm

Pratical RPM: 4,000-44,000

Output: 2.71hp @ 32,000 RPM

Weight: 350g

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