O.S. MAX-R21 On-Road

O.S. MAX-R21 - Racing Engine

Most of the parts have been newly designed based on the O.S.SPEED R2102, which is a high-end model, to achieve both the ease of handling and the high performance required of the 21 Racing Basic Engine. An affordable price is one of the attractions.
 

• The perfect power plant for rookies and club racers
• Newly developed crankshaft and piston / liner with the capability to upgrade later to a spec-class performer
• RP7 Turbo glow plug
• 8.5mm carb reducer
• Exhaust seal ring
• Dust cap set

Specs:

• Displacement: 3.49cc
• Output: 2.71hp @ 32,000r.p.m.
• Bore: 16.08mm
• Stroke: 17.2mm
• Practical r.p.m. Range: 3.000～41.500
• Weight: 350g