O.S. MAX R21 V2 1F400

The O.S. MAX R21 club-level nitro on-road engine.
The power plant targets club level drivers and it features compatibility of sparepart of the R2106.

Whats new on Max-R21 Version 2?

Crankcase are from R2106

Crankshaft has 3 bronze counterweight better low/mid range speed feel and easier to handle.

New outer head has better cooling with new laser design.

Inner head are similar O-ring type used in R2106.

Carburetortype 21M4 which is same as R2106 for easier to adjust and more room for adjustment.

 

Standard accessories

RP7 glowplug

8.5mm venturi(purple)

Exhaust seal

Dust cap set(3/16/18)

Tech specifications:

Displacement: 3.49 cc

Bore: 16.08mm

Stroke: 17.20mm

5-port/3 M.E.S.

Practical RPM range: 4,000 44,000 rpm

Weight: 340Gr