OSM1EG00

OS Engines MAX B21 .21 Off-Road Engine Only

$319.99
In stock
up
down

The OS Engines MAX-B21 engine is for entry-level and sports users as it is easy to use and has excellent cost performance. Based on the O.S. SPEED series engine, it has a well-balanced combination of smooth speed and power delivery and can be used in on-road and off-road racing situations.

Looking for spare parts or upgrades?

View all spare parts
 

Features

  • For 1/8 nitro
  • Can be used in on-road and off-road
  • Outer head is lighter for improved performance
  • Includes:
    • P3 glow plug
    • Reducer 6mm (Orange) and 7mm (yellow)
    • Exhaust seal ring
    • Dust cap set 3mm/16mm/18mm
You're reviewing:

OS Engines MAX B21 .21 Off-Road Engine Only

Your Rating

Product Information

The outer head is based on MAX-21XR-B VER.3 and has been reduced in weight for better performance. The shape of the combustion chamber of the inner head has also been revised to improve combustion efficiency and response in the low-speed range. In addition, more stable idling avoids stalling and equals easy carburettor adjustment.

Specs

Displacement
3.49cc / 0.213 cu.in.
Bore
16.27mm / 0.641in.
Stroke
16.80mm / 0.661in.
Output
2.6ps / 2.56hp / 34,000r.p.m.
Practical RPM range
4,000-41,000 r.p.m.
Engine Weight
361g / 12.73oz.