Description:

Discontinued 

Comes with TB02 EFRA2089(T-2090SC) MB01-75

Features:

The new engine “MAX-21XR-B Ver.III”, which has the DNA of O.S.SPEED cultivated through racing, is now available for the first time in the market. It is the debut of “MAX-21XR-B Ver.III”.

• Newly designed crankshaft improves response compared to conventional products by changing the counter shape and timing.
• Lighter piston for improved response. O.S.SPEED connecting rods have been adopted for improved durability and trouble reduction.
• The outer head is newly designed and laser machined for cooling performance.
• The newly designed inner head has a revised combustion chamber shape for improved response in the low to mid speed range and stable power characteristics at high rpm.
• Two types of reducers are included to achieve performance in each race category: 6mm (orange) for off-road cars and 7mm (yellow) for GT cars.
• Equipped with double-adjustable type 21 J3-1 slide carburetor with proven ease of handling and response

Specifications:
Displacement:3.49cc / 0.213 cu.in
Bore:16.27mm / 0.641 in.
Stroke:16.8mm / 0.661 in.
Practical RPM:4,000-40,000 r.p.m.
Output:2.45 ps / 2.42hp / 33,000 r.p.m.
Weight:381g / 13.44 oz (Engine Body)

Included:
Φ6 (orange) and Φ7 (yellow) resin reducer
exhaust seal ring
T-P3 plug