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O.S. Engine MAX-21XR-B Ver.Ⅲ GT Combo Set w/ TB01 EFRA2042 & MB01-70

USD 319.90

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Tags: O.S. Engine Engine


This is O.S. Engine MAX-21XR-B Ver.Ⅲ GT Combo Set w/ TB01 EFRA2042 & MB01-70. 


  • For: 1/8 RC Nitro

  • The newly designed crankshaft has improved response compared to conventional products by changing the counter shape and timing.

  • Improved response by reducing the weight of the piston. By adopting OSSPEED connecting rod, durability is improved and troubles are reduced.

  • The outer head, which pursues cooling performance, has been laser-processed with a new shape and a new design.

  • The newly designed inner head has been redesigned for the shape of the combustion chamber to improve response in the low to medium speed range and achieve stable power characteristics in the high rpm range.

  • Two types of reducers are included, 6mm (orange) for off-road cars and 7mm (yellow) for GT cars, in order to achieve performance in each race category.

  • Equipped with a double adjust type 21 J3-1 type slide carburetor that has a reputation for ease of handling and response


  • Weight: 381g

  • Capacity: 3.49cc

  • Bore: 16.27mm

  • Stroke: 16.8mm

  • Practical RPM: 4,000 - 40,000 rpm


  • O.S. Engine MAX-21XR-B Ver.Ⅲ GT Combo Set w/ TB01 EFRA2042 & MB01-70 (1 set)

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Brand O.S. Engine

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