This is O.S. Engine MAX-21XR-B Ver.Ⅲ GT Combo Set w/ TB01 EFRA2089 & MB01-75. O.S. Engines have introduced the new Max-21XR-B Ver.3 nitro engine for 1/8th Buggy and GT cars. The powerplant features a reduced piston weight for improved throttle response while the connecting rod is the same used with other Speed engines in order to improve durability. The newly designed crankshaft also improves throttle response thanks to a new countershape and timing. Always with a desire to offer more performance, the inner head features a redesigned shape of combustion chamber, improving response from low to medium speed range and achieve stable power characteristics in the high speed range. The Max-21XR-B Ver.? nitro engine comes with the double adjust J3-1 carburetor renowned for its ease of use and with two venturi inserts – a 6mm (orange) for the Off-Road class and 7mm (yellow) for the GT class. The cooling head offers a new shape and a new design. Offered as a combo package with silencer and manifold.
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
Practical RPM: 4,000 - 40,000 rpm
O.S. Engine MAX-21XR-B Ver.Ⅲ GT Combo Set w/ TB01 EFRA2089 & MB01-75 (1 set)