O.S. MAX SILNIK 21XR-B V3

Internal combustion engine from Japanese company O.S. Max for car models.

Crankshaft:
Newly designed crankshaft features better response compared to conventional products by changing the shape of the counter and timing.

Piston:
Better response by reducing the weight of the piston. The connecting rod is also made of OS SPEED to improve durability and reduce problems.

Cooling head:
The outer head for cooling efficiency has been laser-machined and given a new shape and design.

Combustion chamber:
The newly designed inner head has been redesigned to improve low- and medium-speed response and achieve stable power characteristics in the high-rpm range.

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

Carburetor:
Equipped with a Type 21 J3-1 dual-adjustable slide carburetor, which has a reputation for ease of use and responsiveness

Technical specifications:

• capacity: 3.49 cm3
• piston diameter: 16.27 mm
• piston stroke: 16.80 mm
• power: 2.45 hp at 33,000 rpm
• rPM range: 4 000 - 40 000
• weight: 381 g

Set includes:

• motor
• tB02 EFRA2089 (T-2090SC) muffler
• p3 glow plug
• exhaust manifold

*Follow the instructions provided with the product.