R90S is a horizontally opposed two-cylinder motorcycle engine model, or boxer engine.
The cylinder block is horizontal so that the cylinder can avoid the obstacle of the front wheel of the motorcycle and obtain good air-cooling heat dissipation performance.
We use precision casting for the entire engine. Every part is carefully made. T
he contours of the cylinder block and other parts of the casting process are very round, which has become the most notable feature of motorcycles in that era.
Two symmetrical exhausts are one of the hallmarks of a boxer engine.
The advantage of this model lies in its clever structural design, and each component restores the mechanical principle.
The all-metal texture is also an engine model that can be launched.

This engine model has a bore of 13MM, a stroke of 12MM, a displacement of 3.2MM, and a total weight of 1500G