Of note, this is the "B" model. This is the unit currently in production, and has some improvements over the earlier ones.

The Saito FA-150B is a 4-stroke, glow fuel engine designed for 1/4 scale models. It has the same dimensions and weight as 1.20-size engines, but with 20% more displacement. The FA-150B has the following specifications:

Power: 2.5 horsepower

Displacement: 25cc

Bore: 34mm

Stroke: 27.6mm

Weight: 890g

Recommended prop: 14 x 10 ~ 16 x 8in

Cylinder: AAC

Practical RPM: 2,000 ~ 10,500