O.S. Max-25XZ Truggy engine

New from O.S. Engines is the Max-25XZ Truggy Engine, that utilizes the best balance of power, fuel mileage, size and weight within ROAR regulations to give racers optimum performance at 1/8 truggy and stadium track events. This motor is designed to have more power than .21 class engines, yet less than the .28 class, for better fuel mileage, lighter weight and lower centre of gravity. The supplied double adjustable type carb gives smooth acceleration from low, mid and high speeds.

Specifications:
Displacement:  4.09cc (0.25cu.in.)
Bore:  17.5mm (0.689in.)
Stroke:  17.0mm (0.669in.)
Practical RPM:  4,000 – 39,000 rpm
Output:  3.1ps/33,000 rpm
Weight:  13.05 oz. (370g)

Source: OS Engines [osengines.com]