The SP Series from Subaru utilizes a high-performance automotive design. The engines feature chain-driven OHC technology combined with an efficient hemispherical combustion chamber for optimum engine performance. Intake and exhaust valves are positioned to lower resistance for the air/fuel mixture, while a high compression ratio produces greater power and torque.
- SP170, 5.7 hp, 169cc displacement (pictured)
- SP210, 7 hp, 211cc displacement