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Benelli Leoncino 125 Corsa 1955

Benelli Leoncino 125 Corsa 1955

The HP VT21 (21cc) was the smallest of the VT series which included a 49 and 61- all with a shaft-driven rotary sleeve valve. Note the vertical shaft behind the cylinder extends upward to a pair of spur gears. The large gear is connected to a vertical drum type valve that rotates through the intake, combustion, and exhaust cycle as the engine runs. As seen here the hole in the drum is half way between the exhaust and intake ports. As the crankshaft turns counter-clockwise the hole in the…

The HP VT21 (21cc) was the smallest of the VT series which included a 49 and 61- all with a shaft-driven rotary sleeve valve. Note the vertical shaft behind the cylinder extends upward to a pair of spur gears. The large gear is connected to a vertical drum type valve that rotates through the intake, combustion, and exhaust cycle as the engine runs. As seen here the hole in the drum is half way between the exhaust and intake ports. As the crankshaft turns counter-clockwise the hole in the…

Engine. Gear driven cams.

Engine. Gear driven cams.

Some sexy two-stroke goodness. Liquid cooled V2

Some sexy two-stroke goodness. Liquid cooled V2

CR110 50cc DOHC Engine

CR110 50cc DOHC Engine

manx norton - Google Search

manx norton - Google Search

Moteur V4, 32 valves à pistons ovales du Honda NR750

Moteur V4, 32 valves à pistons ovales du Honda NR750

Vincent twin motors.

Vincent twin motors.

Suzuki RG 500cc 2t

Suzuki RG 500cc 2t

Neander Diesel Motorcycle Engine.

Neander Diesel Motorcycle Engine.

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