Unlike modern cars that use a fuel injector connected right to the cylinders of the engine, scooter oil injection needs to be mixed with the fuel before it goes into the engine. Scooters have historically used the engine power and its fluctuating speed to dictate how much oil is injected as fuel is drawn upon.
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Scooter engines require engine lubrication be mixed with the gasoline to lubricate the piston as it moves inside the engine cylinder chamber. Failure to do this will result in friction, which in turn causes the engine parts to grind and break. Most scooter systems use a pump approach to move the oil into the gasoline flow commensurate with the speed of the engine and fuel demand.
Vintage scooters use the mechanical design of rotors to propel oil into the fuel for mixture. The speed of the engine dictates the speed of the oil pump rotor, which in turn adds more oil as the engine goes faster.
Trigger Linkage Approach
On some modern scooters the injection design involves a link arm connected to the scooter throttle. As the throttle is pulled via the throttle cable, the link is activated, opening up the oil flow to the engine. When not running, the linkage is in a full "stop" position, cutting off all flow.
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