The oil pump of the PX models works speed and load dependent. The higher the speed and/or the more the gas is opened, the more the pump delivers two-stroke oil into the crankcase.
Different pump impellers are used depending on the displacement.
These are distinguished by markings on the top of the gear wheel:
1 notch = PX80
2 notches = PX125
3 notches = PX200
4 notches = PX150
The pump wheels differ by their angle on the surface, which determines the stroke of the pump. The pump impeller of the PX200 delivers the most, but is also very fat with ~1:33, even for most tuning cylinders.
The pump impeller of the PX125 delivers on average around 1:50 and can therefore also be used in larger engines without problems. It is also suitable for tuned PX80 engines with a larger oil flow rate. Their flow rate is with ~1:70 rather in the lean range.
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