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A reduction drive (redrive) takes the motor's high RPM
and reduces it to a propeller-efficient RPM. There are two types of
reduction drives—geared and belted. Most geared systems come on clutched
units but a few belt systems also have a clutch. This section describes
how to rebuild a reduction drive for the Top 80 motor although many of
the techniques apply to others as well. I would welcome descriptions of
others as well and will make separate pages for those.
See also
About Clutches
& Redrives for an overview and
Troubleshooting Redrives.
Terms Overview: Prop side is the
part closest to the prop (rear) and engine side means the part
closest to the engine (front). The large gear is a one piece
hardened part that give the prop a connection spline. The small gear,
riding on the clutch bell spline, contacts and spins the large gear.
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