Scooter
I acquired a chain saw motor in great condition ( the owner had dropped a large tree on  it and the other bits were beyond repair)
What a chance to give a GoPed a run for its money
It will do 70 kph on the flat
Other parts were;
An old ladies bike
A sack barrow wheel (the tyre only lasted 50 km so a better one is in use)
A few odds and ends of steel
This is an overview of the drive system
The Primary drive is a multi vee belt
The pulleys were machined with the router
The Second stage is a single vee belt
The muffler was kindly donated by a neighbour (without it, its painfull on the ears)
A view of the second reduction stage
The small pulley was machined to press over the existing seven tooth chain drive
and then set in-place with some epoxy
To date this has not moved
A look at the fuel system
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