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I'm just wondering if the pulley has been put on upside down, I assume it could be done, this would mean the cutter pulley would be driving the gearbox.
G'day Norm
Maybe ... the schematic list seems to say that is possible.
['5' is the engine pulley]

My best guess, though, is that an 11hp unit complete with its pulley
were swapped with the original unit.

An 11hp unit is not suited to the colts, and I suspect the little gearbox
unit will fail quickly.

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