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Rotax vacuum pad gear ratio?

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rparigoris

Joined: 24 Nov 2009
Posts: 796

Posted: Fri Oct 15, 2021 11:30 am Post subject: Rotax vacuum pad gear ratio?

Hi Group I have a B&C SD20S alternator on the vacuum pad of a 914. Speed is not ideal for the SD20S, a bit too slow.



I'm looking at the parts diagram and there is a 29T vacuum pad drive gear that's driven off of a spline on the dog hub. It drives a 22T driven gear that engages to the vacuum pad drive sleeve.



From the pictures it looks possible to have a larger than 29T drive gear and smaller than 22T driven gear.



Does anyone offers such a set of gears? Thx. Ron P.

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