Modifying The Staton Gearbox for 5:1 Gear Reduction

5-7HEAVEN

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Aug 2, 2008
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The Staton gearbox has three gearshafts inside. The first connects to the engine's clutchdrum. That shaft's gear meshes with a 5:1 intermediate shaft which then meshes with the output shaft for an 18.75:1 gear reduction.

There is only one output shaft on the older-style gearbox, either on the inside or outside of the box. Then the updated gearboxes evolved with output shafts on the left side, right side, both sides AND where the 5:1 intermediate shaft locates.

Instead of buying a newer gearbox with the 5:1 output shaft, it would seem to be a simple matter to bore a 5/8" hole thru the gearbox left-sidecover. Then you just buy Staton's 5:1 intermediate shaft with 3/4" output shaft for the sprocket.

For that matter, you could bore the opposite side cover at the main output shaft, buy Staton's later-model output shafts and convert from one-side output to dual sprockets. Orrr, converting the outside drive gearbox to inside drive. In other words, upgrading and retrofitting to Staton's newer output shafts.

I had mulled over buying another gearbox with inside drive, especially while dreaming about a NuVinci conversion. This option is WAYYY cheaper than a new box, as the Staton's output shafts are only $29.95. His gearboxes sell for $250-$280.

On paper, it seems do-able. I want to tap off my Staton gearbox for 5:1 gear reduction to run my 100-watt miniature alternator. The dynamo puts out its power at 1,000rpm, so I need to gear it down from my engine's 8,000 rpm spins.

So the BIGGG question is.....has anyone modified their Staton gearbox for 5:1 gear reduction?^5
 

5-7HEAVEN

Well-Known Member
Aug 2, 2008
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Well , today I asked the man himself, David Staton, if it was possible to retrofit his 5:1 output shaft onto one of his older model gearbox...

He said YES!!(^)(^)

As suspected, ya just have to drill thru the left-side cover and swap in his 16-tooth gearbox cog with extended shaft. No other parts needed except his $26.95 output shaft, and using the existing bearing.

I'm so happy.^5