277 A gearbox info?

by Keith Wood in 2 Stroke Technical Questions 6 hours ago

I have a 277 on my ultralight, and am trying to hang the A gearbox.

I'm told that they don't need the spacer, but the drive gear on the engine seems to be too long, but I have a spacer that I can use.

Looking at the drive gear, the center bolt is not there.

Can someone confirm the size of that bolt? The one PDF that I've found referencing it ways that it's a 1/2-20 UNF 50 -- REALLY? An English threading on a German engine?

I ran a 13x1.25mm bolt in, and it seems to be the right threading.

One way or the other, I have to buy the bolt, but want to get the right one.

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277 A gearbox info?

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