The main gear is 86 tooth. Part number 0101-046-8 Its listed as a rotor drive gear assembly

Low gear ratio tail drive unit part number 0101-057-8 drives off the main gear with a 11 tooth pinion to 2 bevel gears.

I have a complete instruction manual for the GS Baron II

Both of my gassers drive the tail with this low gear ratio unit. There is no crown gear on the main gear.

The head in the picture looks like a K-1 SB. I have one in pieces!

The original tail drive was piano wire inside a tapered boom. On my gasser I converted it to carbon tube drive inside a custom made 25mm dia. carbon fibre boom. I used Xcell drive couplings at both ends and made the boom longer so I could use 71cm blades.

If you need anymore info just shout!

Regards, Barry