One thing that really impressed me, once I opened it up, was the size/massiveness of the bearings... HUGE ball bearings for the crank mains, and generally just really strong stuff...
'course shoulda know that from the heft of the engine/gear... that sucker is seriously heavy, they packed a lot of gravity into those cases!!
If you look at the middle, towards the bottom of the row of gears, you will see some dark grey and broken... that was the problem:
The beauty of this design is that, once the cases are split, all of the bearings/gears are just laying there, easy to pick up and take out...... no shimming and all the precision stuff (NOT my strong suit!)....
These are the busted/broken/nfg parts:
So I did a search of eBay, and again, one of the blessings of XS is that they made a bootload of them, and parts are available for very reasonable prices. I found a full set of gears for about $50, shipped... hard to beat THAT!
Nice, eh? They fit and work perfectly!