Nick, LOL! I had my "moment",(one of my many) when I redid my 128. I went to fire it off, started on the 3rd revolution but was breaking up off idle. After checking and rechecking timing, carb settings, and gov and some beverages, followed by some words. I went in the house and checked the wiring diagram. I felt pretty low, when I found that I had the condensor wired to the wrong side of the coil! That was an easy fix, but I had thought the worst after having the engine apart. Switched the wire, runs like a champ.
Can ya snap a few shots of her rear when you take her apart? It seems I have seen the rear cover off every hydro, but few gear drives. The cover on mine has never been off, just curious!