OK folks I am at the "end of the road" regarding the .82 engine. Still got 9,800/2,000 in bench test and still with rather rough running. The tick-over is nice though, had it going for some time at 1,600-1,800 but 2,000 is stable. All on 5% nitro, 5% castor, 10% ML70 oil-balance MeOH, brand new OS F plug and 13x8 prop.and large plastic spinner.
Ran the .72GK at the same time under identical conditions - even the prop nut/washer was the same.....and it gave 9,400/2,100 with much less vibrations.......sweet..!
That´s it for now from my "tinker shop"....the .82 now goes into the Kelly F1 Racer and the .72 into my Ultra Sport.60.....sack time..