Update: Not too long after my last post, I started noticing compression drop in the crankside cylinder. Again, I pulled the crankside head and sure enough, it was coked. After decoking, I turned my attention to the less then ideal value seat finish I had mentioned earlier in this thread. I polished the value seat and valve mating surface using 1000 grit abrasive paper, to acheive the best finish I could by hand and eye. Afterwards I cheched sealing using compress air, then continued until I got the best result.
I re-assembled and was back up runing the next day.
It's been a month now since decoking and refinishing, and cylinder compression has remained high. I measured value lash this morning, and clearances have remained were they were set in first week of September. So after 1 month of daily runs, no measurable coking on the valve seats and hopefully problem solved. I'm still running well and keeping my fingers crossed. Anyway, I hope I'm at the point of being able to go 500 - 600 hours between decokings with two tank wvo system. Again, I'm keeping my fingers crossed.
Regarding use of acetone. My results show its use will not overcome fundamental clearance/ mating issues. Pretty much common sense. It may have allowed for easier decoking, and longer decoking intervals, with better running, when a fundamental problem existed. I'm still using it, although I have thoughs of cutting back on its use just to see what happens. On the other hand, why break what appears to be fixed.
