This afternoon I took the engine to the nearby flying field for another test run. Last week I had no luck, the engine didn’t start at all. It looks like the timing was setup wrong at 39 before TDC and I was thinking that I had it set at 27. After I corrected the timing, I was ready for the second test run. Prime the engine and it start it up with a touch of starter.

Now I think I got some tuning to do. The idle was about 3000, which I think it was too high and max RPM was 7740 which I think is kind of slow. Since it was getting dark, did have much time to deal with any adjustment. I ran the engine for about 15 mins.

Now what are some of the steps need to do to improve the max RPM and lower the idle?
Does that have to do with the ignition timing?
Any help appreciated.

Borna