Alright... believe or not, I just finished reading the entire thread! Started a week ago, reads like a real thriller
I’d like to thank all the contributors like cathurga, elmshoot, JieM, and all the others. Learned a lot about the inner workings of that sweet little engine

Mine is a 2018 version and presently mounted on a Hangar 9 Ultra (iso Super… ) Stick for running-in and testing, no mods on a MRS collector ring. Pushing 15 flight of 10’ minutes on mine + about 40' running-in, no problems, yet… fill the tank with the elec pump, a finger on the tank overflow for a few seconds, and it starts on 1-2 flips everytime. Once warm, 1 flip is enough.

Since it was running too well, decided and ordered the MMM ignition ring, which I installed yesterday, yet to test. Measured advance was, in line with others, 45° on #1, now corrected to 30°. Thinking about the intake mod... you guys have me spend more $$$