SaCCal 72
i believe the power is the same but the weight is lower because you eliminate the fly wheel and mag ,therefor you get a better power to weight ratio,maybe a little more power.still a lower weight at the same power setting is just like adding more horses.
WOW,7700 rpm's thats pretty darn good ,did you run it as a weed wacker before conversion,or was that the first run? mine turned7500 rpm's at the end of it's first tank on a 18x6 unbalanced zinger ,I did not run it as a wacker and i have not optimized the timing yet. so it's still breaking in . got to seat those rings! I also need to get a bigger carb ,i'm using an old stock carb that i had from an engine that I scrapped (no more chrome on the cylinder) and i think it was a 28cc eng. so it might be small Idont know for sure.
engine #2 is still in the process, it will get the non advance ch unit ,alltho ,I may make a mechanical advance for it .the ch unit on engine #1 is actually for my previosly converted homie 45cc in a scratch built EDGE 540. 84" wing ,carbon fiber fuse ,but it came out tail heavy so i'm stuck with the mag ignition and used the ch on my ryobi ,it was my first laid up fuse ,might be my last . this one (RYOBI) is going in a yak 54 arf ,that edge flys real nice but it took 3 years and 2 attempts to complete, so now we'll do some arf's. I want to get a giles or something for eng.#2eventually.right now i'm building my son's trainer so time is an isue i'll do my best to post performance numbers as i run it , and make changes, i plan to modify it some so we'll see what it'll do