I only own three IC engines at the moment, 2x Fox 2-c and 1 Saito 4-c. By far my favorite is the Saito. Planned purchases for the future are almost all Saito 4-cycle engines. There's just something about the sound, ease of handling and sheer pull these engines have that makes all others pale by comparison.
lets see i own, 2 saito's , a few super tigre (italian ones) one thunder tigre (did not run that on yet) about 15 or so OS in particulair the 10 fp series and a few sf series. and about 80 COX as a result of a collection. Engines that get the most actual use are the OS ones.
Btw exept for a 40sf bought about 20 years ago and a saito fa 65 all my engines are second hand,.
"Unfortunately I've had to pay for all the engines I've reviewed so far"
I know that feeling. Fortunately I have been able to foster a relationship with the SIG company and we are on good terms. I just wish I was better at building , they have a new 4 star .20 kit that I am dying to try out.
I've been putting an MVVS90 2st to some use this last week, what a lovely handling engine it's turned out to be! Very low reliable tickover, plenty of guts with a smooth and linear throttle response, and it's happy turning anything between 13*8 and 15*6. With a genesis pipe, it's really quite, much quieter than my OS61FSR on a 12*6.
People do some crazy stuff with SIG Wonders. Even as far as putting a Norvel 40 on it. Love those Norvel 40s too. Good power to weight ratio. Perhaps mine will fit my Kadet JR? A Wonder with a tiny little pulsejet, I love it!! And with the split tail. its a natural!