Tychoc
I know what you mean about being ready for a larger motor. I have many 40ish size motors and went to a TT GP .61. The reason is because I have a 6 year old TT GP .42 and it is probably the most dependable engine I have. Always starts easy and idles good. That is why I went with the TT on the larger motor. It, too runs excellent and idles down good. I know that they are cheap ABC engines but if I get 6 years of use out of them and it dies I feel that I well got my money's worthout of it. I also recently acquired a O.S. .91 Surpass 4 stroke with pump and don't yet know how well it well do --plenty of torque. I'm putting it on a Super Chipmunk, not in the air yet, but close. But the TT .61 is quite an engine. Rated at 2 hp and mine will pull a Razzle straight up out of sight, but I'm running a 12.25 X3.75 prop. Just my 2 cents worth.
RWCherry