This is my first sts engine and ran it in two weeks ago. very fine made. you need longer time to run in the engine as piston/sleeve are tight when new. I spent 1/2 days to run in the engine and I think I need to take more time to work on it.
spent around 10 tanks on starter box with very rich needle and then ran it on track without kick in 2nd speed for another 6 tanks. the speed is merely similar to a EP TC at 23T
leaned up the needle gradulately and seems the engine has very good power. bottom end is mild but power which could be the reason of 6.5mm carb. Very smooth power band. an engine with very good potential. I think i need to gear it down a bit on the 2speed to get every juice out of it on the next RC day. we will see.