Well, that TH .75 is actually a Super Tigre and they bought the rights to have them built in China.
It sure is one helluva engine. Been running one for about a year and it still is a powerhouse.
It even has more HP than a Fox which is darn hard to beat.

By all means, get it up to full power when you start them because you want the heat to expand the cylinder ahead of the piston. Don't run them very rich either. They must heat up or the piston/cylinder fit will be too tight and wear will take place.

3dbob