G'day From the photo I think you have one of the older Mk 2 Saito 45s. This is the earlier "low cam" version and the same as the one that I have. This will need a light model such as the Sig LT 25. Anything larger or heavier will probably be a bit too much for it. As I said before, my original Sig Kadet Senior would not fly with one of these engines but would fly (just) with an OS FS 40. It used to fly well on the later 45S Hi Cam engine and it is possible I believe to fit the cam from the later engine (which is used in several of the smaller Saitos) but I have not done it.

Frankly, I would be looking for a later, more powerful engine. The other problem for this engine is that should you have a prang (and prangs are pretty common when you are learning) you may damage the engine and the usual things that get damaged are the carby and its mounting on the rear cover plate. These early engines had quite a small mounting with just one bolt holding the carby in place. I have managed to break several of the later "two bolt" types as in a prang, things come flying forward and hit the back of the engine bending needle valves, spray bars and crushing the inlet tube. You might be better to hang on to this engine until you are more competent then put it in a small scale model or powered glider where its relatively modest power output would not be a problem.

Sorry to be the bringer of not so good news.