Hi there! Thanks for your reply.

The engine has never run without problems in this airplane. As for whether it has run without problem BEFORE mounting in this plane - I don't know, I bought it and put it straight in this model. It has supposedly run OK before according to the person I bought it from.

Valve adjustment - I don't know, it came off eBay second-hand (but supposedly nearly new - not much running since running in) but I know that route can always be a bit of a gamble.

The prop is within the recommended range and I'm afraid I don't have a rev counter for taking the RPM.