Thank you very much guys! Alot of helpful information!
I'm not sure if Im going to buy a tach(they cost like 140$ over here!). But I'll consider it though.
And ppk: I did not get a manual like that. All I got was 2 sheets of paper, one with a "exploded view" of the engine, and one containing a tiny engine startup instruction, and a tiny bit of tuning info. Not very helpful, and no break-in info.

About the UCD being overpowered: I bought this engine from a tip from a guy who has been flying for many years, including this plane with the same engine. So I think it will be OK

Again, thank you very much!