RE: throttle linkage on 1.6 gas
Paolo,
I don't have any photos, but the Walbro carburettor hooks up best, when using some kind of ball-joint, or ball-link setup, for the push-rod end of the throttle. The ball must be bolted onto the throttle arm of the carburettor.
You would achieve best cooling with a 16x8, or 16x10 propeller, for break-in.
For general flying, use an 18x8, or 18x10 prop.
Some other sizes would also be suitable, depending on the exhaust type you will run.