Howdy, the timing marks to watch out for, is a centre punch mark on both the camshaft gear, and the crankshaft gear. These dots will be located on the side of a tooth on both gears, and are to mesh together. Once thats right, it's plain sailing. As for the carby settings, the float level is usually not adjustable, and usually all there is to do is the mixture, if your carb is adjustable that is. If it is, it's easy. I'd say wind it all the way in, then back out 2 full turns. That's normally fairly close for a Briggs, then with the engine running, wind it in so that the engine starts to die, then wind it out until the same happens, then wind it back in a little. It should run pretty sweet then. Check it by working the throttle and making sure it revs smoothly. If you haven't done it, it'd be worth cleaning out the carb while it's off.
Cheers, hope it helps.
