Working on the wheels and axles, I like the old rover cast wheels very strong and more than likely out last the rest of a rover mower in the day...The 5hp briggs is just about done as well its a big engine...The old briggs and stratton engines have grown on me after working on a few I like them they are easy to work on parts are cheap and there is a wealth of information on the net about them on the karting forums and such...few pics Cheers