Right then, previous experiance of these machines i would recommend the flowing parts.
Water pump and gasket (bearings fail due to dust build up on pulley).
Starter motor and relay, bottom mast anchor rose bearings, 'o' rings for the two feed pipes into the squash plate housing.
(these are special high preasure rings)
Horn push, Key switch and hoses (you will need the mast number when ordering).
Service filters (donot clean or change the air filter until the indicator says so)
Providing you grease and carry out regular maintance these machines should give you good service.