How do you replace an ignition on a John Deere 16 horse Sabre ?

Hi,
It is beneath the blower housing which is the cover on top of the engine. It is held on by 4 screws, 2 at the front and 2 at the rear corners. You need to take ou the screw holding the dipstick tube and it wise to take off the cover for the starter pinion. Then there are two screw holding the armature(ignition). Sizes? 10mm - blower housing, 1/4" or 5/16" - dipstick(depends on fastening), 1/4" - pinion cover and armature. Stick a business card between the legs of the armature and the flywheel magnets to set air gap.
Peace,
Clarke