G'day all - just pulled a very old and jail most completely rusted muffler out of a 61202 and would like to know the thread size so I can give the port a bit of a go over before fitting a new muffler. Thanks and have a great day.
Those internal exhaust port threads are NPT (National Pipe Thread), taper-type. Remember that pipe threads are classified by the inside diameter of the water pipe a male thread would go on the outside of, so the official tap size will be smaller than the actual diameter.
