It is important that the insolation be clean. dirty insolation bleeds the charge out of the capacitor reducing ignition output. (Just like leaking insolation in the capacitor.) Many find a breaker point file awkward to use. The sand in sand paper is silicone dioxide, an insulator. Follow up with a 600 grit wet-or-dry paper (which is bonded tungsten carbide) lubricated with WD40, followed by butcher paper to leave a clean surface. Some use a business card for the increased stiffness, but some of these cards use titanium dioxide as a whitener, which is also an insulator.
If the oil (grease prefered) gets into the water pump, it can cause the rotor to swell. This decreases the amount of water pumped and engine overheating. The models HD and TD have the carburetor by the exhaust manifold and overheating will cause vapor lock in these models.
If you run into carburetor problems, this will help –
That was one of Johnson’s largest selling outboards. . . 🙂
