Supposedly the 9.9 hp engine is 34 years old and the original coil is no longer made.
When I saw it the ignition system was wired up "energy transfer" like in Fig. 48:
Some laminated cube on the center lug on the coil _may_ be an insulator to the engine mounting. If so then there are two theories:
- The proper ignition wiring is actually low tension magneto (Fig.
- The coil is for another application and the center lug needs to bypass the insulator be wired to ground.
The engine was the abode for a family of mice who ate through the cap/ point wire and made a mess so there are other theories on why there is no voltage in the secondary:
- the kill button is bad (always closed).
- other wires may be compromised
- the points are set at 0.017 which may be a little high (always open)
The coil seems to have ball park range resistances, 0.75, 3 and 30K ohms. The condensor seems to have some effect on an analog voltmeter when tapped with a DC voltage. When cranked the low voltage magneto coil puts out a few volts on the multimeter.
In all systems the crank shaft must be aligned/timed with the cam so that will probably be the first thing to check. At TDC the little round impression timing mark can be set for either the side with a similar mark or 180 degrees as it's a wasted spark system. I'm still not sure how to get it exactly right. The flywheel has 4 magnets and it's hard to guess the exact phase angle.
Should the points first open up about 10 degrees before TDC (one belt tooth spacing). There is a centrifugal advance.
Bret Cahill