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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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No Spark On Honda 100 Outboard
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: http://data.sohc4.net/Tech/HondaMES/HondaMES5.PDF 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: 1. The proper ignition wiring is actually low tension magneto (Fig. 47) and the cap/point wire needs to be moved to the center lug. 2. 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: 3. the kill button is bad (always closed). 4. other wires may be compromised 5. 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 |
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