1979 810 Models
- Disconnect vacuum switching valve green wire at connector and connect a timing light to engine. Adjust engine speed to 2500-2800 RPM and check ignition timing.
- Connect a jumper wire between Green wire connector and the positive terminal of battery. See Fig 1. Recheck ignition timing.
- Vacuum switching valve is okay if ignition timing advances 5° or more with green wire connected to battery voltage. If timing does not advance, replace vacuum switching valve.
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