1985 Johnson/Evinrude 2 thru V-6 models service repair manual final edition P/N 507508, Page 88Get this manual
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TroubIe Checl Chart (t TROUBLEPOSSI BLE CAUSE
4ENGINE MISFIRES
SPARK PLUGSSee Section inn term inal damaged (terminal point ut of lead)Faul ty Ieads crossed Ieads Loose spa rk plugs