Keith Posted September 19, 2019 Report Share Posted September 19, 2019 Grob 109 B Sparkplugs. Bosch have stopped producing the WC7D shielded spark plug and they are fast becoming unavailable. Has any one found an alternative plug or converted the ignition harness to use auto style plugs, Quote Link to comment Share on other sites More sharing options...
Desmond Barry Posted August 19, 2020 Report Share Posted August 19, 2020 Hi Keith did you find a solution to changing the harness? If so what plugs did you then use? If not what plugs did you find were suitable? Desmond Barry Quote Link to comment Share on other sites More sharing options...
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