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Collection, Preservation and Display of Old Lawn Mowers

Villiers MK12 no spark

 I have problem with a Villiers MK12 fitted to a Monro tiller not getting a spark at the plug. Connected the spark tester from plug cap to earth and the light flashers beautifully. Plug cap to body of spark plug light flashers as should. Plug cap to plug terminal no light. It’s as if the spark isn’t strong enough to go through the plug. Before you ask I have used two brand new plugs. Any ideas?