This weekend the Pro50 developed loss of power. After inspecting the spark plugs for fouling, the center plug was found to have a closed gap. Could see no damage other than the closed gap. Re-gapped the plug and put in top cyclinder, placed plug from top cylinder in middle cylinder. Motor ran fine for a couple of hours and then lost power again, same situation on center plug, closed, no damage to spark plug other than being closed. No damage evident to pistion through plug hole.<br /><br />Any ideas on how a plug cap can close?
