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940 base regina setup 900 1993

Ive had a problem w the no 4 cyl spark plug being crudded up..looks like wet grease.I once tried injecting Marvel mystery oil into the spark plug hole & let it set over nightThen I ran the engine for a while & changed the oil,..seemed to loosened the rings & ran it the next day & after a week I checked the plug & it was clean & now its 4000 ???miles later?,& the black crud is back,,Maybe its the valve seals? Guides that are to blame???






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