PatrickMonahan
Member
I cleaned the sparkplugs of oil on my mariner and it ran great for a minute and then eventually bogged down, could this be linked to a faulty thermostat that is stuck open because the back of thge engine is coild to touch, could that affect the air fuel mixture becuase its so cold and dampen and cover the sparkplugs in oil and therefore bog the engine down? Any experience? any other reasons why the spark plugs oil up quickly and easy, was running cold today, still have to look at the thermostat, should the back of the engine be warm to touch when it is running hard ? the spark plugs are new and are ngk, could running cold stop it from running correctly at high revs, thanks for your help,