09-26-2008, 11:59 AM
Your four stroke motor should run no risk of fouling plugs - it is basically just like any other four stroke engine out there and can idle indefinitely - I have a 20 HP Yamaha four stroke on my walleye boat and can putt around with it all day. My big boat has a 150 Optimax on it an I have used it for Wiper fishing in Utah once my trolling motor batteries have been exhausted (trolling at 2.5 MPH with a 20 foot boat tends to drain them in just 4 or 5 hours) and even that motor will not foul plugs. an Optimax is not a four stroke, but just like a four stroke, there is no oil injected directly into the combustion area and it is the oil in hte mixed gas of a two stroke that will foul the plugs (this was all explained to me by the boat dealers mechanic so my description may not be exact - but the point is the same - four stroke should not foul plugs).
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