Re: Yahama F115 4 stroke getting gas in crankcase?
robt,<br /><br />Remember, anytime a four stroke engine gains fluid in the crancase, it can only be two things.<br /><br />1. Fuel.<br /><br />3. Water.<br /><br />This is easily diagnosed by a "smell check". What does the oil smell like? <br /><br />Typically, if it's water, the oil will be "milky" and smell moldy.<br /><br />If it's fuel, it will smell like fuel.<br /><br />I would guess it's fuel. Remember, a four stroke outboard does NOT have:<br /><br />1. A thermostat with a high temp. rating that will burn off unburned fuel-like an automobile.<br /><br />2. An evaporative emission system that draws off unburned fuel (hydorocarbons).<br /><br />I think the others have made some good points about ring seating. Once you're past the break in period, this is imortant since you're also braking in the lower unit. Once past, run the daylights out of it and remember to vary your speed alot. The up and down of rpm. helps to seat both sides of the rings.