See full version: Should i run the gas out of my outboard motor
c. On the flip side – Under-propping a boat and allowing the engine to spin above the manufacturer’s recommended RPM range is just as harmful. Those poor metal parts will be pedaling away furiously as the engine over-revs. Again, the potential for an early engine grave is obvious.
Outboard engines run continually at high RPMs, much higher RPMs than cars or trucks. With 4-stroke engines keeping fresh, clean oil in the engine becomes of paramount importance and changing the oil filters each and every time will help keep the oil that much cleaner. [links]
3. Flush After Each Use here
1. Get the Top End Right
4. Another thing you can do is disconnect the gas line, or turn off the gas valve, while the motor is still running and let it run dry to use up all the gas in the engine and not have gas separating in the engine. Check with your dealer to see if it's recommended for your engine. Mine was happy with this procedure. [links]
When water is in the gas it makes the motor run rough and cut out, idle badly particularly at low speed, causes corrosion and damage, and can make a motor hugely difficult to start. more
4 Stroke engines are trickier than the old reliable 2 strokes. They need to be properly maintained, with good spark plugs, and fresh gas as much as possible. [links]
2. Use a gas stabilizer. There are countless versions available. Ask you outboard dealer what they recommend. Use it religiously. here
A large proportion of the problems reported is due to the tendency of Gas/Alcohol blends to separate. It's referred to as Phase separation. Also the gas/ethanol absorbs water and when it separates the water residue can corrode, rust or damage engine parts. Damage to rubber, plastic and fiberglass is widespread. This corrosion creates further residues which can gum up and block valves and openings. Carburetors jets can be affected by this. The gum and varnish can coat engine parts and reduce performance. The compromised gas/Ethanol can also interfere with the lubrication of the 2 stroke engines.
This is a very broad subject because different engine models have different injection systems that require different actions (we'll also assume the boat is in regular use and not being winterised).
The really short answer is that it depends on what sort of motor it is - so always refer to your owners manual from the manufacturer.
In summary - regardless of your engine make/model we always recommend reading your owners manual to make sure you're maintaining it as recommended by the manufacturer. Different brands, models & size engines require different treatment so that is the most reliable source of advice.
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