I ran Seafoam and Stabil in every tank of gas I put in my boat so when it came to winterizing it I only opened up the lower unit screw to see if there was any water in it and to drain it out if there was and then fogged the engine with Seafoam fogger.

To De-winterize it I was going to change the lower unit oil, start the engine to burn off any fogger and then run it in neutral at a little higher throttle to burn off any more excess, once it was running clean turn it off and put new spark plugs in it and then I would be done.

My friend said do all of that but don't change out the spark plugs. He said the spark plugs are fine for years. I was always told to change spark plugs every year and that they were a cheap insurance policy.

How do you De-winterize your boat?

What spark plugs do you use?

**** I know some of you live in places where you don't have to winterize your boats. No wise-cracks. lol. ****

I think you are in good shape. Dont forget the plug...

 

Pretty much the same thing you do except I siphon the stored fuel into in my riding lawn mower and vehicle. Then refuel with fresh fuel, add Seafoam becuase I am not fishing a whole lot the first month of each season (March) and the fuel may sit. The last lower unit I had let in traces of water so gear lube was a two or three time of year deal, but the one I have now runs pretty tight and I only change it at the end of each season.

 

I order NGK's online as they are not really easy to find anymore in stores but only replace them when they start to visually wear. I have run Champions but their threading is cheap and the terminal loosens too easily. But havent had any perfromance problems with either. I dont replace them annually but always carry spares.

Sounds like you're spot on. It'd be a good idea to change plugs like you were thinking, especially if you motor isn't oil injected. 

Sounds like you're spot on. It'd be a good idea to change plugs like you were thinking, especially if you motor isn't oil injected. 

 

 

I'm not sure if it's oil injected. All I know is that the oil is in a tank that is built onto the motor and when it's low I fill it up. I don't mix the fuel and oil together like my older motor.

I'm not sure if it's oil injected. All I know is that the oil is in a tank that is built onto the motor and when it's low I fill it up. I don't mix the fuel and oil together like my older motor.

That's oil injection. If it wasn't, you'd have to pre-mix. It's still not a bad idea to change the plugs, but you can probably get two seasons on them if you stretch it.