Winter storage main Yamaha 4 stroke.

[Makky]

I have a 2001 50 H.P. Yamaha 4 stroke. I have heard different opinions on the proper way to treat this motor for the 6 month winter storage period. I am quite familiar with the 2 stroke motor maint of fogging etc.<br /> Does the 4 stroke have to be fogged? Should you run the gas completely out of the 4 carbs and drain them? Or treat the gas and leave it in the carbs? Do you squirt oil in each cylinder?<br /><br /> Any advice or help will be greatly appreciated. <br /><br />Thanks, Makky

 

[Forktail]

Re: Winter storage main Yamaha 4 stroke.

In my opinion fogging a 4-stroke doesn't do much. 4-strokes already have a pressurized oiling system for the valve train, etc. and their cylinders are not as exposed to the elements as a 2-stroke with piston ports.<br /><br />I treat the fuel with stabilizer, run the fuel stabilizer through the outboard, then drain the carbs. Then I squirt a teaspoon of heavy oil into each cylinder and turn the engine over a few times. Your manual will recommend the same. It's always worked for me.

 

[Oil Man]

Re: Winter storage main Yamaha 4 stroke.

You probably want to change the engine and lower unit oil before you put it away.<br /><br />Dave

 

[Makky]

Re: Winter storage main Yamaha 4 stroke.

Thanks guys. . I appreciate the sound advice. . I had been getting conflicting opinions on what to do. But it now makes sence. <br />Makky