Tips For Fogging and Winterizing an EFI Single Throttle-body Four-Stroke Outboard Engine

Fogging and Winterizing an EFI Single Throttle-body Four-Stroke Outboard Engine

If you have an EFI single throttle-body four-stroke outboard like the Yamaha in-line-four F175, the fogging and winterizing process is a bit different. Tune in, to learn how it goes. EFI single throttle-body four-stroke outboards (like the Yamaha F200 and F175), require a slightly different fogging and winterizing procedure than many other types of outboards. Unlike carbureted engines you can’t simply spray fogging fluid in via the air intake, because the oil is too thick to effectively make its way through the fuel system. Historically, that might mean removing the spark plugs and spraying the fluid directly into the cylinders. This, however, can result in hydro-lock. The answer is to be found by adding a specialized fogging fluid to a remote fuel supply, and running it directly through the outboard engine. Here’s how it works:

This is the process recommended on Yamaha’s Maintenance Matters site, which, by the way, has reams of excellent outboard care and maintenance information. But just to be sure, we contacted our insider connections at Yamaha and confirmed that this is the very best way to fog a motor like the F175.

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