Yamaha 150hp, Air Intake and Rain

BrAinZ · 26 July 2009, 22:36

We've got a new Yamaha 150hp engine, and reading through the manual says to wash the engine off after use with fresh clean water, but it specifically indicates to avoid the air intake.

We currently leave the engine in the raised position, and it made me wonder whether there would be any issues with rain water going directly into the air intake.

Should the engine be left in the raised position or "down", and should I worry about any rain water getting in the air intake?

Nos4r2 · 26 July 2009, 22:45

Don't worry about rain-the intake is made so it won't get in.

Large amounts of water directed in there from a hose may though-hence the warning from Yamaha.

outboardtech · 27 July 2009, 10:24

dont even worry about that at all .

BrAinZ · 27 July 2009, 22:35

So is it correct to leave the engine in the up position when storing?

DJL · 27 July 2009, 23:20

If you can its better to leave then engine tilted down to allow water to drain from the power head/leg - especially in the winter when the water could freeze. Obviously you can't do this if the boats in the water.

Having said that, I wouldn't worry about water entering the air intake on the cowl. The air has to take a fairly roundabout route to get in, specifically to stop water getting in - the F150 cowl also had water drains in the intake, you can see the hoses on the underside of the cowl.

BrAinZ · 31 July 2009, 09:02

Thanks for the advice everyone.

Good point about the winter.. don't want anything freezing in there, so may leave it down then.

Bushrider · 05 August 2009, 18:57

Hi ,
My F100D is when not utilized always covered with a soft cover from Yamaha .
Takes just a minute to pull it over and I don`t have to worry about any rain / water , dirt , wesp nests , or others ... and it does not matter at all whether the engine is up or down .

Regards - Jurgen