Help with winterizing

AQUADJ

Seaman Apprentice
Joined
Nov 11, 2005
Messages
40
I am attempting to winterize my 1998 Yamaha 250 hp OX66 EFI for the first time. I'm familiar with the procedure but I'm not sure about spraying the fogging fluid. If I remove the silencer from the motor, will that expose the injectors and will the motor continue to run? Thanks for the help.
 

yamamarinetech40

Petty Officer 1st Class
Joined
Dec 17, 2006
Messages
328
Re: Help with winterizing

AQUADJ,
It's really easy, so here ya go. Just remove the silencer, you will expose the throttle bodies, these will look kinda like carb throats, with the butterfly valves....get the water connected(always on muffs to run, NOT the hose connector) and after it runs a couple of minutes, get it up to a fast idle (1400-1600) RPM. Helps to have somebody on the trottle. On the can(of Yamaha Fogging Fluid), it tells you the amount per liter of eng. displacement, then you divide that amount of spray time by six(cylinders) and spray each intake(should be 20 seconds or so, maybe 30). Rotate thru all the cylinders for say 5 seconds on each until all have the 20 to 30 seconds of time each(six times thru)x(5 secs.) and then just chop throttle to idle, spray quickly around thru cylinders till engine bogs and dies....thats fogged. You can then pull each sparkplug and just give a little shot into each, letting threads of plug hole catch a little. Don't forget to grease propshaft, steering, and t-9 the engine real good(wet 'er down, won't hurt only help) and treat the gas.
 

AQUADJ

Seaman Apprentice
Joined
Nov 11, 2005
Messages
40
Re: Help with winterizing

yamamarinetech40,
Thanks for the info, I should be set now. One more question regarding running on the hose connector. When I pulled my boat out of the water last week, I flushed the motor for 5 minutes through the hose connector while running at idle. What damage might I have done?
 
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