Does fogging ruin the spark plugs? Should I expect to need a new set next time I want to use the ski? Should I have an old set to use while fogging and swap them out for the good set when going out riding? Maybe I'm overthinking this LOL. Also is there any special procedure for starting up next time with this fogging oil in the motor?Yes, I never run my skis on the hose and only ever would if I was flushing out salt water or sand. I also never beach my skis so sand in the cooling system isn't an issue.
I don't like the hole that you attach the tube to either. How do you fog so you see it going in?Fogging oil should not foul your plugs. I fog my skis after every ride because the 951 tends to build up moisture (condensation) in the cylinders (think there is a thread on this) and couldn't tell you the last time I changed spark plugs usually every spring but didn't do it this year.
There is a small fogging port on the air box that you can connect the fogging oil spray tube, but I personally don't use it as I like to actually see the oil being sprayed.
I use a rubber hose and can direct it into the carbs. I can assure you it oils the engine quite well. I also do the cylinders as mentioned.You can't just blindly spray fogging oil into the airbox. It has to go directly into the carb bores.
The 2002+ ones actually have a tube that connects to a spray-bar that directs it into each carb.