Getting 2 quads today that haven’t been started in 5-6 years (2005 450R and 400ex). On another thread, someone told me to squirt some WD40 down the spark plug whole to get things loosed up before starting. Then I was was told "no", don’t use WD40. I’ve read on other threads where some people put some oil in there, and just let it smoke out after a couple minutes.

So I’m really looking for what I should put in there, and how much of whatever that is. Recommendations?

As for other things, I’m all set to change oil, tranny, coolant fluids, have new air filters, spark plugs and a battery. Also will probably do some carb cleaning. So that part is covered. Just unsure on the sparkplug whole thing prep thing.