This is a dumb question which I am known for, but just bought it with a boat, and I don't have a manual yet, and want to use it again before I get one. The question: How do you check the oil level in this engine? Do you put the dipstick fully in, or stop when it hits the rubber-like boots on the stick? (the reason for this question, besides just a reasonable maintenance check, is that I have observed quite a bit of smoke coming from the area of the exhaust when starting it in a water-tank, and some smoke when going from trolling rpms to higher rpms). I trolled about 2-3 hours with it a few days ago and it trolled fine, maybe a little fast, but did observe the smoke both when starting and some smoke when changing from trolling to higher speeds. Also a little hesitation when changing from trolling to higher speeds. Then it sat around partially tilted -- on the boat's transom, of course -- for a couple of days; and today I lowered it to the vertical position and started it in a garbage-can tank. It started on the first pull, but I observed quite a lot of the smoke upon initial starting). As a first step, I want to be sure it is not overfilled with oil. Assuming the oil level is OK, what should be the next diagnostic step? (Note that when I first got the rig last weekend, I fogged the cylinders with ONAN generator fogging oil and let it sit awhile before starting).