I'm looking at an older Monark jon with a Johnson motor on it. Motor is newer than the boat. The serial # is E4851083. I assumed this meant it was probably a 1983 model, but the guy who owns it is sure it was an 87 or 88. Anyone know for sure? He bought it from the original owner who was paralyzed in an accident a few months after he bought it, and has only run it maybe a half dozen times since he has owned it. He replaced the impeller a couple years ago, I took my muffs down and tried it today, it popped on the first pull, started on the second and ran like a champ.After it warmed up a bit, I stopped and started it a few times, and it always started with a half pull. Anything I need to watch out for? I'm not gonna commit till I can run it on the water, but it looks good so far. It's a 15 horse, by the way. Also, I assume it is a 50:1 gas/oil mix, is that correct? Thanks for the help.