Well, it happens with new motors too. I have a 2002 Merc Opti Max, 225 hp. It too is a very cold natured motor, but once it is running and warmed up, it is great. However on cool days, it will get cold natured again if I fish long enough without using the large motor.

One other thing that I think hurts mine is that I haven't really fished that much this year, and I think my gas tends to get old. I use stabilizer, but still, when you have a 56 gallon tank, and if you are not fishing a lot, and not careful, it is pretty easy to end up with old fuel.

Oh yeah, the primer bulb tip is a good one. I was told with the opti I would not need to prime my motor anymore, well, it does help.

Good luck,

Danny