"Hi Mark, I have a '84 85h
"Hi Mark, I have a '84 85hp and yeah they are troublesome motors. I do however have one in pretty good shape (i.e. well taken care of) and I adjusted the carbs and it stalls less. A couple other tips that work for mine: Keep the screws on top of the gas tank open. Keep the 50-1 ratio as close as possible. Seat idle screws and then back out 7/8 of a turn (factory spec on mine and probably yours too).
Lastly, a couple of guys respond on this site and really know what they are talking about: Just-In-Time and Graham Lamb. If they write back to you my suggestion would be to follow their input. Both have helped me."