Watch out for the infamous Mark 25 auto-shift feature: Start her up and idle in neutral, then it may suddenly shift into forward on it’s own, especially if you rev the throttle a bit….There are many factors involved in this, between fundamental design and worn, stuck or twisted parts. When everything is correct, this is not a problem. But just watch out for it. I always wondered if a Mercury engineer saw this happen and said, “Hey, it would be really cool if we made a motor that did that ON PURPOSE,” and thus came the Mark 10 and automatic transmission family.
Long live American manufacturing!
