mgg wrote:


"Larry" wrote in message
...
A fishing buddy of mine is re-powering his early 1976 Boston Whaler
Sport 15 with a new 60hp 4 stoke Mercury. He is replacing a 2 stroke
Mariner that is an 80's model.

He has no gauges and the layout of the console is like a skiff - the
steering wheel is horizontal. He's not concerned about a
speedometer, and shouldn't be, but I think he should have a tach.
The 4 stroke will be heavier and act differently than the 2 stroke.
The props are interchangeable in size and hub configuration so he
plans on putting his SS prop on the new boat. I'm trying to convince
him to find, or make, a spot for a tach so he can make sure the boat
is propped properly (say that 5 times fast!). He's not convinced.
The boat is rated for a 75 so the 60 will still weigh about the same
as a 75 2 stroke so the transom weight will be fine.

Has anyone attempted a similar replacement? Should he need a
different prop? Can you attach a tachometer temporarily for testing
purposes?

Thanks in advance,
Larry

Sure, you can hook up a tach temporarily, but he may as well do it
right. There is no way he is going to get the prop pitched properly
G w/out a tach. And, he needs one he can see at WOT... not clamped
to the transom "temporarily." It's not a hard gauge to install at all.

---Mike
I agree. He's had the Mariner forever and it's worked fine. He doesn't
think the 4 stroke in the same size will be much different.

Thanks,
Larry