1969 Minot 16 Re-power

Optimizing the performance of Boston Whaler boats
Hornet
Posts: 3
Joined: Tue Jul 30, 2019 9:45 pm

1969 Minot 16 Re-power

Postby Hornet » Tue Jul 30, 2019 9:55 pm

I plan to re-power a 1969 MINOT 16. This MINOT 16 has its original Chrysler 85-HP engine.

I have looked at old posts.

I plan to buy a Yamaha F70.

Is there a better choice [for a new engine other than a Yamaha F70] for this older lightweight [MINOT 16] hull?

This MINOT 16 will be used mostly for fishing in a bay and on a good day I may go four miles in the Gulf.

jimh
Posts: 11673
Joined: Fri Oct 09, 2015 12:25 pm
Location: Michigan, Lower Peninsula
Contact:

Re: 1969 Minot 16 Re-power

Postby jimh » Wed Jul 31, 2019 8:15 am

You should prefer the newer Yamaha F70A engine over the older F70 model.

The F70A weighs about 262-lbs with a propeller and has a 1.0-liter displacement. Yamaha has been able to reduce the engine weight on this model to a rather amazing figure.

An alternative choice might be an E-TEC 75 or 90-HP, but they weigh 320-lbs. The E-TEC 75 or 90 have 1.3-liter displacement, and they would be a more powerful engine than the Yamaha F70A.

Give serious consideration to the dealer you will buy from. All engines need some after-sale support, and a strong dealer, someone who has been selling an engine brand for a long time, with excellent service facilities will be a factor in your decision on what engine and from whom to buy.

Hornet
Posts: 3
Joined: Tue Jul 30, 2019 9:45 pm

Re: 1969 Minot 16 Re-power

Postby Hornet » Wed Jul 31, 2019 8:38 am

Do you think the E-TEC engine would be too heavy?

Are the E-TEC engines as reliable as a four stroke?

I am not sure of the weight of the original motor.

biggiefl
Posts: 897
Joined: Thu Jul 11, 2019 1:31 pm
Location: south Tampa Bay area
Contact:

Re: 1969 Minot 16 Re-power

Postby biggiefl » Wed Jul 31, 2019 11:15 am

If you are happy with the performance of the Chrysler, the F70 ill be plenty. That hull can handle the weight of an e-tec and more, but, again, if the 85 satisfies your needs.
On my 24th Whaler. Currently in the stable: 86 18' Outrage, 81 13' Sport(original owner), 87 11' Sport, 69 Squall(for sale cheap).

Hornet
Posts: 3
Joined: Tue Jul 30, 2019 9:45 pm

Re: 1969 Minot 16 Re-power

Postby Hornet » Wed Jul 31, 2019 4:29 pm

Thanks for your response, the original 85 did a ok on performance but it's time for an new motor. But this boat has been sitting for many years and the local mechanics said they can't repair the motor.

jimh
Posts: 11673
Joined: Fri Oct 09, 2015 12:25 pm
Location: Michigan, Lower Peninsula
Contact:

Re: 1969 Minot 16 Re-power

Postby jimh » Thu Aug 01, 2019 9:52 am

The legacy E-TEC three-cylinder engine has been chosen to re-power many 16/17-foot Boston Whaler hulls. Usually the 90-HP model is used, but the 75-HP model is less expensive and only has a few less ponies. I’d say the “90” is probably an 87-HP and the “75” is probably a 79-HP.

These E-TEC engines were very popular, but makers of four-stroke-power-cycle engines worked hard on reducing their weight, and there are now alternative choices.

There are two-stroke-power-cycle outboard engines that are over 40-years-old and have over 4,000-hours of runtime. There is nothing intrinsic in a four-stroke engine that assures long service life.

whalerron
Posts: 19
Joined: Sun Mar 06, 2016 8:31 pm

Re: 1969 Minot 16 Re-power

Postby whalerron » Fri Jan 31, 2020 10:16 pm

I re-powered a 1969 Minot with a 2001 Johnson 90-HP two-stroke-power-cycle outboard engine that weighed about 320-lbs. The engine was a match made in heaven for the MINOT 16.