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Author Topic:   1988 MONTAUK Re-power
PD2 posted 06-02-2014 04:02 PM ET (US)   Profile for PD2  
I'm getting ready to re-power my 1988 Boston Whaler Montauk and am looking at two engines. I would be interested in any feedback you might have.

One is an 2006 Evinrude E-TEC 90 hp. The engine is selling for $4,750 but after an adapter harness and labor etc., it would be about $5,885 - a guess based on the assumption of using the existing controls from my 88 Johnson that was rebuilt in the mid 90's. I'm not sure this will work and it would increase the cost if I needed to change all of that - probably another $400-$500.

The other is an 2001 Yamaha 100-HP selling for $3,950. After changing out the controls, cables etc., it would be $6,089.

bloller posted 06-02-2014 04:33 PM ET (US)     Profile for bloller  Send Email to bloller     
You should definately go with the Evinrude. Lighter and also is fuel injected as I believe the Yamaha is not. You can also get the running history of the Evinrude when hooked to a laptop. Any used motor is a crap shoot really
PD2 posted 06-02-2014 04:42 PM ET (US)     Profile for PD2    
Thanks for your response. I think the weight difference is about 50-lbs which isn't insignificant on a boat that size. I've heard good things about the Evinrude.
Tom W Clark posted 06-02-2014 05:18 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
I think you will find the Montauk floats and handles better with the lighter E-TEC 90 and it will also be quite a bit faster with the E-TEC too, especially out of the hole.
jimh posted 06-03-2014 09:40 AM ET (US)     Profile for jimh  Send Email to jimh     
An E-TEC will need the electrical harness to be of the MWS type. The MWS harness was introduced in c.1996. If your present boat rigging predates that, you will need adaptors.

To fit a 1996 or newer engine to pre-1996 boat rigging, use the Evinrude 0176345 CABLE KIT ($407). (I beleve the kit also includes the 0176362 OIL TANK PUMP KIT ($159), but check with your dealer for details.).

The cable kit will connect to the large red Amphenol rubber-shrouded connector of pre-1996 rigging on the boat side and convert to the modern MWS connector system on the engine side, where the E-TEC will then connect. The oil tank kit will change the pump and float switch of pre-1996 oil tanks to the 1996 and newer types. Since 1996, any new engine from Evinrude has needed this conversion to be used with pre-1996 boat rigging.

Evinrude in the recent past has been offering incentives in the form of substantial credits toward purchase of new rigging, and the credits have been in the range of several thousand dollars. I don't know what offers are in place at the moment. Generally the sales promotions for outboard engines are made in the winter months, to spur buyers to make purchases during the traditionally slow season for outboard engine sales. Once you get to Summer season, it is common that sales promotions and incentives will have expired.

I suggest you look into the cost of all new rigging, as it may not be any more expensive than buying the adaptors. You also may want to get new throttle and shift controls.

When I bought an E-TEC for my 1990 boat, the boat had been rigged in 1992 for an Evinrude. I used the adaptor kits to get the new engine to work with the pre-1996 rigging. I give more details about this in an article I have written. See:

Read the section under the subheading E-TEC Re-power: Installation with Existing Rigging.

jimh posted 06-03-2014 12:33 PM ET (US)     Profile for jimh  Send Email to jimh     
I don't have any feel for used engine prices, so I can't offer much advice on the relative costs of the two used engines.

From c.2008 to c.2012 I have tracked the various changes made to the E-TEC with each model year, and summarized the results in an illustrated article at

E-TEC Model Year Changes

It looks to me like a 90-HP E-TEC will not have the capability of using NMEA-2000 instrumentation if made prior to model-year 2008. Also, it will not have the newer style direct-injectors, known as the ball-in-plunger (BIP) injectors. On that basis, I believe a 2006 E-TEC 90 won't have NMEA-2000 or the BIP injectors.

PD2 posted 06-03-2014 01:58 PM ET (US)     Profile for PD2    
Thanks so much for all of the information. I appreciate it. I'll have to look through some of this to get a clear picture sorted. Thanks!
wally910 posted 06-04-2014 05:43 PM ET (US)     Profile for wally910  Send Email to wally910     
One other engine to throw in the mix if you can find one is a 2 stroke Yamaha 90. It weighs in the 260 range which is a pretty significant savings over any other 90 of which I am aware. My 1986 Montauk is powered by one and I've been very happy with it. I understand its horse power/torque is probably not that of the Evinrude, but it jumps on plane and will hit 41-42 mph with a reasonable load.
jimh posted 06-06-2014 11:05 AM ET (US)     Profile for jimh  Send Email to jimh     
More about the E-TEC:

The 90-HP E-TEC has been a very popular choice for re-power of a MONTAUK 17, and by all reports is an excellent performer. I have only a very brief experience running a MONTAUK 17 with an E-TEC 90, but it seemed like a perfect marriage of engine and boat.

I did not intend to dog the pre-2008 engines in any way. I believe the E-TEC first appeared c.2002, and by c.2008 there were some incremental changes in a few components in production. With Evinrude, there have been continuous refinements introduced, so the newest engine is always a little improved over the older ones.

The E-TEC is somewhat unique in its ability to give you an engine history report, and getting a recent history report is a very good idea when buying a used E-TEC.

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