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Author Topic:   Re-Powering > 16'7" Boston Whaler
Roscoe posted 01-25-2003 12:31 AM ET (US)   Profile for Roscoe   Send Email to Roscoe  
Highs and Lows of the Mercury 90hp 4stroke vs. Mercury 90hp 2 stroke. I was shying towards the 4 stroke, but would appreicate any Info.Thanyou.
JBCornwell posted 01-25-2003 08:17 AM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
We did not like the 90 2S that was on son's Montauk.

It was noisy, chronically rough at idle and would not troll for more than a few minutes without loading up.

Off idle it performed well and reliably.

I am completely sold on 4 strokes, but would hesitate to buy a carbed engine in a size range that had EFI engines available.

You might be surprized at the performance available in 60 and 70HP EFI 4 strokes. Merc has an EFI 60, and I am very happy with the Suzi DF70 on my Montauk.

Red sky at night. . .

rwill1 posted 01-25-2003 10:04 AM ET (US)     Profile for rwill1  Send Email to rwill1     
Consider the 90 HP Johnson V4 2S. More displacement(torque) than the Merc, idles well, priced right. Best bang for the buck.

I think 90 HP 4 strokes are too heavy for the 16 foot hulls. Just an opinion.

weekendwarrior posted 01-25-2003 10:55 AM ET (US)     Profile for weekendwarrior  Send Email to weekendwarrior     
I am sold 100% on 4s. Quiet, no smoke, perfect idle, great gas mileage. Mine is carbed (not EFI) and I've used it year round for the last few years and so far zero complaints, though I would certainly not discourage EFI.

I know the hull is rated for 400# motor, but with our 200# motor plus our 22gal livewell full in the back, the boat is noticeably back heavy and rides a bit rougher in the chop. If the 2s vs 4s weight difference is significant then maybe this is something to consider. I don't know what the difference is in weight for that size motor.

masbama posted 01-25-2003 06:04 PM ET (US)     Profile for masbama  Send Email to masbama     
My buddy has a 90hp Merc 4 stroke on his boat. It looks HUGE! It starts right up and is quiet at idle but once going it is about as loud as other motors. He is on his third prop because the hole shot is awful. It also makes clanking noises when put in and out of gear. Not impressed. Get a Johnson 70 4 stroke or any 2 stroke 90 before this one.
rwill1 posted 01-25-2003 07:08 PM ET (US)     Profile for rwill1  Send Email to rwill1     
JohnnyEvinZuki DF70 seems to be highly regarded if you want a 4s (Still heavy in IMHO). However I saw on another site a discussion of oil pump/camshaft failures. Any comments?

[Removed dead link]

Landlocked posted 01-25-2003 10:14 PM ET (US)     Profile for Landlocked  Send Email to Landlocked     
Couldn't be happier with my 90 merc 2stroke. Idles smooth enough for me, runs quiet and in the low 40's gps. Do a search and you'll find a thread from last spring that deals with my decision to repower with a merc along with some performance data.


Roscoe posted 01-26-2003 02:10 AM ET (US)     Profile for Roscoe  Send Email to Roscoe     
Looks like as far as the posts go it may be a toss up of 2s vs 4s? Both having different positives and negetive factors to digest.I will look into the weight diff. as I didnt even consider that point.Thanks for the Replys and I will look at the Evin/Johnson too.
RWM posted 01-26-2003 09:59 PM ET (US)     Profile for RWM  Send Email to RWM     
2001 70 HP Suzuki new...
[Removed dead link to eBay auction]
newt posted 01-27-2003 12:55 PM ET (US)     Profile for newt  Send Email to newt     
I'm with Landlocked. No problems with my Merc 90 2s, but then again, I have not spent much time on any boat with a four stroke.

I don't troll much, but I do go through tons of no-wake zones, and have never had a problem with fouling. Maybe it's the spark plugs. I run the factory recommended NGK's.

kamml posted 01-27-2003 07:17 PM ET (US)     Profile for kamml  Send Email to kamml     
My 2002 90 Merc 2s is a great motor. It is loud at throttle, but reasonable on gas, no hassle oil injection, light weight and very quick to plane and on top end in the 40s. No problems with idle or trolling speeds either. Ken
Roscoe posted 01-28-2003 01:39 AM ET (US)     Profile for Roscoe  Send Email to Roscoe     
No recent purchases on 4 stroke ? Sounds like everyone loves the 2s! I still have top find the weight diffs.
Perry posted 01-28-2003 12:16 PM ET (US)     Profile for Perry  Send Email to Perry     
I have a 2002 Honda 90 on my Dauntless 16. It runs smooth at all throttle positions, it is very quiet, get's excellent fuel economy but a little low on torque. With the right prop it has a decent hole shot and top speed of around 40 mph.
seasicknes posted 02-05-2003 11:48 PM ET (US)     Profile for seasicknes    
Looking at the mid range hp specs from the different manufacturers it looks like the suzuki 4 stroke/johnson 4 stroke 70 hp would be the best fit for the 17 montauk.
I would shy away from honda 70/90 because of the weight.

In california, not all lakes let you use a 2 stroke motor.

*I will have the same problem some day either repower or should I just buy me another boat (new 170 montauk)?

Ken (17 montauk)

lhg posted 02-06-2003 01:40 PM ET (US)     Profile for lhg    
Until the Yamaha/Mercury 90 4-stroke gets the EFI system, I would not get one, either color. If you want a Mercury 4-stroke, get the far superior 115 EFI, at same weight. The boat WILL handle it.

The 90 2-stroke is a great engine, one of Mercury's highest sellers. The idle problems mentioned by JB, above, sound like the result of improper carb adjustment service.

The integral oil injection tank alone makes it preferable over a Johnson. 16' Whalers don't have a lot of space for a separate oil tank installation.

triblet posted 02-06-2003 08:16 PM ET (US)     Profile for triblet  Send Email to triblet     
seasicknes, in all of California, there are
about four lakes that don't allow two-strokes.
Three of them I've never heard of. The fourth
is Tahoe, which doesn't allow carbureted and
TBI two-strokes. They do allow direct
injection two-strokes. (Acutally, they allow
and disallow based emisions, but the net
effect is as described above).

I've got a 90HP Evinrude two-stroke. If I
were to have to repower today, I'd go with
a 70HP four-stroke. Same weight.


jimh posted 07-20-2003 08:45 AM ET (US)     Profile for jimh  Send Email to jimh     
[Removed dead links to auctions and other websites.]
JohnJ80 posted 07-20-2003 10:22 AM ET (US)     Profile for JohnJ80  Send Email to JohnJ80     
I would take a very serious look at the Evinrude FICHT DFI motors. They are fast out of the hole, very quiet. Mine is about 30-40% more fuel efficient than the comparable carbed 2 stroke I had before. I also uses about the same amount less oil (and the 2 stroke was great on both).

since bombardier bought OMC's assets and fixed the problems the reliability issues are gone.

i haven't seen the new e-tec motors from Evinrude, but they are coming out now. I would give these a serious look they are supposed to be lighter (good weight to power ration).

Failing that, i would do a yamaha.


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