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Author Topic:   Montauk Mania!!
compounder posted 05-14-2001 09:58 PM ET (US)   Profile for compounder   Send Email to compounder  
I got the old girl out on the river today....been fiddling with the electricals and varnishing teak (the Epifanes looks good).

I still haven't installed the Mills canvas....I'm waiting to get the new boat shed finished so I can store it inside.

I gps'd the Yamaha 90 today and I'm just a little disappointed-------at 5400 rpm WOT we were at 39.7 mph. The 20 year old Evinrude 115 gave me 47 mph, but sucked down the dino juice like you wouldn't believe. I'll be monitoring the fuel consumption on the Yamaha and report back.

Also tried out the Nissan 9.8 newly mounted directly to the starboard transom as BW suggests. Half-throttle was a sedate 3.5mph and WOT resulted in 6.0 mph. This was with the 90 down in the water and used as a rudder,even though it created considerable drag. I ran the 9.8 for one hour and could not tell that it had used any fuel out of the 3 gal. tank.


lhg posted 05-14-2001 10:50 PM ET (US)     Profile for lhg    
Joe - Everybody who has one thinks the Yamaha 90 is a great engine, but Clark Roberts, our engine specialist, has indicated that he's never been able to get one over 42mph on a Montauk, and thinks they're really putting out less than 90 HP. They're lighter than the rest, and probably more fuel efficient, but also much smaller on cubes than the OMC or Mercs. And you've got some extra weight with the kicker.

There is prior discussion on this subject from not too long ago.

Whalerdan posted 05-15-2001 07:34 AM ET (US)     Profile for Whalerdan  Send Email to Whalerdan     
Hearing this bums me out. I have a 85 Evinrude 115 and currently in the same position as compounder was. I've been trying to figure out what to reengine with and I thought the C90 would be great. 39.7mph is ok but I thought you easily get over 40.
compounder posted 05-15-2001 08:31 AM ET (US)     Profile for compounder  Send Email to compounder     
WhalerDan, don't be too bummed out! I said I was a LITTLE disappointed. Actually I'm pretty happy with the 90. Accelleration is brisk and the top speed is faster than I almost ever want to run.

Also, I'm hauling a pretty heavy load. Sixty pound kicker, two batteries,large custom bimini, 25 gal fuel,spare 6gal and spare 3 gal fuel tanks (full), and every spare & tool I could imagine ever needing.

So, all in all, I probably should not complain.


lhg posted 05-15-2001 01:42 PM ET (US)     Profile for lhg    
For a Montauk, if MAX speed is of importance to you, and you want to stay LEGAL, in two strokes you want a Merc 90, as the factory installs. Properly set up, st back and lifted up, you could get close to 50 out it.

In 4 strokes, you would want the Yamaha 100 or Merc 90.

JimU posted 05-15-2001 03:02 PM ET (US)     Profile for JimU  Send Email to JimU     
My 16-7 (1970 vintage) 18 gals fuel, two batts, and me @ 215 lbs gets 43 with careful trimming with a new Yam c90. I just put it in for its 20 hour check/maintenance. With clean carbs and new plugs I might get another 1-2 mph. I cruise around 28-30. Any faster than about 40 produces chine walk
daverdla posted 05-15-2001 03:39 PM ET (US)     Profile for daverdla  Send Email to daverdla     
Could you explain "chine walk"?
compounder posted 05-15-2001 07:27 PM ET (US)     Profile for compounder  Send Email to compounder     
I was talking to a neighbor today about his Scout 172/Yamaha 115 and he says he dropped at least 4-5 mph when he painted the bottom with anti-fouling paint. I think this may be a significant factor on my Montauk....I have 3 coats and the surface is similar to 220 grit sandpaper.
lhg posted 05-15-2001 07:51 PM ET (US)     Profile for lhg    
A couple point of interest. The 16' hull is faster than the 17 Montauk, and lighter, so this would bear out JimU's findings vs Clark's with the Yamaha 90.

Bottom paint WILL eat speed, no question about it. Ever see an Offshore Racer or Bass Boat with bottom paint? Tee tops are another item that hurts speed.

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