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Author Topic:   Yamaha F-100 (4-stroke) on Montauk
compromise posted 05-24-2002 05:43 PM ET (US)   Profile for compromise   Send Email to compromise  
I have a 1997 Montauk with a 1997 Yamaha 90. I am considering pulling the two stroke off and installing a new 100 hp Yamaha four stroke engine. I know that the new engine will be heavier, and will be a little better on fuel. Presently I get 3.56 + or - from my rig. Is it worth my while to make this change? I fish totally offshore, and the increased range will be a real plus, but if the extra weight is a major negative factor, mabe I need to reconsider. Am I missing anything on the negative side of this change besides the weight? Am I making a dumb choice? Any input would be greatly appreciated.


half shell posted 05-24-2002 06:03 PM ET (US)     Profile for half shell  Send Email to half shell     
Compromise yamaha 90 2 stroke 261 lbs y f100 4 stroke 356 lbs y f60 244lbs most people would say 300 lbs max on Montauk transom. However your cruise speed would most likely be less than your current rig.Most likely 30 mph or less based on my 50 hp Honda cruise 27 mph max 31 mph. How far out you go and of course sea conditions would dictate your speed anyway.I love the Honda and very few times in Buzzards Bay I could use more speed due to the prevailing winds.Running the boat all day 6 to 10 gallons of fuel depending on conditions speed and time not running.My opinion repower if your engine is tired 2 stroke if you want high speed 4 stroke if you want zero fumes and great fuel economy.
Don Fisher posted 05-24-2002 10:54 PM ET (US)     Profile for Don Fisher  Send Email to Don Fisher     
My Dad has the F100 on his 2001 Montauk. It is a sweeeeet motor. No problem with the added weight on the transom.
Tom W Clark posted 05-24-2002 11:27 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
Boston Whaler specifies the maximum engine weight on the transom of a Montauk at 410 lbs. Sounds like the Yamaha F100 will be fine and still leave room for a kicker.
jimh posted 05-25-2002 12:35 AM ET (US)     Profile for jimh  Send Email to jimh     
{Administrative post--jimh.]
compounder posted 05-27-2002 06:00 PM ET (US)     Profile for compounder  Send Email to compounder     
You gave no reason for replacing your engine except for possible fuel savings. If your 97 is giving you good service, I'd say keep on truckin'. I don't think the gain in mileage would be that much. Certainly not enough to justify the huge difference you would have to pay.
Buffalo posted 05-27-2002 08:48 PM ET (US)     Profile for Buffalo  Send Email to Buffalo     
I just started my second Salmon season today with my Yammaha 100/4strk. My hull is a 83 montalk. I run 10 to 14 miles at about 20 MPH, troll 5-6 hours , run back home. Fuel on new engine is 5 gal +or-. My old engine was a 91 OMC 100 which was 10/12 gal for the same deal. I don`t know top speed because of ocean conditions, but in Tomalis Bay on the way in I saw 41 on the GPS... it is a good engine
dogfish2 posted 05-28-2002 12:11 AM ET (US)     Profile for dogfish2  Send Email to dogfish2     
I have a 2000 Montauk and a 90hp 4 stroke Merc., which is very comparable to the 100hp 4 stroke Yamaha. Figure on 5-6 miles per gal., depending on speed. At WOT, you"ll run in the low 40's. No oil, no fumes, very quiet! Hope this helps.
dchapp posted 05-28-2002 09:16 AM ET (US)     Profile for dchapp  Send Email to dchapp     
I have a 1985 Montauk that has just been re done with new paint(awlgrip) New 100 4s(Yam)
Trim Tabs, Hyd steering. The motor may be a little heavy, but the boat performs great with the addition of the tabs, really helps the porpoising. Motor is mounted 1 hole too low (will fix soon) but I got between 44 and 45 mph with 24 gal fuel on board, as well as myself and 9 year old son. Total weight 290 for people.
dogfish2 posted 05-28-2002 09:52 AM ET (US)     Profile for dogfish2  Send Email to dogfish2     
I, too, have trim tabs which enhance performance at top end, and also assists in controlling attitude of boat. Weight does not seem to a problem.
Ogden Dunes posted 06-01-2002 08:04 AM ET (US)     Profile for Ogden Dunes  Send Email to Ogden Dunes     
I am repowering my 84 Super Sport with the Yamaha 4s. What prop did you put on your boats?
Boston Marine posted 06-01-2002 08:52 AM ET (US)     Profile for Boston Marine    
One thing very important to consider is the initial cost. Will you get enough of a return on fuel savings along with the sale of your 90 to make any sense of this. I agree four strokers are reliable but the initial cost is high and in many cases will require you to keep this rig for many years to see any dollar savings overall. With the four strokes selling at a all time high the future value will no doubt go down as a return on your investment. Just my .02. Greg

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