Thread subject: Whaler Central - Boston Whaler Boat Information and Photos :: Montauk 17 repower
Posted by RichAndrews on 08/26/12 - 10:31 AM
#1
I have a 1988 Montauk which came with Merc motors. I replaced the Merc 9.9 kicker a couple years ago with a Honda 9.9...great motor. Now I am thinking of replacing the original 100hp Merc with a 90hp Honda. I have dual starting batteries located in the stern. Per published specs the Merc 100 weighs 340 lbs. and the Honda 90 weighs 359...which is only 19 lbs more. I have read some forum comments about the Honda being too heavy for that boat. I could relocate the batteries to the center console but would rather keep them where they are. Does anyone out there have this 2 Honda setup on an older Montauk? Any and all advice appreciated.
Posted by RichAndrews on 08/27/12 - 8:56 AM
#3
Thanks Joe, what do you think about going with the Honda 60hp (239lbs)? I use the boat primarily for fishing, some cruising and may one day want to pull a grandkid on a wakeboard. Frankly, with the 100hp Merc it is almost too fast.
Posted by saumon on 09/02/12 - 9:56 PM
#4
I know you were looking for a Honda, but the newer (2010 and up) Yamaha F70 at 257lbs is hard to beat for the power to weight ratio (for a 4-stroke, of course). As an example, the Suzuki DF70 weight 341lbs, but the comparision may be unfair cause the DF70 is a detuned DF90 when, on the other side, a F70 share the same block than the F50/60...
Edited by saumon on 09/02/12 - 10:17 PM
Posted by Phil T on 09/03/12 - 6:14 AM
#5
Look at the Engine Choices article for the options for your hull. On the left sidebar.
I would not lower power to save weight. A Montauk with a properly rigged 70 hp has a WOT speed of 37-39 mph. A 90hp is good for 41-43 mph.
If you have 2 adults and 2 kids, full gear, gas, etc most of the time, a 90hp is recommended.
Given the economy of a 4 stroke, you may want to remove the kicker or find a smaller hp that weighs less.
Posted by DennisVollrath on 09/03/12 - 12:08 PM
#6
I am very pleased with my 70hp and Montauk combination. Yesterday we were out with 3 adults and our lab, plus gear. With the Stiletto 13.25" x 13" we got on plane very quickly, and could go as fast as the water permitted, at times 33mph. This was not WOT.
Don't mean to sound too evangelistic, but there is plenty of power and safety with a 70hp motor on a Montauk.
Dennis
Posted by Maxman98 on 09/06/12 - 3:57 AM
#7
Gents, I will be repowering an 1988 montauk also. My first choice would probably be the e-tec, but due to financial consideration and some dealer loyalty (great price from a Merc dealer I know), I'm inclined to try a 60hp Bigfoot.
I'm less concerned with top end speed than low end performance. I'd be satisfied with 30mph WOT with low 20s cruise which I believe the 60hp will deliver this based on a number of engine tests reports on various hulls.
I have less confidence that it will provide adequate hole shot when pulling medium sized skiers and wakeboardwrs up and out (130 to 150 pounders). Whaler outfits the new 150 montauk with the 60hp BF swinging a 13.25x14 stainless prop. Performance tests look very good with this combo but I've not seen any first hand accounts of results with water sports.
If the 90hp 4s were not so heavy and awkward looking for the hull, I'd surely opt for more hp, but 400 lbs plus battery and occasional kicker is too much IMO.
Any comments would be appreciated. I plan to go with the Merc 60 BF unless I'm told it is completely inadequate for the task.
Thx, Jon
Edited by Joe Kriz on 09/06/12 - 10:43 AM
Posted by Phil T on 09/06/12 - 9:26 AM
#8
I doubt you will be able to pull a skier out of the water with a 60hp.
Posted by Maxman98 on 09/06/12 - 11:19 AM
#9
thx, Phil. I was afraid someone would say that. bummer.
Posted by mtnsherpa on 09/06/12 - 11:49 AM
#10
My 150 lbs have been pulled up and out and skied behind a 50hp, 4-stroke powered Montauk 17 with 2 adults onboard. Just last year...first time skiing in about 25 years!
1997 Montauk 17, stock with comfort package and bimini.
1998 50hp, 4-stroke Mercury (non-Bigfoot), non-optimized setup (1-hole up, original aluminum prop).
Posted by Finnegan on 09/06/12 - 3:19 PM
#11
Since Rich already has a Honda kicker on the boat, I think he should stay with Honda for the main motor. I don't like the look of two different brand engines on any boat.
If you are happy with the weight of the Mercury 100, I can't see how a few more pounds could make a difference.