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Author Topic:   Opinions or Montauk re-power
Barnett Childress posted 05-19-2002 12:25 PM ET (US)   Profile for Barnett Childress   Send Email to Barnett Childress  
Hi all,
Asked a few members off list about this already but thought I'd throw it out to the list for suggestions. After carefully concidering my needs & uses I'm looking at the possibility of re-powering my Montauk. Boat came rigged with a Merc 90HP 4 stroke. It's a nice engine and runs well, but I've come to feel that this is a bit to much motor/weight. Also my needs for the boat are changing somewhat. Currently I fish mostly larger fresh water lakes here in central Mass and occaisionally have to pull the nephews around on tubes or maybe at some point skis. That was fine for my current setup. However I want to start fishing a lot of the smaller ponds that have great fishing but are shallow, with rocks and stumps where I don't want to use my main engine & Quabin resavoir where there is a 20HP limit. I also want to get out into the ocean at some point and would just feel better having an aux engine. I'm looking to replace current Merc 90hp 4S at 386# with a lighter main engine and add a kicker.

Stopped by the local Yamaha dealer on the way home and discussed what I was trying to do. They came up with what looks to be a good overall combo. A Yamaha 90hp oil injected 2 stroke and a Yamaha T8 "hi- thrust" 8hp 4 stroke for the kicker. The 90 2S weighs 261lbs, the kicker 99lbs giving a total weight of 360lbs. Approx. 26 lbs lighter than what I have now. They suggested the T8 hi-thrust 4 stroke for several reasons;
1- The hi-thrust series has a much lower gear ratio than conventional 2S kicker's with a much larger prop. They are meant to push larger loads. Dealer says should give me same performance as a 9.9-15hp 2S with more control.
2- I can run both engines from my Pate 24 gal. tank. No need for extra tank for pre-mix.
3- 20" shaft so T8 will mount directly to transom.
4- T8 will troll all day no problems. Quiet, clean & should get me around well enough when needed as primary motor on waters mentioned above.
5 - Motors can be configured with a dual binnacle throttle control at helm & remote start. T8 also has power tilt.

The only other thing to work out would be steering. I want the ability to steer the kicker from the helm when I want to keep main motor completely out of the water.

Lastly my Montauk lists to port at rest and underway due to 60lb electric bow mount trolling motor. Additional weight of 99 lb kicker mounted to starboard transom should help get her back to level at rest and possibly help offset any prop torque?

Other options in same weight class might be Merc 60hp 4S bigfoot but don't know if it would work as well for tubing/skiing? And I like having the motors & controls match. Appreciate any advice and sorry for the LONG post, but were talking a few $$ so I want to run this by you more experienced owners out there to help me get it right!

half shell posted 05-19-2002 02:20 PM ET (US)     Profile for half shell  Send Email to half shell     
I have a 50HP Honda 4 stroke at 212lbs.Ilove the reliability and fuel economy. Ican go out for 5 or 6 hrs on 6 gallons of fuel.My dad has a 70 HP Yamaha 2 stroke and I will admit it has great hole shot and torque compared to the Honda. However out here on buzzards bay the extra top speed of the Yamaha only gets used early am when the water is flat. Maybe the 60 bigfoot or 60 Yamaha 4 stroke is the choice,waterski duty aside.
John from Madison CT posted 05-19-2002 04:36 PM ET (US)     Profile for John from Madison CT  Send Email to John from Madison CT     
IMHO, you don't need that heavy high thrust kicker for a Montauk, which is a light boat.

I have a 5hp 4 stroke Tohatsu, which weights about 60 lbs. It pushes the boat easily to 5 knots. Over that speed and you start running into diminishing returns real fast and displacement speed issues.

The Tohatsu only burns 1/2gal /hour at WOT, which you don't use.

BTW, my regular motor is a Yamaha 90, which may not be the fasted Montauk option, but all in all, it's size, weight and Yamaha reliability make it the #1 choice in my book.

Good Luck,


Barnett Childress posted 05-19-2002 05:13 PM ET (US)     Profile for Barnett Childress  Send Email to Barnett Childress     
Do you think the hi-thrust T8 is overkill concidering the fact that I proably will have to run it WOT when used as my primary engine? Yamaha also makes a 8hp 2 stroke at 60lbs. This was my first choice until dealer pointed out all the advantages of T8 I mentioned. Nice to hear your happy with Yam 90 as primary engine.
compounder posted 05-19-2002 05:22 PM ET (US)     Profile for compounder  Send Email to compounder     
Whatever kicker you decide on, I would still carry along a portable fuel tank as an alternative fuel supply.

What few problems I have had on the water were always fuel-related. Good to have an independent supply on hand which can run either motor.

My rig is Montauk/Yamaha90/Nissan9.8.

half shell posted 05-19-2002 08:36 PM ET (US)     Profile for half shell  Send Email to half shell     
Barnet will they even let a boat with over 20 hp on Quabbin regardless of having a smaller kicker too ?
Barnett Childress posted 05-19-2002 08:53 PM ET (US)     Profile for Barnett Childress  Send Email to Barnett Childress     
You have to pull the prop off of the large motor. Restrictions are up to 20hp for 2 stroke or 25hp for 4 stroke.
Bigshot posted 05-20-2002 03:05 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
I would do a 5 or 6hp. Anything bigger is probably a waste. On a 18-22 the 8-10hp would be fine.
Don Fisher posted 05-20-2002 05:14 PM ET (US)     Profile for Don Fisher  Send Email to Don Fisher     
I have a Toahatsu 4hp 4 stroke as the kicker on my Montauk. It has the same powerhead as the 5 & 6 hp 4 strokes except in has an integral fuel tank - something I really wanted to free some deck space. It is more than adequate for the Montauk and gets great fuel economy. I carry a 1 gallon gas container to refill. It is easily placed out of the way. The 4hp also has the fitting for an exteral hook-up if you so desire.

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