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Author Topic:   170 Montauk Equipment
ChocLabWhaler posted 05-03-2005 01:18 PM ET (US)   Profile for ChocLabWhaler   Send Email to ChocLabWhaler  
Has anyone put hydrofoils on the Merc 90 4-stroke, yet? Does it help get up on plane? Has anyone had the idle/troll speed adjusted? Those with electric trolling motors, what transom mounted/thrust should I get for lake trolling? What console and RPS covers should I get? Thanks, CLW
erik selis posted 05-03-2005 03:14 PM ET (US)     Profile for erik selis  Send Email to erik selis     
To answer one of your questions: A 55lb thrust mounted on the transom works fine. I have a MinnKota 55lb thrust Back Troller on my 170 Montauk. I use a 12V-105Ah battery that keeps me going all day.


bspencer posted 05-03-2005 03:27 PM ET (US)     Profile for bspencer  Send Email to bspencer     
I'm assuming you want to adjust your iddle forward speed? Why? I had to adjust mine as it was set to low by the service shop and died every time I shifted from forward to nuetral. And out of spite I was not going to pay them to get it right.
To do it right get yourself a service manual, one for our engine is available by clymer on Amazon. But, you will need to get a accurate shop tach and a carb tuner which allows you to synchronize all four carbs together. Its much easier than it sounds.
I plan to add a doel-fin hydrofoil to my 90 4S, I chose it by price but do some searches on this site to help you make your decision.
montaukman posted 05-03-2005 08:54 PM ET (US)     Profile for montaukman  Send Email to montaukman     

I too am looking into a stabilzer. There is alot of discussion about them in the archives. Do a search....I can't believe I am saying that because i am constantly guilty of not doing a search on a topic before i post the

That being said, the Doelfins are the least expensive and least obtrusive. My questions about a hydrofoil came back answered predominantly with two replies.

1. Learn the boat and wait till you are absolutely sure you want to try a stabilzer.

2. Most seem to use the Doelfin and most are very happy with the results.

I am either geting the Doel Fin or the Tigershark VG. I like the Tigershark VG. It looks nicer and i think is either comprable to the Doel fin or possibly even better in perfpormance. The web site (can't remember what it is) is prety informative and may be biased but the Tiger Shark is about the same price as the Doelfins and the Vortex Generators (hence the "VG") supposedly help more so than the smooth sides of the Doelfin

As a word of caution, I went on the Mercury website and went to the FAQ area and saw whether Mercury condones the use of these. The were basically ambiguous saying that any problems arising from the use of these fins is not covered yet they did not deny or praise the benefits of the fin. Basically, they were covering themselves.

I plan on doing it regardless as i can't imagine, other than drilling holes in the cavitation plate, what problems can arise from this installation.

this is a very popular topic so any results you get from putting these fins on would be greatly appreciated by myself as well as many on the list.

Good luck,


fishinchips posted 05-03-2005 10:48 PM ET (US)     Profile for fishinchips  Send Email to fishinchips     
I put on a cobra fin on mine.
works good.

billyc posted 05-04-2005 09:28 PM ET (US)     Profile for billyc  Send Email to billyc     
I had a trim motor go out on a under-warrenty Merc with a fin installed. The dealer fixed the motor with no charge.
fishroy posted 05-10-2005 09:45 PM ET (US)     Profile for fishroy  Send Email to fishroy     
I installed an aluminum fin on mine 90hp,looks like a (manatee tail)the price was $30.00 from Bob's Machine shop in Ruskin Florida, go to the internet and type in Bob's Machine Shop and get the number. This is my second Whaler and the aluminum fin on both boats greatly reduced the Purpoising effect.


mikeyairtime posted 05-10-2005 11:54 PM ET (US)     Profile for mikeyairtime    
I've got a Permatrim for my 170 only because my Doel-Fin on my old boat got beat up pretty quickly. (It never failed or lost performance, it just looked beat after a few years) The primary benefits are for rough water operation. The tab allows you to plant the bow of the boat which allows the forward sharp part of the hull to cut through the slop. Also you can stay on plane at a slower speed so you don't beat yourself up as bad. This is for pounding straigh uphill into a swell or chop. When running downhill with the swell in the slop you have to be careful to trim the motor up some so you don't broach the boat because the bow down attitude is so pronounced. It is a very effective "tool" for running big water in a small boat or in some cases for helping an underpowered boat up over the step and onto plane. That said if I had trim tabs or only ran on calm water I'd save my money because they actually creat some drag.

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