Moderated Discussion Areas
  ContinuousWave: Whaler Performance
  Montauk 170 owners: what engine mount hole?

Post New Topic  Post Reply
search | FAQ | profile | register | author help

Author Topic:   Montauk 170 owners: what engine mount hole?
Marsh posted 09-21-2004 02:13 PM ET (US)   Profile for Marsh   Send Email to Marsh  
I repowered my 2004 Montauk 170 with a 4stroke 115 Merc. The dealer mounted it in the 2nd bolt hole (from top), and it ran fine. Small tendency to porpoise unless trimmed down, but not bad at all.

I have an almost uncontrollable tendency to tinker, so I moved it up one the 3rd bolt hole. Still runs fine. Less tendency to porpoise, but then it wasn't all that bad before. Now has small tendency to cavitate if trimmed up too high, but not bad at all.

Curiousity forces me to ask what bolt holes other Montauk owners use, especially any who, like me, run a 115.


divefan posted 09-22-2004 01:46 AM ET (US)     Profile for divefan  Send Email to divefan     

This is something I have considered for some time. I spoke to the dealer here in FT. Lauderdale and he told me he would NOT mount the 115 on my boat. Also, he quoted me some crazy numbers on the swap out. If you don't mind me asking how much did you pay and what did you trade in? Also, did the dealer do it for you? Any info you could give would be appreciated. I also have a 2004 170 with a 90 HP 4 stroke.


LHG posted 09-22-2004 05:23 PM ET (US)     Profile for LHG    
Available engine mounting height is dependent on propeller used. To be in Mercury's middle (third out of 5) holes, you should definitely be running either a Laser II or High Five prop, probably 20" pitch with a 115. The 170 ought to "scream and fly" with this setup.

Gary, trading in an engine at a Whaler dealership would be a disaster, if I may be so blunt. You'll take a bath, if they'll even do it.

A good Merc 90 4-stroke should command a good price on the used market, somewhere between 2/3 and 3/4ths of what one would cost new, bought most competitively. Remember, your buyer ducks sales tax too. Advertise it (even here) and sell it outright on your own. Yours is definitely mint.

Then go down the canal from Lauderdale Marina to Sundance Marine (they are my Merc dealer, great pricing and great service) and buy the Merc of your choice. I would look at all three of their 115's, the 4-stroke, Optimax and even conventional 2-stroke (which will run the fastest). All are a simple bolt on, no other changes needed, no external oil tanks. If you want a "clean screamer", get the 135 Optimax! Now you're talking

LHG posted 09-22-2004 05:33 PM ET (US)     Profile for LHG    
PS: I forgot to mention that Mercury's 75/90/115 4-stroke cowling is the same one used on the 150 & 200 conventional two strokes, carb and EFI. So a V-6 on a 170 will look no larger than a 90 4-stroke, and weigh about 20# more. The Optimax V-6 hoods are also the same, but have a higher crown on them.
Marsh posted 09-23-2004 08:39 AM ET (US)     Profile for Marsh  Send Email to Marsh     
I opened the yellow pages, and the first two dealers I called refused to do the swap. Third dealer said sure, no problem. Both motors weigh the same, he said. Charged me the MSRP difference between the two engines (the 115 being an '05 MSRP, and the 90 being an '04 MSRP), plus $200 for de-rigging the old, and mounting the new. I could probably have done it myself, but he offered same-day service, and he had the tools and expertise.

The new motor really shines when I am loaded down with fuel, ice, food/beverages, fishermen, etc. Cruises much more effortlessly at 3500-4000 rpm than the 90 model did.

When boating alone, the 115 is also MUCH more of a rush at WOT, too.

Plus, the 115 is fuel injected vs. the 90 having carbs.

It was expensive, but I plan to have this vessel a looong time. Sort like the Pate fuel can get by just fine with the stock plastic 6 gallon tanks, but for me, the $400 spent on the Pate tank was worth it in the long run.


AQUANUT posted 09-23-2004 10:14 AM ET (US)     Profile for AQUANUT  Send Email to AQUANUT     
hey marsh I am running in the second hole up from the bottom

TexasWhaler posted 09-23-2004 10:45 AM ET (US)     Profile for TexasWhaler  Send Email to TexasWhaler     

What's the story on the Montauk with the EFI 225?
Is that yours?

divefan posted 09-23-2004 03:09 PM ET (US)     Profile for divefan  Send Email to divefan     

Thanks for your help. I wish it were that easy down here.


Larry, maybe when you come down we can tackle the project together. Something to do if we're not boating on a too windy day. :-) 135 Opti sounds GREAAAAAT!

BTW, will you be down for the boat show end of October?

bigjohn1 posted 09-26-2004 07:04 AM ET (US)     Profile for bigjohn1  Send Email to bigjohn1     
I read this thread with interest as my 115EFI powered 170 is about to be delivered. It has been nearly 5 long months since I placed my order but then again, I guess that's what I get for living way out here thousands of miles from the West Coast (Guam). Interestingly, my authorized Whaler dealer had no problem at all with selling me a 115 as long as I was willing to sign the voided hull warranty. I think the dealer here may not be under the same restrictions as mainland U.S. dealers but who knows. Guam is a U.S. Territory by the way. As for cost, my dealer charged me $1,000 over and above the cost of the 4-stroke 90 option for this EFI 115 -- and its a Mariner. He already has my engine sitting on a stand at the dealership with a "sold" sign on it so I have been able to check it out up close and personal before it even goes on the boat. It took a few times looking at it to warm up to the looks of the gray cowel but I'm used to it now and think it will look just as good as the black-cowel'd Merc sitting back there on the transom.

I'm really glad I made this decision as I went back and forth before making up my mind. The 2-stroke 90 was never an option in my mind but I did think long and hard about the merits and pitfalls of the carbed 90 4-stroke, a 90 Optimax, and the 115 EFI. I even thought about waiting a year till '05 when Merc will make the 90 in an EFI model (I think?). I know when I get in a tight spot with confused seas, high winds, or an outgoing tide, I will appreciate the little extra power the 115 has. Plus we might be doing some water skiing from time to time and I know the 115 will really shine there.
Big John

Post New Topic  Post Reply
Hop to:

Contact Us | RETURN to ContinuousWave Top Page

Powered by: Ultimate Bulletin Board, Freeware Version 2000
Purchase our Licensed Version- which adds many more features!
© Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000.