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Author Topic:   Yamaha 90 on Montauk?
compounder posted 09-24-2000 09:28 PM ET (US)   Profile for compounder   Send Email to compounder  
After months of reading,talking,questioning,and reading some more, I've decided (just about) to go with the 90 h.p. Yamaha c-90 2-stroke to re-power my Montauk. I had it down to 2 engines, the new 60 horse 4-stroke Mercury or the Yamaha 90 2 stroke. The price was practically the same (approx. 5800), but I'm stepping down from a 115 Evinrude, and thought I might feel underpowered with the 60. Larger 4-strokes are just too heavy, so I guess I'll go with old technology. All I need now is for some of you knowledgeable guys to either talk me the rest of way into it or talk me out of it. I've really only heard good things about the Yamaha---they seem to be the most common Montauk powerplant around these parts. What do you guys think? (Last time I'll ask---I promise!)
Ed Stone posted 09-25-2000 09:05 PM ET (US)     Profile for Ed Stone  Send Email to Ed Stone     
Hey compounder,
The Yam.90hp is a perfect power for the 17.
And it seems the price is right.But some
people say if you own a 4-stroke you'll
never be fully happy with a 2-stroke.
With the 4-stroke there is no smoke,
smooth idle ,less noise,no need to purchase
2-stroke oil,and in your case less fuel.
good luck!
Clark Roberts posted 09-26-2000 06:01 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Compounder, Ed is right, the 90 Yamaha should serve you well on the Montauk... Simple engine and light weight for a 90... it's a small 90 , in displacement at about 71 cubic inches compared to 84 cubic inches and 99 (or 105) for the Merc and Omc....respectively.. should run out in the high 30's (maybe low 40's depending on the set-up and prop) Happy Whalin'... Clark.. Old and Opinionated
maverick posted 09-26-2000 06:59 PM ET (US)     Profile for maverick  Send Email to maverick     
My nephew just boughtr a new Yamm 90 for his Montauk -
He loves it - write him at:
JimU posted 09-26-2000 07:28 PM ET (US)     Profile for JimU  Send Email to JimU     
I jus put a new Yamaha 90 on a 1971 16-7 Whaler that I restored. Works great with a 13 3/4 by 15 Stilleto prop. JIM
compounder posted 09-26-2000 08:49 PM ET (US)     Profile for compounder  Send Email to compounder     
Thanks JimU----what did you pay if you don't mind saying?
Soho posted 09-26-2000 10:22 PM ET (US)     Profile for Soho  Send Email to Soho     
For what it is worth, I just went through the same exercise - I had a Yamaha 90 that died on my '68 "montauk" type [ not sure of original model, I just call it a Montauk ] I am in the middle of refurbishing the boat and looked at a Yamaha 4 Stroke 100, decided the extra $2000 and 95# just didnt make sense and bought another Yamaha 90. The old one was great. All that I have read on this site confirms that the decision was valid. Many people seem to run lower HP engines even, but I felt that 90 was about right for my usage. Interestingly enough your price was about what mine was, and I live in Bermuda where things are usually much mode expensive due to 22% import duty.

Good luck

JimU posted 09-27-2000 11:52 AM ET (US)     Profile for JimU  Send Email to JimU     
Compounder: engine including binnacle mount Yamaha controls, steering, and installation was about $6000 including sales tax. (Engine with standard controls was $5200.) binnacle mount was more expensive. Prop was $345 plus tax.
Dick E posted 09-27-2000 07:13 PM ET (US)     Profile for Dick E  Send Email to Dick E     
Jim U what's was your top speed and how many rpms were you turning?
JimU posted 09-28-2000 05:29 PM ET (US)     Profile for JimU  Send Email to JimU     
I just rigged the boat up. I have not had a chance to put it through its paces at WOT. The engine is not quite broken in, but prelem feel is good. I'll report back ASAP
compounder posted 10-26-2000 10:20 AM ET (US)     Profile for compounder  Send Email to compounder     
I stopped by the dealer first thing this morning to discuss the purchase of a c90 and find out he has just purchased several 1999 c90s from another dealer. Engine,controls,digital gauge,stainless steel prop,installation & tax comes to $5650. Is this a good price on what is now essentially a 2 year old engine? I'm tempted to take the old girl down tomorrow for her transplant! Also, having never owned an oil-injected outboard, I like the idea of mixing my own. How do most of you feel about this? Comments please. Thanks.
bigz posted 10-26-2000 10:52 AM ET (US)     Profile for bigz    
Price is pretty darn good with the full rigging package -- and with warranty I would imagine (can you purchase the extended one)! If I recall your real comfortable with your dealer, what does he recoomend?

Having had many mix your own and now a pair of mix themselves Yams would be hard pressed to revert back --- nice and easy to pull up to the gas dock say fill her up and then if necessary add oil to the aux. 3 gallon reservoirs and forget it --- no calculations no messing with gallon bottles etc etc ---

Bottom line I'd say --- go for it ---


seadab posted 10-26-2000 08:42 PM ET (US)     Profile for seadab  Send Email to seadab     
Compounder... I have a 1981 90hp Evinrude on my 17' Montauk and at WOT it will run 39.8 w/13 gals. of gas. Plenty of engine for that boat I would imagine, however I have not had the ability to run a bigger engine. My mech. thinks when this one goes I should put an Ocenarunner 110 on it. However that might not be a bad idea considering the amount of cheeseburgers I eat in a given week! <G>
lhg posted 10-26-2000 09:35 PM ET (US)     Profile for lhg    
A 90HP engine, any brand, in good shape and properly set up on a Montauk should do about 45-47mph. I ran a 1973 Merc in-line 6, 150 powerhead rated HP, on my 16' Nauset for ten years, and it would do about 56mph. This is really pushing the safe speed limit on that hull and you had to watch what you were doing!
After putting about 5000 hours on that engine, I dropped down to a 1985 prop rated 115 Merc in-line six, and it would do about 51.
The Lake George (NY) Park Commission police ran a whole fleet of Nausets with Evinrude V-4 115's in those days. But they couldn't keep up with my 150 Merc!
triblet posted 10-27-2000 01:16 AM ET (US)     Profile for triblet  Send Email to triblet     
Seadab: 39.8 whats? Knots? MPH?
Furlongs per fortnight?
parsecs per millenium?
compounder posted 10-30-2000 04:37 PM ET (US)     Profile for compounder  Send Email to compounder     
Well guys I'm sure you will be glad to hear that after all the wringing of hands and gnashing of teeth I've made up my mind----once and for all! The winner is..........1999 Yamaha C90. Gonna take the old gal down Wednesday a.m. for the transplant. $5650 out the door with SS prop and everything. Don't know if I can sleep the next couple of nights or not. Thanks to everyone for all the input. I don't know exactly why this has been such a hard decision, but propably has to do with all the memories and family fun we have had over the last 19 years with the Montauk and 115 Evinrude. My two sons learned to ski behind her and progressed to near Cypress Garden level. Both boys landed their first fish over her gunnels. We've travelled up and down the nearby coastal waters to various points of interest, campsites, restaurants, etc. A new motor is major thing, right?
compounder posted 11-08-2000 08:56 PM ET (US)     Profile for compounder  Send Email to compounder     
Went by to check on the Montauk today (Wed) and the Yamaha sure looks sharp sitting there on the transom. The dealer and I apparently mis-communicated about a digital information center which I thought was included. Good news is another 200 came off the price. Bad news is I use my old tach. Supposed to go Friday and pick her up---I'll start the agonizing 10-hour break-in his weekend!
The dealer and his tech recommend that we start with a 13X17 SS prop. Comments on prop size with this combination of boat & motor would be appreciated.
Tsuriki BW posted 11-08-2000 11:25 PM ET (US)     Profile for Tsuriki BW  Send Email to Tsuriki BW     

Congrats on the new power plant. May it give you many many more years of boating with your obviously "beloved" Montauk.


Clark Roberts posted 11-09-2000 07:57 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Compounder, I have a Montauk with 90 Yamaha and it has the digital tach (et al) and I would be happier with the analog version...... but it's ok... the 17 pitch should be about right... mine peeks at 5300 and a neighbors Montauk with a 90 Yam is spinning a 15" pitch and his hits 5300 also. My prop is a Yam SS and his is a Stelleto SS. Go figure... Happy Whalin' .. Clark

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