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Author Topic:   170 Montauk, Yamaha 90-HP Two-cycle

Ridge Runner posted 03-26-2010 09:01 PM ET (US)
My brother ran across a 2003 170 MONTAUK whose engine was stolen. He has access to a 2007 Yamaha 90TLR two-cycle engine. How will the Yamaha 90-HP do on this hull? I know this engine has a bullet-proof reputation, but it is also known as a weak 90-HP motor. Would it be useful for fishing with three adults off the beach and running around Barnegat Bay, New Jersey?
95Outrage17 posted 03-27-2010 10:58 AM ET (US)
Hi Ridge. I think a Yamaha 90-hp two-cycle would work fine on that hull and have ample power. It would likely not perform quite as well as one equipped with some other 90-HP motors, such as the 90-HP Mercury FOURSTROKE many were equipped with originally. As you said, the Yamaha 90-HP two-cycle is a great motor, but does seem to be slightly less powerful then some other 90-HP outboards. I like them a lot, and they're great on classic Montauk's. If he is saving some significant money by going with the Yamaha, then I'd say go for it. It probably won't be a powerhouse, but will work well. I'd expect a top speed around 40-MPH, lightly loaded. If he does go this route, some pictures and performance figures would be great.
- Chris
contender posted 03-27-2010 11:30 AM ET (US)
Yes, this would be a good combo
gmoulder posted 03-27-2010 03:58 PM ET (US)
Hello. I had a c.1998 Montauk 17 with a c.1998 Yamaha 90-HP for several years. It was a great combination. With two large adults it would run in the mid 40s. I remember occasions when we had four of us and were pulling people behind on an inflatable. There was never a lack of power, and I really liked the reliability of the Yamaha. Cannot imagine where a "weak" 90hp would come from.
jimh posted 03-27-2010 10:58 PM ET (US)
The original inquiry is about a completely different boat than a c.1998 MONTAUK 17. The 2003 170 MONTAUK is larger and heavier boat.
The comparison of the two 90-HP motors and rating one weak and the other strong is due to the displacement. The little Yamaha 90-HP displaces only about 1,140-cc. (It looks like Yamaha-USA has dropped this motor, as I can't find the specifications for it on their USA website anymore.) The Mercury monster motor displaces about 1,732-cc. There is an old bromide: "There's no replacement for displacement."
Of course the monster Mercury gives back some performance from the weight--it has to weigh about five or six times as much as the Yamaha. Okay, some hyperbole. The Mercury 90-HP weighs 181-kg or 399-lbs; the Yamaha 90-HP weighs 120-kg or 264-lbs. That is still a very substantial difference in engine weight, about 136-lbs.
SC Joe posted 03-28-2010 05:31 PM ET (US)
That engine being stolen is perhaps the best thing that could happen to that boat.
Where does someone have to park their boat for this unfortunate event to take place?
Clark Roberts posted 03-29-2010 06:42 AM ET (US)
The 90hp Mercury two stroke weighs approx. 304 lbs! NOT 399 lbs...beam me up... Clark...SCN
Clark Roberts posted 03-29-2010 06:44 AM ET (US)
I retract my above statement as I now see that it's the 90 Merc FOUR stroke being discussed. I should read more carefully, sorry! Clark

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Author	Topic: 170 Montauk, Yamaha 90-HP Two-cycle
Ridge Runner	posted 03-26-2010 09:01 PM ET (US) My brother ran across a 2003 170 MONTAUK whose engine was stolen. He has access to a 2007 Yamaha 90TLR two-cycle engine. How will the Yamaha 90-HP do on this hull? I know this engine has a bullet-proof reputation, but it is also known as a weak 90-HP motor. Would it be useful for fishing with three adults off the beach and running around Barnegat Bay, New Jersey?
95Outrage17	posted 03-27-2010 10:58 AM ET (US) Hi Ridge. I think a Yamaha 90-hp two-cycle would work fine on that hull and have ample power. It would likely not perform quite as well as one equipped with some other 90-HP motors, such as the 90-HP Mercury FOURSTROKE many were equipped with originally. As you said, the Yamaha 90-HP two-cycle is a great motor, but does seem to be slightly less powerful then some other 90-HP outboards. I like them a lot, and they're great on classic Montauk's. If he is saving some significant money by going with the Yamaha, then I'd say go for it. It probably won't be a powerhouse, but will work well. I'd expect a top speed around 40-MPH, lightly loaded. If he does go this route, some pictures and performance figures would be great. - Chris
contender	posted 03-27-2010 11:30 AM ET (US) Yes, this would be a good combo
gmoulder	posted 03-27-2010 03:58 PM ET (US) Hello. I had a c.1998 Montauk 17 with a c.1998 Yamaha 90-HP for several years. It was a great combination. With two large adults it would run in the mid 40s. I remember occasions when we had four of us and were pulling people behind on an inflatable. There was never a lack of power, and I really liked the reliability of the Yamaha. Cannot imagine where a "weak" 90hp would come from.
jimh	posted 03-27-2010 10:58 PM ET (US) The original inquiry is about a completely different boat than a c.1998 MONTAUK 17. The 2003 170 MONTAUK is larger and heavier boat. The comparison of the two 90-HP motors and rating one weak and the other strong is due to the displacement. The little Yamaha 90-HP displaces only about 1,140-cc. (It looks like Yamaha-USA has dropped this motor, as I can't find the specifications for it on their USA website anymore.) The Mercury monster motor displaces about 1,732-cc. There is an old bromide: "There's no replacement for displacement." Of course the monster Mercury gives back some performance from the weight--it has to weigh about five or six times as much as the Yamaha. Okay, some hyperbole. The Mercury 90-HP weighs 181-kg or 399-lbs; the Yamaha 90-HP weighs 120-kg or 264-lbs. That is still a very substantial difference in engine weight, about 136-lbs.
SC Joe	posted 03-28-2010 05:31 PM ET (US) That engine being stolen is perhaps the best thing that could happen to that boat. Where does someone have to park their boat for this unfortunate event to take place?
Clark Roberts	posted 03-29-2010 06:42 AM ET (US) The 90hp Mercury two stroke weighs approx. 304 lbs! NOT 399 lbs...beam me up... Clark...SCN
Clark Roberts	posted 03-29-2010 06:44 AM ET (US) I retract my above statement as I now see that it's the 90 Merc FOUR stroke being discussed. I should read more carefully, sorry! Clark