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Author Topic:   Montauk 17, Yamaha 100-HP

justdocked posted 11-30-2006 03:41 PM ET (US)
First, I must say how simply overwhelmed I am at the vast knowledge and information I have found at this site since I purchased my Whaler in August. I truly do not wish to beat a dead horse. I have read many posts on this topic to the point of brain freeze. Alas, I am on a tight budget and can make zero to no mistakes when spending hard earned currency. I am picking up a propless 2000 Yamaha F100 this Saturday to power my powerless 1989 Montauk 17. There is a QUICKSILVER LASER II STAINLESS STEEL PROPELLER, 13-1/4" DIA X 20" PITCH for sale. The listing states P/N 48-16990A40, SUPERSEDES TO 48-16990A36. In my research I cannot determine if this is the same prop LHG recommends for this combo. Is it vented properly and does it have an interchangeable hub? Any additional comments or prop suggestions from knowledgeable folks and/or those with similar hull/motor combinations are GREATLY APPRECIATED.

SIM posted 11-30-2006 06:33 PM ET (US)
The last 17 Montauk we re-powered had a F80 Yamaha installed. The correct Yamaha prop for that boat was a 13x17 Yamaha black SS.
The F100 and F80 are the same engine with some minor differences to achieve the extra hp. I would say the 19p Black SS Yamaha would be a good starter prop testing wheel. I highly doubt you could spin the 13-1/4 x 20p and have the engine reach its rated WOT throttle of 6,000-RPM.
Andy
The Judge posted 12-01-2006 11:47 AM ET (US)
That is a big wheel to turn for a week 100hp engine(why they rebadged it a 90). I would think a 18 or so would be right. Somebody has to be running that combo here, be patient. Also that Laser has vent holes. I do not find them appealing on montauks.
Teak Oil posted 12-03-2006 08:59 AM ET (US)
A good idea is to start with an aluminum prop first, get some baseline performance numbers, and THEN make a decision on a stainless prop. You are going to want to have an aluminum prop for a backup anyways, since sometime in your ownership of your Montauk you will probably going to venture into unknown or rocky waters and not want to take a chance on hitting your stainless prop on something unforgiving.
Get yourself a Yamaha aluminum prop in the 13x18" range and see how the engine performs. If you can spin it to 6000 easily with a load in the boat, then your stainless prop can be in the 19" range.
Eddy G posted 12-05-2006 09:18 AM ET (US)
I started out with my existing Laser II 13-1/2" x 20" on my new F90 (came off of my Merc 90 2 stroke). With two people in the boat it wouldn't reach 6000 rpm. I installed a Power Tech 17" SS prop. With six people it will slightly exceed 6000 rpm. With two it's overkill. If you will only have two people most of the time, the 19" would probably be ok. More that two and you best get the 17" These engine do not respond well to over propping. Be sure your tach is accurate and that the engine will get no less than 6000 rpm at your normal full load. I will most likely have a prop shop repitch my 17" to 18" which in my opinion would be the best pitch for the Montauk / F90 combination.
Eddy G.
David Livingstone posted 12-05-2006 11:37 AM ET (US)
Justdocked, I run a F100 on a Montauk with a 13.25 X 19 SS and can't reach 6000RPM. I run outside in coastal chop and have a problem with the engine "making oil" because she doesn't turn up enough. 13.5 X 20 will be away too much for your setup.
David
David Livingstone posted 12-05-2006 11:38 AM ET (US)
I meant to say 13.25 X 20
Eddy G posted 12-05-2006 12:37 PM ET (US)
David: Mine was occasionally making oil also with the 20" pitch prop (depended on the load). About 30 hours on the 17" pitch with no oil increase. These 4 stroke engines sure are smooth, give good performace and easy on the fuel, but they are sensitive to over propping. I also installed the large Yamaha spin on fuel filter which I was told may prevent the fuel injectors from leaking down into the cylinders after shutting off the engine. Another possible cause of "making oil".
Eddy G.
justdocked posted 12-08-2006 08:46 PM ET (US)
I appreciate all of the input. I'm in no rush. I will commence rigging the motor to the boat or engine to the vessel this weekend. Should the 19 pitch prop allow the motor to reach 6000RPM? I will probably carry 1 passenger and myself some of the time, and just myself and gear most of the time. I live on the Indian River Lagoon and the shallow draft of the Montauk attracted me to the hull. The Yamaha may be a little heavy, but I was able to get the motor at a better deal than I initially anticipated. The guy tossed in a CMC manual jacking plate that must weigh 40lbs (Don't know if I want to add the extra weight). Thus far, it seems that I should be in the 18-19 pitch range with an SS prop.
The LaserII is out of the picture with a minimum pitch of 20. Is there a distinct advantage to sticking with Yamaha SWS or Mercury excluding resale? Are there any recommendations on brands as well as pitch for my application?

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Author	Topic: Montauk 17, Yamaha 100-HP
justdocked	posted 11-30-2006 03:41 PM ET (US) First, I must say how simply overwhelmed I am at the vast knowledge and information I have found at this site since I purchased my Whaler in August. I truly do not wish to beat a dead horse. I have read many posts on this topic to the point of brain freeze. Alas, I am on a tight budget and can make zero to no mistakes when spending hard earned currency. I am picking up a propless 2000 Yamaha F100 this Saturday to power my powerless 1989 Montauk 17. There is a QUICKSILVER LASER II STAINLESS STEEL PROPELLER, 13-1/4" DIA X 20" PITCH for sale. The listing states P/N 48-16990A40, SUPERSEDES TO 48-16990A36. In my research I cannot determine if this is the same prop LHG recommends for this combo. Is it vented properly and does it have an interchangeable hub? Any additional comments or prop suggestions from knowledgeable folks and/or those with similar hull/motor combinations are GREATLY APPRECIATED.
SIM	posted 11-30-2006 06:33 PM ET (US) The last 17 Montauk we re-powered had a F80 Yamaha installed. The correct Yamaha prop for that boat was a 13x17 Yamaha black SS. The F100 and F80 are the same engine with some minor differences to achieve the extra hp. I would say the 19p Black SS Yamaha would be a good starter prop testing wheel. I highly doubt you could spin the 13-1/4 x 20p and have the engine reach its rated WOT throttle of 6,000-RPM. Andy
The Judge	posted 12-01-2006 11:47 AM ET (US) That is a big wheel to turn for a week 100hp engine(why they rebadged it a 90). I would think a 18 or so would be right. Somebody has to be running that combo here, be patient. Also that Laser has vent holes. I do not find them appealing on montauks.
Teak Oil	posted 12-03-2006 08:59 AM ET (US) A good idea is to start with an aluminum prop first, get some baseline performance numbers, and THEN make a decision on a stainless prop. You are going to want to have an aluminum prop for a backup anyways, since sometime in your ownership of your Montauk you will probably going to venture into unknown or rocky waters and not want to take a chance on hitting your stainless prop on something unforgiving. Get yourself a Yamaha aluminum prop in the 13x18" range and see how the engine performs. If you can spin it to 6000 easily with a load in the boat, then your stainless prop can be in the 19" range.
Eddy G	posted 12-05-2006 09:18 AM ET (US) I started out with my existing Laser II 13-1/2" x 20" on my new F90 (came off of my Merc 90 2 stroke). With two people in the boat it wouldn't reach 6000 rpm. I installed a Power Tech 17" SS prop. With six people it will slightly exceed 6000 rpm. With two it's overkill. If you will only have two people most of the time, the 19" would probably be ok. More that two and you best get the 17" These engine do not respond well to over propping. Be sure your tach is accurate and that the engine will get no less than 6000 rpm at your normal full load. I will most likely have a prop shop repitch my 17" to 18" which in my opinion would be the best pitch for the Montauk / F90 combination. Eddy G.
David Livingstone	posted 12-05-2006 11:37 AM ET (US) Justdocked, I run a F100 on a Montauk with a 13.25 X 19 SS and can't reach 6000RPM. I run outside in coastal chop and have a problem with the engine "making oil" because she doesn't turn up enough. 13.5 X 20 will be away too much for your setup. David
David Livingstone	posted 12-05-2006 11:38 AM ET (US) I meant to say 13.25 X 20
Eddy G	posted 12-05-2006 12:37 PM ET (US) David: Mine was occasionally making oil also with the 20" pitch prop (depended on the load). About 30 hours on the 17" pitch with no oil increase. These 4 stroke engines sure are smooth, give good performace and easy on the fuel, but they are sensitive to over propping. I also installed the large Yamaha spin on fuel filter which I was told may prevent the fuel injectors from leaking down into the cylinders after shutting off the engine. Another possible cause of "making oil". Eddy G.
justdocked	posted 12-08-2006 08:46 PM ET (US) I appreciate all of the input. I'm in no rush. I will commence rigging the motor to the boat or engine to the vessel this weekend. Should the 19 pitch prop allow the motor to reach 6000RPM? I will probably carry 1 passenger and myself some of the time, and just myself and gear most of the time. I live on the Indian River Lagoon and the shallow draft of the Montauk attracted me to the hull. The Yamaha may be a little heavy, but I was able to get the motor at a better deal than I initially anticipated. The guy tossed in a CMC manual jacking plate that must weigh 40lbs (Don't know if I want to add the extra weight). Thus far, it seems that I should be in the 18-19 pitch range with an SS prop. The LaserII is out of the picture with a minimum pitch of 20. Is there a distinct advantage to sticking with Yamaha SWS or Mercury excluding resale? Are there any recommendations on brands as well as pitch for my application?