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Author Topic:   MONTAUK 17, 90-HP FOURSTROKE

queenfish posted 08-23-2010 10:57 AM ET (US)
My buddies and I just bought a great little 1987 Montauk as a boat to keep stored down in Baja. It's in great shape and has a 2003 Mercury 90-HP FOURSTROKE and a 2006 Yamaha 8-HP four-cycle auxiliary. The aluminum propeller on the Mercury is dinged up, so we thought we'd get a new one. The propeller does not have any kind of markings indicating what size it is. It pushes the boat just fine. I have had several chances to get used stainless steel propeller but want to get the right one, or as close as possible. It seems like three-blade 13 X 19 or 13 X 20 propellers are readily available. I saw one that was a 13 X 15. Would these probably work? We need it for fishing, trolling and carrying three big guys. Thanks guys.
Mark
Of course I still have my trusty 1985 Outrage for use here in San Diego, too.

Fishmore posted 08-23-2010 11:50 AM ET (US)
Considering the weight you are carrying, I would look for a 13.25 x 17p in an aluminum BLACK MAX or 13.25 x 15p in a stainless steel Stiletto ADVANTAGE-1. If the old propeller is a Mercury Black Max, you can take it off, and on the backside of the propeller on the hub casting is the size.
As you are starting out with [over] 500-lbs of weight on the stern, and, if your batteries are on the transom, maybe up to 600-lbs, you better not have more than one big guy in the stern at any one time. Especially if you are hauling in some big tuna. Otherwise, you will be getting some water over the transom.
Before leaving the states you may consider swapping out that 400-lb Mercury 90-HP for a 267-lb Yamaha T60 or F70 to match your kicker motor and in the process shave 130-lbs off the transom. While you are at it move the battery or batteries into the console and you will save another 50 to 100-lbs. Now, when you have two guys in the back trying to gaff and fight a fish, you are less likely to have a problem with water over the transom.
Other than the weight of those motors that sounds like a dream come true to me.
queenfish posted 08-23-2010 12:14 PM ET (US)
We did move the batteries to the console. On a propeller the first number is the diameter, right? Then the second is the pitch, right?
[Something] is a lot of weight. I owned this same boat for 25-years with just a 90-HP two-cycle; it was wonderful.
This MONTAUK came with these engines, and it was such a good deal we couldn't pass it up. We'll have to gaff the tuna from the front of the boat I guess.
Tohsgib posted 08-23-2010 12:16 PM ET (US)
Somebody will pipe in with what they have exactly. These engines have a higher gear ratio so I doubt a 15" would be ideal. If under normal loads most run a 20" Laser, I would go with a 17" Stiletto.
Dick E posted 08-23-2010 06:58 PM ET (US)
I have a 1998 Montauk with Mercury 90-HP [two-cycle] [a different engine completely--jimh]. I tested three propellers. standard aluminum 13x 21 that came with the boat, a Stiletto 13 x 19, and Mercury LASER 13 x 20.
The LASER is the best for handling and top speed at 42-MPH with two people and a light load; maximum RPM 5,300. You want to be on the high end of the maximum RPM range. I believe the maximum RPM is 6,000 RPM WOT [for the FOURSTROKE]. Maybe too much pitch for you and you may want to step down a size in pitch.
Fishmore posted 08-23-2010 11:21 PM ET (US)
Queenfish, yes first number is diameter and second number is pitch.
I did recommend a smaller pitch than normal because of the amount of weight I was thinking you would carry with motors, batteries, gear, food, fuel, bait, 3 guys, a bunch of big tuna maybe as high as 1900lbs plus the hull weight.

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Author	Topic: MONTAUK 17, 90-HP FOURSTROKE
queenfish	posted 08-23-2010 10:57 AM ET (US) My buddies and I just bought a great little 1987 Montauk as a boat to keep stored down in Baja. It's in great shape and has a 2003 Mercury 90-HP FOURSTROKE and a 2006 Yamaha 8-HP four-cycle auxiliary. The aluminum propeller on the Mercury is dinged up, so we thought we'd get a new one. The propeller does not have any kind of markings indicating what size it is. It pushes the boat just fine. I have had several chances to get used stainless steel propeller but want to get the right one, or as close as possible. It seems like three-blade 13 X 19 or 13 X 20 propellers are readily available. I saw one that was a 13 X 15. Would these probably work? We need it for fishing, trolling and carrying three big guys. Thanks guys. Mark Of course I still have my trusty 1985 Outrage for use here in San Diego, too.
Fishmore	posted 08-23-2010 11:50 AM ET (US) Considering the weight you are carrying, I would look for a 13.25 x 17p in an aluminum BLACK MAX or 13.25 x 15p in a stainless steel Stiletto ADVANTAGE-1. If the old propeller is a Mercury Black Max, you can take it off, and on the backside of the propeller on the hub casting is the size. As you are starting out with [over] 500-lbs of weight on the stern, and, if your batteries are on the transom, maybe up to 600-lbs, you better not have more than one big guy in the stern at any one time. Especially if you are hauling in some big tuna. Otherwise, you will be getting some water over the transom. Before leaving the states you may consider swapping out that 400-lb Mercury 90-HP for a 267-lb Yamaha T60 or F70 to match your kicker motor and in the process shave 130-lbs off the transom. While you are at it move the battery or batteries into the console and you will save another 50 to 100-lbs. Now, when you have two guys in the back trying to gaff and fight a fish, you are less likely to have a problem with water over the transom. Other than the weight of those motors that sounds like a dream come true to me.
queenfish	posted 08-23-2010 12:14 PM ET (US) We did move the batteries to the console. On a propeller the first number is the diameter, right? Then the second is the pitch, right? [Something] is a lot of weight. I owned this same boat for 25-years with just a 90-HP two-cycle; it was wonderful. This MONTAUK came with these engines, and it was such a good deal we couldn't pass it up. We'll have to gaff the tuna from the front of the boat I guess.
Tohsgib	posted 08-23-2010 12:16 PM ET (US) Somebody will pipe in with what they have exactly. These engines have a higher gear ratio so I doubt a 15" would be ideal. If under normal loads most run a 20" Laser, I would go with a 17" Stiletto.
Dick E	posted 08-23-2010 06:58 PM ET (US) I have a 1998 Montauk with Mercury 90-HP [two-cycle] [a different engine completely--jimh]. I tested three propellers. standard aluminum 13x 21 that came with the boat, a Stiletto 13 x 19, and Mercury LASER 13 x 20. The LASER is the best for handling and top speed at 42-MPH with two people and a light load; maximum RPM 5,300. You want to be on the high end of the maximum RPM range. I believe the maximum RPM is 6,000 RPM WOT [for the FOURSTROKE]. Maybe too much pitch for you and you may want to step down a size in pitch.
Fishmore	posted 08-23-2010 11:21 PM ET (US) Queenfish, yes first number is diameter and second number is pitch. I did recommend a smaller pitch than normal because of the amount of weight I was thinking you would carry with motors, batteries, gear, food, fuel, bait, 3 guys, a bunch of big tuna maybe as high as 1900lbs plus the hull weight.