Prop recomendation - 90 yamaha 2s on 81 newport

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Author Topic:   Prop recomendation - 90 yamaha 2s on 81 newport

flawton posted 02-18-2003 10:02 AM ET (US)
Im about to pull the trigger on a new 90 2s yammy for my 17 newport. I need some recommendations from some of you that have the yammy 90 2s on a 17 hull (prop size and manufacturer Stainless). Im figuring on a gross weight of 1900 to 2000 lbs. (my friends & I aren't quite as light as we used to be). I don't need to catch the water on fire but would like the boat to perform well and breathe easy (i wont be doing a lot of watersking). I just don't want the dealer to slap on any prop and say here you go. I realize this is a difficult topic with many different answers but any help would be greatly appreciated.
stagalv posted 02-18-2003 10:23 AM ET (US)
I dont have the same engine as you but would think that a 13x19 would be fairly close to what you need. That may be a place to start.
There are plenty of threads on prop sizes and your Yam 90 is a very popular engine for the 17ft hull. Check out some of the older conversations available on this site for some more details.
Bigshot posted 02-18-2003 11:05 AM ET (US)
Get an OEM yamaha Stainless prop in a 13x17 and she will hit redline at light load. so when loaded down it will still be in the proper range. Had the same setup on a Montauk and it was perfect sized prop.
Montauk posted 02-18-2003 11:41 AM ET (US)
I agree with Bigshot. I am running A 90hp Yamaha on a 1973 Montauk with a 13 1/4 x 17 aluminum and it does a great job. Stays on plane at low speeds in rough water, with a top speed of 38.6 mph (gps).
Bigshot posted 02-18-2003 12:10 PM ET (US)
FYI....mine would GOs at about 41.5 with light load at 54-5500 rpm.
Montauk posted 02-18-2003 02:09 PM ET (US)
Bigshot,
I think the difference in speed is due to 2 factors.
1. My motor was mounted tight to the transom and should have been raised up an inch at least.
2. The presmirk transom has a negative angle and does not allow the engine to be trimmed properly.
After installing a Jackplate there was a world of difference in the performance of my Montauk
Bigshot posted 02-18-2003 04:17 PM ET (US)
Cool! That Yammie is a great engine for that hull. If I was to ever repower with a 2 stroke(not!) I would get one again, not as fast or powerful as a OMC 90hp but also gets 25%+/- better fuel milage.
flawton posted 02-19-2003 10:27 PM ET (US)
Thanks for the replies. I know that there are a bunch of cons with the 2s nowadays. About 6 weeks ago, on the first morning of Cache River duck hunting in Arkansas (by boat), we had a discussion about the 2s vs. 4s. It was finally agreed that in a strange way we like the smell of a 2s. Odd I know. Flame away but I will 2s ya.
Bigshot posted 02-20-2003 11:14 AM ET (US)
I miss the smell of 2 stroke in the morning.

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Author	Topic: Prop recomendation - 90 yamaha 2s on 81 newport
flawton	posted 02-18-2003 10:02 AM ET (US) Im about to pull the trigger on a new 90 2s yammy for my 17 newport. I need some recommendations from some of you that have the yammy 90 2s on a 17 hull (prop size and manufacturer Stainless). Im figuring on a gross weight of 1900 to 2000 lbs. (my friends & I aren't quite as light as we used to be). I don't need to catch the water on fire but would like the boat to perform well and breathe easy (i wont be doing a lot of watersking). I just don't want the dealer to slap on any prop and say here you go. I realize this is a difficult topic with many different answers but any help would be greatly appreciated.
stagalv	posted 02-18-2003 10:23 AM ET (US) I dont have the same engine as you but would think that a 13x19 would be fairly close to what you need. That may be a place to start. There are plenty of threads on prop sizes and your Yam 90 is a very popular engine for the 17ft hull. Check out some of the older conversations available on this site for some more details.
Bigshot	posted 02-18-2003 11:05 AM ET (US) Get an OEM yamaha Stainless prop in a 13x17 and she will hit redline at light load. so when loaded down it will still be in the proper range. Had the same setup on a Montauk and it was perfect sized prop.
Montauk	posted 02-18-2003 11:41 AM ET (US) I agree with Bigshot. I am running A 90hp Yamaha on a 1973 Montauk with a 13 1/4 x 17 aluminum and it does a great job. Stays on plane at low speeds in rough water, with a top speed of 38.6 mph (gps).
Bigshot	posted 02-18-2003 12:10 PM ET (US) FYI....mine would GOs at about 41.5 with light load at 54-5500 rpm.
Montauk	posted 02-18-2003 02:09 PM ET (US) Bigshot, I think the difference in speed is due to 2 factors. 1. My motor was mounted tight to the transom and should have been raised up an inch at least. 2. The presmirk transom has a negative angle and does not allow the engine to be trimmed properly. After installing a Jackplate there was a world of difference in the performance of my Montauk
Bigshot	posted 02-18-2003 04:17 PM ET (US) Cool! That Yammie is a great engine for that hull. If I was to ever repower with a 2 stroke(not!) I would get one again, not as fast or powerful as a OMC 90hp but also gets 25%+/- better fuel milage.
flawton	posted 02-19-2003 10:27 PM ET (US) Thanks for the replies. I know that there are a bunch of cons with the 2s nowadays. About 6 weeks ago, on the first morning of Cache River duck hunting in Arkansas (by boat), we had a discussion about the 2s vs. 4s. It was finally agreed that in a strange way we like the smell of a 2s. Odd I know. Flame away but I will 2s ya.
Bigshot	posted 02-20-2003 11:14 AM ET (US) I miss the smell of 2 stroke in the morning.