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  14x17 prop on '03 Johnson 90 2S on Montauk?

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Author Topic:   14x17 prop on '03 Johnson 90 2S on Montauk?
raygun posted 06-14-2003 02:34 AM ET (US)   Profile for raygun   Send Email to raygun  
The dealer who installed my motor (2003 Johnson 90 2S) put an OMC aluminum 14x17 prop on there. 5500 rpm 44mph with the motor all the way down on the transom. I just finished jacking the motor up a hole using the method Sal described with the 4x4.(thanks!)
The thing is, this prop has rather long narrow blades to it and seems like a weird design and diameter pitch combo compared to what folks are talking about on the site.The dealer gave me little model info, even when asked and asked, it was inexpensive, ran the right rpm and I was tired of listening to him babble about how a stainless prop would "damage my engine through galvanic corrosion". The dealer in question did a less than satisfactory job on the install and I really just wanted to get my boat out of there before he decided to drill anymore new holes. This prop appears to my untrained eye, and not knowing the model name, to have very little in the way of cupping. The blades actually look pointy.
Does anyone recognize this style prop?

I expected to get more top speed out of the boat with the new motor. I will measure what happens when I relaunch now that I am one hole up, but it seems to me that this prop's large diameter might be slowing me down.
Any input appreciated.
Ray

Sal DiMercurio posted 06-14-2003 08:31 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
It sounds like he put a cleaver prop on,......does it look like someone cut off about 1/3 of the back side of the blade ?
If so it's a cleaver,....pretty good props.
The guy is in lala land if he thinks a s/s prop is going to start electrolosis, what does he think the shaft that holds the prop on is made of,....it's s/s,...the guy is looney tunes & merry melodies.
Theres really no need for a 14" diameter on a 90 hp on a Montauk, i believe he must have had it hanging around & figured you wouldn't know the difference.
I believe that engine calls for a 13.25 diameter & you could probably get by with a 12.50 ...12.75 dia x 19 if you raise the engine up on the 3rd set of holes.
Sal
raygun posted 06-15-2003 09:48 PM ET (US)     Profile for raygun  Send Email to raygun     
Thanks for the reply Sal. I did figure it was something he had laying around, but as I said, I just wanted to get away from him. I really tried to get someone to sell me the motor in the crate, but nobody would who could get it in the time frame I desired. You should see the goofy wiring job he did I had to re-do. Are there any negative effects on the lower unit from this larger diameter wheel(ie. long term), or is my assumption that it is decreasing top speed the only problem? I do use the boat for some watersports pulling and don't want to lose hole shot. Keeping that in mind, any suggestions on a brand and size to try out first? Thanks,
Ray
Sal DiMercurio posted 06-15-2003 11:15 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Ray, let the engine break in first before trying anything new.
That prop is allowing the rpms to get where they need to be.
When you have enough break in hours on her see if you can borrow a 13.25 x 19 or a 12.75 x 19 & see if she likes either one of them.
I'm sure we can get more speed out of her.
Did anything improve by raising the enge ?
Watch your rpms now that the engine is up higher, she might over rev, don't let it happen, just back off the throttle.
It's very possible she might swing a 12.75 x 21.
If thats the case you should run right around 50 mph but may not have a rocket hole shot.
Sal
raygun posted 06-16-2003 03:02 AM ET (US)     Profile for raygun  Send Email to raygun     
I have about 20 hrs on the motor, I got towards the end of last season and am just late getting it back in this year.
Any particular brand I should try in the 13.25x19?
thanks,
Ray
Bigshot posted 06-16-2003 10:59 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Common prop on the newer engines. not a cleaver but not elephant eared either....different. Go with a 13x19 and lucky for you David Jenkins might be selling one. Look for the post about a max rpm too low, damage to engine, etc. in this forum.

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