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Author Topic:   MONTAUK, 90-HP Johnson; What STILETTO

hench posted 07-29-2011 11:30 AM ET (US)
Now it's time to replace the original aluminum 13 x 17 propeller on the [1995] Montauk with Johnson 90-HP Ocean Runner. Last night with three people wide-open throttle was 5,000-RPM in perfect conditions. I'm thinking the propeller is getting a little old and tired. Specification for the engine redline is 5,500-RPM. If I opt for the Stiletto Advantage I, which seems to be the propeller of our reader's choice, I'm confused: do I opt for a 15, 17 or 19 pitch?
Tom W Clark posted 08-01-2011 03:48 PM ET (US)
You want the 13-1/4" x 15" Stiletto Advantage 4.25.
if the motor is mounted all the way down on the transom, as I suspect it is, it needs to be raised either 1-1/2" or 2-1/4".
if you do this, it will seem as if you have a new boat.
hench posted 08-09-2011 02:38 PM ET (US)
Tom, thank you. I was wrong, the existing is aluminum 14 x 19. What is the optimum mounting height of the engine? What do I measure? Is the existing mounting height changed by relocating the steel rod in the motor bracket from the current hole location #1 to position #2-6?
Tom W Clark posted 08-10-2011 12:18 AM ET (US)
The tilt pin does not affect the motor's height, it only limits its tilt range at the lower end.
Your Johnson 90 has four set of bolt holes in the motor mounting bracket. The motor is bolted to the transom with one of these four sets of holes.
To raise the motor you remove the mounting bolts and reinstall them in a lower set of holes. It is very easy to do so long as your motor is not making use of OMC's auxilliary or "blind" mounting hole. If that is the case, you need to drill two new bolt holes, again, a very easy task.
Tohsgib posted 08-10-2011 12:38 PM ET (US)
19" explains your 5k redline. The new prop will get you close to 5500 and your holeshot will be dramatically faster.
hench posted 06-08-2015 02:36 PM ET (US)
will the stainless steel prop be too heavy for for a gearcase designed for an aluminum prop?
Tom W Clark posted 06-09-2015 12:00 PM ET (US)
Your gearcase is designed for a stainless steel propeller and will be just fine.
In fact, Johnson and Evinrude outboards have been designed for stainless steel propellers since 1973

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Author	Topic: MONTAUK, 90-HP Johnson; What STILETTO
hench	posted 07-29-2011 11:30 AM ET (US) Now it's time to replace the original aluminum 13 x 17 propeller on the [1995] Montauk with Johnson 90-HP Ocean Runner. Last night with three people wide-open throttle was 5,000-RPM in perfect conditions. I'm thinking the propeller is getting a little old and tired. Specification for the engine redline is 5,500-RPM. If I opt for the Stiletto Advantage I, which seems to be the propeller of our reader's choice, I'm confused: do I opt for a 15, 17 or 19 pitch?
Tom W Clark	posted 08-01-2011 03:48 PM ET (US) You want the 13-1/4" x 15" Stiletto Advantage 4.25. if the motor is mounted all the way down on the transom, as I suspect it is, it needs to be raised either 1-1/2" or 2-1/4". if you do this, it will seem as if you have a new boat.
hench	posted 08-09-2011 02:38 PM ET (US) Tom, thank you. I was wrong, the existing is aluminum 14 x 19. What is the optimum mounting height of the engine? What do I measure? Is the existing mounting height changed by relocating the steel rod in the motor bracket from the current hole location #1 to position #2-6?
Tom W Clark	posted 08-10-2011 12:18 AM ET (US) The tilt pin does not affect the motor's height, it only limits its tilt range at the lower end. Your Johnson 90 has four set of bolt holes in the motor mounting bracket. The motor is bolted to the transom with one of these four sets of holes. To raise the motor you remove the mounting bolts and reinstall them in a lower set of holes. It is very easy to do so long as your motor is not making use of OMC's auxilliary or "blind" mounting hole. If that is the case, you need to drill two new bolt holes, again, a very easy task.
Tohsgib	posted 08-10-2011 12:38 PM ET (US) 19" explains your 5k redline. The new prop will get you close to 5500 and your holeshot will be dramatically faster.
hench	posted 06-08-2015 02:36 PM ET (US) will the stainless steel prop be too heavy for for a gearcase designed for an aluminum prop?
Tom W Clark	posted 06-09-2015 12:00 PM ET (US) Your gearcase is designed for a stainless steel propeller and will be just fine. In fact, Johnson and Evinrude outboards have been designed for stainless steel propellers since 1973