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Author Topic:   90hp Johnson-advice needed......
masbama posted 11-19-2002 11:34 AM ET (US)   Profile for masbama   Send Email to masbama  
I'm thinking of changing props. I currently run a 14x19 Aluminum with my 2002 Johnson 2 stroke 90 on my 1977 Montauk. It works fine but I recently ran through a submerged mud flat and it chopped the prop up a bit. What size would you suggest in SSteel? Thanks!
In addition- the pee stream seems a bit weaker as a result. I tried cleaning out the hole but no change. I have taken it in to have checked and the dealer said it ran fine with a hose. Would you get a second opinion?
Seabrook posted 11-19-2002 12:00 PM ET (US)     Profile for Seabrook  Send Email to Seabrook     
Prop: 13.25" X 19" single cup for the stainless prop should be perfect. This is a very standard prop. My neighbor just bought a used one on Ebay for $165. New is about $300. The newer OMC V4s come with a 14" alum prop, but most stainless props to fit your motor are 13.25.

Pee Stream: Chances are that your cooling system is fine. You probably got some trash in the hose or fitting of the water indicator (pee stream). Easy enough to take off and blow it out. This is very common as the hose and fitting are one of the smaller passages for the water to pass through. Therefore, the trash/mud probably went straight through your engine with no problem, but got caught in the small diameter hose or fitting.

captbone posted 11-19-2002 12:10 PM ET (US)     Profile for captbone  Send Email to captbone     
The late 90s and later johnrudes all have that flushing port on the rear of the engine. You remove the plastic nut that contains that adjustable pee hole and the hose screws right in there. Hook up the hose and let it RUN!
captbone posted 11-19-2002 12:11 PM ET (US)     Profile for captbone  Send Email to captbone     
of coarse, let it run means the hose, do not start the engine like this, hook up the hose and forget about it for an hour.
masbama posted 11-19-2002 12:29 PM ET (US)     Profile for masbama  Send Email to masbama     
Thanks! I'll try it out when I get home this evening.
Bigshot posted 11-19-2002 01:52 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
What rpm are you running now? If you are at redline get the 19" SST, if under drop to a 17". I think that engine redlines at 5500.
lhg posted 11-19-2002 02:37 PM ET (US)     Profile for lhg    
Since you have a pretty fast rig, I would recommend you purchase a performance, higher raked SS prop, such as Stiletto, Rapture or Cabela's (I think made by Stiletto), also in 19" pitch. If you think you can handle even more pitch, the 20" Merc Laser II with OMC hub would be a screamer for you. Engine would have to be up 1 1/2" for this prop to function properly.

This style of prop will give you more bow lift, and hence a better ride. I would raise the engine 1 bolt hole, and you will not lose any holding over what you have with the aluminum. You're going to be surprised how much better the boat runs over that klunky aluminum prop.

knothead posted 11-19-2002 03:10 PM ET (US)     Profile for knothead  Send Email to knothead     

I have a 1988 Montauk with a 2001 Johnson.
I recently bought an unused old 13x19 SST stainless prop on e-bay for $97.00 delivered.

I had the boat out last Saturday, with 3 big boys on the boat WOT was 5800 RPM's. Don't know the speed, but it was fast. (No speedo's) I'm thinking that if I raise the motor I'll get more RPM's as the motor still throws a V-spray when on plane. The downside to all this is if I get more RPM's then I'll need a higher pitched prop.

Aah, the chicken and the egg. Decisions,decisions.

Regards, knothead

knothead posted 11-19-2002 03:18 PM ET (US)     Profile for knothead  Send Email to knothead     
Sorry- Just read my previous post. The motor is a 2001 Johnson 90


Seabrook posted 11-19-2002 04:20 PM ET (US)     Profile for Seabrook  Send Email to Seabrook     
I run a 13.25" X 21" SST on my Montauk but I have a 1982 115 Johnson. I will still run 5500 RPMs. Fast enough and planes quick.
masbama posted 11-19-2002 07:21 PM ET (US)     Profile for masbama  Send Email to masbama     
With my 14x19 I run 5200 WOT with just me, gas and fishing stuff. This engine is rated for 4500-5500 RPM's max. I don't want to go over at WOT.
Bigshot posted 11-20-2002 10:08 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Try a 13x19 SST. Should be perfect.
TightPenny posted 11-21-2002 08:53 AM ET (US)     Profile for TightPenny  Send Email to TightPenny     
My 2000 Montauk, with a 2001 Johnson 90 hp has a Michigan Wheel 17" Rapture SS prop.

37 knots (with only me on board) and around 5200-5300 RPM WOT. I question whether a taller prop will perform without all of the engine height tweaking and jack plating extras that some of the members use.

masbama posted 11-21-2002 11:21 AM ET (US)     Profile for masbama  Send Email to masbama     
Since I get 5200 rpms at WOT with my Aluminum 14x19 would a stainless steel 14x19 increase or decrease my rpms at WOT?
tully_mars posted 11-21-2002 12:26 PM ET (US)     Profile for tully_mars  Send Email to tully_mars     

On my Montauk I have the 13.25 x 17" and the 75 Bomb is running around 4900rpm WOT (Max is 5200). Stainless is heavier and does not flex so you get a better "bite" on the water, is shouldn't increase RPMs but should decrease them (Insignificantly usually). If you guys don't plan to do a lot of skiing etc a 14x19" SS will work. If you want to break some knecks and have lots of power get a 17 stainless.

If you want after Thanksgiving you guys are welcome to come over to the house and we will take a little ride in mine to see what you think of a 17" prop. As you know, our motors are fairly similar.

Tully Mars

masbama posted 11-23-2002 11:28 AM ET (US)     Profile for masbama  Send Email to masbama     
I would love to see the new set up. I hope it came out the way you wanted it to. I will wait until spring to change props; until then-infrequent use. Keep in touch!

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