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Author Topic:   4 bladed prop for 2001 Johnson OceanPro
knothead posted 08-31-2001 06:20 PM ET (US)   Profile for knothead   Send Email to knothead  
I recently repowered my 1988 montauk with a new 90 hp johnson OceanPro. The prop off the old 90 hp Evinrude was a SST 13x19. However it was fairly dinged up so while ith was at the prop shop I bought a 4 bladed 12.75 X 17 Comprop to experiment with. I'm mostly loading the boat with kids, ages 8-12, and skiing, tubing,and wakeboarding so top speed is not an issue,but hole shot and pulling power is. I've been pleased with the performance of the ComProp but want a 4 bladed stainless. I've tried Mercury and was told that their props would not fit my motor.From reading this forum, I know that some of you guys have been around J&E and Montauks for years. Any ideas? WOT with the 4 bladed Comprop is 5700rpms with 3 people lightly loaded. WOT with the SST 13 x 19 is 5100rpms. The speedo does not work so I have no input there, but high speed is not important. Having sailed big boats for years anything over 12 knots seems fast to me. Thanks for your help.
Dick posted 08-31-2001 10:37 PM ET (US)     Profile for Dick  Send Email to Dick     
I have been away from the dealership for a while now, but as I remember Mercury offers inserts for all of their props to fit most engines. Johnson/Evinrude was one of the first that they offered the inserts for.

Check with another Merc dealer.

dgp posted 09-01-2001 08:07 AM ET (US)     Profile for dgp  Send Email to dgp     
Or call Mercury Technical Service for prop recommendations at 920-929-5040.
bigz posted 09-01-2001 09:40 AM ET (US)     Profile for bigz    
Don,Dick,and KH, I did a quick check appears no one makes a 4 blade other than a comprop for a 90. Merc, OMC, Michigan and Power Tech= no dice. Of course someone some where might.

Chuckle my old prop man Mr. C Roberts could tell us the why when where fors on a 4 blade for a 90. If he's around --

knothead posted 09-01-2001 04:36 PM ET (US)     Profile for knothead  Send Email to knothead     
I have spoken with Mercury Technical Services, they're the ones that told me that a Mercury Prop would not fit inside the lip of the lower unit of a Johnson 90. I thought about buying a Mercury prop, taking it to a machine shop and having the barrel turned down on a lathe so that it would fit, even asked Mercury, but drew a blank. Well, gotta go to the beach, the weather is improving. Thanks
bigz posted 09-03-2001 10:10 AM ET (US)     Profile for bigz    
Just for the heck of it a previous thread on mid range 4 blade props might be of insterest

SuburbanBoy posted 09-03-2001 02:13 PM ET (US)     Profile for SuburbanBoy  Send Email to SuburbanBoy     
Check the following URL for a Stainless OMC 4-blader. It is called a Renegade Bass Prop, available from OMC. It may not be suitable for your boat, I would call them for tech support.

Good Luck!


lhg posted 09-04-2001 07:04 PM ET (US)     Profile for lhg    
Mercury's excellent props are have been available for any brand of engine for several years now, as Dick has correctly indicated. They all have intechangeable center hubs for various engine brands.

For the mid range 4 1/4" gearcase outboards, Mercury does make a 4 bladed "Trophy Plus" prop, but I wouldn't use it. Try the 3 bladed Laser II or 5 blades "High Five" (best for water skiing) instead. One of these will cost you about $390 bought right ( The other limitation is that these are not made in less than 20" pitch, and the engine should be raised about 1 1/2" (2 bolt holes). If you can't turn 20" of pitch, you would have to use a Merc "Vengeance" prop, 18" pitch.

Another brand of 4 blade SS to consider is Stilleto.

Forget Comp Props. They are an overrated waste of money, and flex out under load, wasting your HP. They are only meant for back up "get-home" duty.

TightPenny posted 09-05-2001 10:04 AM ET (US)     Profile for TightPenny  Send Email to TightPenny     
I have a 90hp 2001 Johnson OceanPro on my Montauk.

WOT rating is for 5500 RPM on that engine.

I use a 17" pitch Michigan Wheel Rampage.

Depending on loading and on water conditions I have maxed it out at about 37 knots and about 5200 RPM.

knothead posted 09-05-2001 05:58 PM ET (US)     Profile for knothead  Send Email to knothead     
Thanks to all!!

I called Mercury again, I'd really like to use a High Five,figured I could get it re-pitched to 18" but was told again that it would not fit. I'm rather hesistant to spend the $$ for a prop that may not work, that's why I experimented with the ComProp, Cheap to try and can keep it as a spare.

The other issue that I'm dealing with is that the of the four bolts holding the motor to the transom, only the top two come thru the motor bracket with nuts. The lower two bolts apparently thread directly into the motor bracket itself. I beleive that the old Evenrude mounted this way as well, as there were no new holes drilled when the new motor was mounted.

My question is; Will I need to drill new bottom holes in the transom in order to raise the motor? It appears that if I can find a high performance prop, I'll need to raise the motor. I'm somewhat leary of a jackplate or bracket as the boat is moored in salt water during July and August.

Maybe I"m "tilting at windmills", just buy a three bladed stainless and forget about the issue. I'm just convinced that for most of what I'm doing with the boat, i.e pulling wakeboarders at 18-20 mph with a loaded boat,or playing in the ocean around the inlet, a 4 or 5 bladed prop makes the most sense. At least this is what the literature says.

Thanks for your responses, from reading this website during the past few months, I've been able use you all's combined advise to upgrade the boat, re-mount the rails, move and upgrade the batteries, rewire the boat, and generally make it look new.

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