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Author Topic:   Johnson 90 update
masbama posted 04-24-2002 10:15 PM ET (US)   Profile for masbama   Send Email to masbama  
I'm gonna give an update on my 2002 Bomb/Johnson 2 stroke 90 on my Montauk. I have 9 hours on it. With just me in the boat I read 40 knots @5200 RPM's swingin' a 14 by 19" Aluminum prop. Incredible hole shot-almost jumps out of the water. Midrange power is great-going from 25 to 35 knots. Starts right up with the Fast Start. Great motor, runs smooth and is powerful and quiet (for a 2 stroke). Johnson is back!
Landlocked posted 04-24-2002 10:20 PM ET (US)     Profile for Landlocked  Send Email to Landlocked     
Mas -

It will be interesting to compare some numbers on our motors after we complete the break in. Fuel economy, top speed etc.

I've alway had Johnson's - this is my first Merc.

Best of Luck


masbama posted 04-24-2002 11:08 PM ET (US)     Profile for masbama  Send Email to masbama     
I agree Ll. Every thing sounds very much the same. I forgot to add that I experienced the same torque pull as you did. I had it adjusted also. Both are basic, well made motors.
whalerron posted 04-25-2002 11:53 AM ET (US)     Profile for whalerron  Send Email to whalerron     

I just installed a brand new 2001 Johnson 90 2 stroke with a 14x19 aluminum prop. According to my GPS, our speeds are identical. When I punch the throttle, anything that isn't tied down is going swimming. I have only put 3 hours on the engine but so far, it uses less fuel than my 1975 Johnson 70 did and it is much quieter. It is also smoother but I attribute that to the V configuration. At about 4000 rpms, that motor just hums. So far, I feel it is a great match for the 16' 7" whalers.

- ron

Landlocked posted 04-25-2002 04:43 PM ET (US)     Profile for Landlocked  Send Email to Landlocked     
If 40 knots = 46mph, You're getting a lot more speed than me. Not sure switching to a 19" pitch prop will get me that much speed.


whalerron posted 04-25-2002 05:37 PM ET (US)     Profile for whalerron  Send Email to whalerron     
Now I see that he said "knots". I am doing about 40 mph at 5200....
Julius Bosco posted 04-25-2002 09:56 PM ET (US)     Profile for Julius Bosco  Send Email to Julius Bosco     

Congrats. on your new motor!! I think you did well. Did you get the optional VRO installed for your price? I really like that engine. My dealer tells me the 60 degree block runs much smoother than the older 90 degree motors. Enjoy!! Julius

masbama posted 04-26-2002 11:14 AM ET (US)     Profile for masbama  Send Email to masbama     
I did not get the optinal oil injection-I wanted to keep it as simple as possible and not take up any valuable console/floor space (battery already in console) I have no problem with pre-mixing-neither does Bombardier. My speeds were on a glassy river with just me in it. I trimmed it up to get there-almost too fast-wont do it again unless needed. I like the 4000 rpm cruising speed. These 60 degree engines are must smoother than the old 90 degree crossflows.
whalerron posted 04-26-2002 12:09 PM ET (US)     Profile for whalerron  Send Email to whalerron     
Landlocked, it will be interesting to see how your top speeds would compare using the same prop that masbama is running. The Merc has a gear ratio of 2.3:1 so at 5200 rpms, the prop would be turning 2261 rpms. The Johnson has a 2.0:1 gear ratio so the prop on the Johnson would be turning 2600 rpms. In theory, with identical props, boats and loading, the Johnson should be a faster motor.
whalernut posted 04-28-2002 12:10 PM ET (US)     Profile for whalernut  Send Email to whalernut     
I get horrible gas mileage on my Currituck with a 1975 85 h.p. Johnson they just eat fuel, but she is still running strong!! Congratulations on your New purchases!! Jack.
Landlocked posted 04-28-2002 10:51 PM ET (US)     Profile for Landlocked  Send Email to Landlocked     
I just hope I can get the same 22 years out of my new Merc that I did out of my ol' Johnson 85.

Speed is secondary.


masbama posted 04-29-2002 10:42 AM ET (US)     Profile for masbama  Send Email to masbama     
Hey Nut! Your 1975 is the old cross flow design-my 2002 is the 60 degree loop charged. Much more efficient.
andygere posted 04-29-2002 01:44 PM ET (US)     Profile for andygere  Send Email to andygere     
Landlocked, what did you do with your old 85? Mine is still running strong, but I may need some parts eventually (I'm a little worried about the T/T since the boat is kept in salt water).
Landlocked posted 04-29-2002 02:57 PM ET (US)     Profile for Landlocked  Send Email to Landlocked     
A buddy is going to attempt to mount it on the back of a 16' Monarch Work barge. I told him to try it and see if he could make it work (probably too big), if not bring it back. So far, haven't seen it or the $250 he promised me for it.

I'll let you know if I get it back.


Eric posted 05-03-2002 10:02 PM ET (US)     Profile for Eric  Send Email to Eric     
On my Nauset I've got a 99 model, with 63 hours and VRO. You're going to love the difference in fuel consumption compared to the old V4s. I usually get 2.4 to 2.9 gallons/hour. Just repitched my 13 3/8 Viper prop to a 19. It's been too rough to run it out any distance yet, but it's hit 44.1 mph.
Alan Hiccock posted 05-04-2002 08:55 PM ET (US)     Profile for Alan Hiccock  Send Email to Alan Hiccock     
I had a '99 90 Johnson that I bought new on my Carolina Skiff that never failed me.
Sold the rig with 400 hrs running like new.
OMC's v 4's are a great motor, Alan

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