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 Post subject: Johnson 90/65 Opinions?
PostPosted: 02 Feb 2018, 12:40 
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Joined: 02 Jun 2015, 09:56
Posts: 476
Location: Bedford Indiana
on a light riveted boat that thing will scoot I will be in virginia come sunday should have the weekend of the 10-11 free hit me up if your throwing that thing on then.


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 Post subject: Johnson 90/65 Opinions?
PostPosted: 02 Feb 2018, 12:53 
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Joined: 02 Jun 2015, 09:56
Posts: 476
Location: Bedford Indiana
on a light riveted boat that thing will scoot I will be in virginia come sunday should have the weekend of the 10-11 free hit me up if your throwing that thing on then.


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 Post subject: Johnson 90/65 Opinions?
PostPosted: 08 Feb 2018, 12:06 

Joined: 28 Sep 2014, 09:02
Posts: 255
Location: Charlottesville, VA
handyandy wrote:
on a light riveted boat that thing will scoot I will be in virginia come sunday should have the weekend of the 10-11 free hit me up if your throwing that thing on then.


Hey thats cool man! You gonna be in VA for a while? Let me know if ya wanna stop by and check out my operation. Got quite a few boats/motors I am working on now.

Buddy backed out on the Lowe, so I am still on the hunt for a decent 17-18' hull. Lots of trackers around here but they are rated for 50hp and .80 gauge boats. Not sure I want to test them out on the rock shoals of the James............


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 Post subject: Johnson 90/65 Opinions?
PostPosted: 13 Feb 2018, 10:17 

Joined: 28 Sep 2014, 09:02
Posts: 255
Location: Charlottesville, VA
Samsdad1 wrote:
pics of the boat after much work...


Hey boss, what is the width at the bottom of your boat??


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 Post subject: Johnson 90/65 Opinions?
PostPosted: 14 Feb 2018, 14:19 

Joined: 26 Oct 2017, 09:46
Posts: 21
I will have to measure this evening...


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 Post subject: Johnson 90/65 Opinions?
PostPosted: 06 Mar 2018, 16:31 

Joined: 28 Sep 2014, 09:02
Posts: 255
Location: Charlottesville, VA
So plans have changed. I am slapping the 80 jet (65) on the grizzly. Shes rated for 75HP so I think shell handle her. Got tired of looking for a decent hull.

I have decided to get a fiberglass CC with my 7 grand and just slap this motor on the Grizz and take my 50hp off there.


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 Post subject: Johnson 90/65 Opinions?
PostPosted: 15 Mar 2018, 14:09 

Joined: 26 Oct 2017, 09:46
Posts: 21
forgot to respond with measurements... Bottom is roughly 60"... Good luck with the new motor. just finished painting mine and putting numbers on... cannot wait until I get it out... Maybe Saturday.


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 Post subject: Johnson 90/65 Opinions?
PostPosted: 19 Mar 2018, 17:23 

Joined: 28 Sep 2014, 09:02
Posts: 255
Location: Charlottesville, VA
Looks good man. You gonna UHMW the bottom or risk it?


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 Post subject: Johnson 90/65 Opinions?
PostPosted: 28 Mar 2018, 11:21 

Joined: 26 Oct 2017, 09:46
Posts: 21
UHMW is cost prohibitive for now... so I will risk it... that is why I have insurance on it...


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 Post subject: Johnson 90/65 Opinions?
PostPosted: 24 Apr 2018, 15:26 

Joined: 28 Sep 2014, 09:02
Posts: 255
Location: Charlottesville, VA
Well fellas, after 5 months of using up much of my spare time and energy on this conversion, she is finally ready to roll!! Got her set up and installed this past Friday and took her to the water on Sunday. Had her weighed down at tournament weight and we were doing 32mph. 2 People, 3 batteries, 12 gallons of gas, full fishing gear, cooler, livewell and 2 people and we were doing 32mph. I just need to add a splash plate on her. Think I got the height set right 1st try, so that's awesome!!

This boat hops right up on plane, and man I'm telling you, I don't think any of this boat is even in the water when we are up and cooking!! The foot hangs down about 3" off the bottom of the boat and Id be totally comfortable running in 4-6" while on plane. I think the 5-6 degree deadrise is perfect for a jet boat. We didnt cavitate one time. I gotta say, Im not missing the tunnel hull one bit.

Here's a video of her:
https://www.youtube.com/watch?v=KGnusXUH7Ow


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 Post subject: Johnson 90/65 Opinions?
PostPosted: 26 Apr 2018, 09:44 
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Joined: 02 Jun 2015, 09:56
Posts: 476
Location: Bedford Indiana
Good to hear you like, I bet with some fine tuning, pump, impeller work you'll be able to squeeze some more out of it speed wise. You could probably go up a little higher with the engine with some intake fins maybe?


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 Post subject: Johnson 90/65 Opinions?
PostPosted: 26 Apr 2018, 13:31 

Joined: 28 Sep 2014, 09:02
Posts: 255
Location: Charlottesville, VA
handyandy wrote:
Good to hear you like, I bet with some fine tuning, pump, impeller work you'll be able to squeeze some more out of it speed wise. You could probably go up a little higher with the engine with some intake fins maybe?


Oh yea! The 65hp impeller is in there now, I need to order the 80hp one.

I may be able to come up a hole with some fins because I didnt cavitate one bit with her. Id like to spend a little time fine tuning her but its flathead season so I may just let her eat for now. Just got a Structure Scan transducer so I can read the shallow bottoms and fine those honey holes!


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 Post subject: Johnson 90/65 Opinions?
PostPosted: 15 May 2018, 10:23 

Joined: 11 Mar 2017, 21:52
Posts: 248
So did any of you fellas try the 90 Johnson on a 16 foot boat? I have one on my pontoon that I'm thinking of taking off and using on my Alumaweld and putting the Yamaha on the pontoon. I'd like some real world feed back on how they draft on the smaller boats and how much weight you can push with it. My boat is 50 inches wide and all welded. Thanks guys.


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 Post subject: Johnson 90/65 Opinions?
PostPosted: 16 May 2018, 17:01 

Joined: 28 Sep 2014, 09:02
Posts: 255
Location: Charlottesville, VA
Never had that big of a motor on a boat that size. The bottom of this boat is 54", and with me and two other guys back there catfishing she still has plenty of freeboard. I have the start battery, 12 gal of fuel, and another passenger back there and she hops right up on plane and rolls out.

We use it for catfishing. I had a bait tank and livewell on the boat with three batteries, 12 gal of fuel and two OTHER guys and she got right up on plane. She's not as fast as I would like (30-32), but man does she push a load. We were skimming through inches of water while on plane, and had the weight set up to drift 4-5" of water when floating. This motor is one of the lightest, if not the lightest 90/115 that Johnson has produced, at 315lbs for the jet. My 4 stroke 60/40 jet weighed in at 267. So for 50 lbs. more I have twice the HP. That's going from a 1L block to a 1.6L block!!

The 60/40 was on the back of my 1648 .125gauge rhino, with tunnel (heavy). That boat had little to no freeboard with that motor. This motor would have swamped her without pods.

I just got the 80hp impeller and it has been polished up and sharpened. Got her installed with my clearances tight and ready to give her a run. Hoping to get 33-34 out of her.


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 Post subject: Johnson 90/65 Opinions?
PostPosted: 16 May 2018, 17:54 

Joined: 11 Mar 2017, 21:52
Posts: 248
My boat is a 16 foot 50 inch wide flat bottom. I don't if know I'd have to add pods if I went with the Johnson 90. I think from what I've read on these motors that if I removed the lower unit and replaced it with the jet unit that it would probably add even more weight. Supposedly my 90 Johnson weighs in at 319 lbs.. The 40 Yamaha I have on there now weighs 196 and the kicker is another 96 pounds. Thats 292 lbs. and I figure it's almost a wash or close to it. I could shift some weight forward also, like the gas tank for one. Sounds like your boat pushes a good load. I was hoping that maybe you'd have run the 90 on yours. Thanks for the reply!


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