1968 Johnson 3hp

maineiac5586

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Hi, I picked this up today, motor pulls over but starter rewind is slow to wind back in, anybody know how to make the rope go back in faster? Motor is a 3 hp twin cylinder , came with all original owner's manual and other paperwork from johnson when new. Looks like it has what is called the weedless lower unit. Anybody know what this thing may be worth. Is it desirable? thanks
 

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1946Zephyr

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Re: 1968 Johnson 3hp

Nice little motor. It looks almost as good as new. I have a 4 horse motor 2 years newer than that. Spray the workings of the rewind really good with WD-40 to get it loosened up, then apply some light weight oil to it after that. Reguardless of what anyone tells you, run that motor at 24:1 and no leaner and it'll last for years. Some will say 50:1 but that's hogwash. Yes, that is a favorite among the iboats members.
 

maineiac5586

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Re: 1968 Johnson 3hp

Oh, one thing I thought of, the handle on the port side that controls speed is stuck in the position you see, any ideas, I don't want to force the lever. ALso, how do you shift this thing from stop to forward? I tried pulling the starter rope and it seems like it tries to turn the prop, help me understand please thanks
 

1946Zephyr

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Re: 1968 Johnson 3hp

Yes, that is the throttle control. Spray the heck out of it with WD-40 to loosen it up. You may have to remove it entirely and clean it up. Then put it back together with fresh grease.

There is no shifter on that motor. It is a direct drive. So if you ever use it, make sure your boat is pointed in the direction you want to go, before you start it.
 

kfa4303

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Sep 17, 2010
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Re: 1968 Johnson 3hp

That's right. If you want to go in "Reverse" you have to rotate the motor 180 degrees. The lever on the side, where the shifter is on most larger horse power models, is actually the motor's throttle. Here are some handy links to help you keep here running.

http://www.outboard-boat-motor-repa...on 3 HP 1952-1967 Ignition System Tune-up.htm

http://forums.iboats.com/showthread.php?t=167352

http://forums.iboats.com/showthread.php?t=158086

http://www.outboard-boat-motor-repa...hnson 5.5 HP 1954-1964 Carburetor Tune-UP.htm

http://www.duckworksmagazine.com/07/columns/max/index1.htm
 

maineiac5586

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Feb 14, 2009
Messages
770
Re: 1968 Johnson 3hp

I got the arm to move, seems like something is sticking, hard to move (it pivots a plate under the flywheel) the more I moved the lever bak and forth the easier it got to move, let it sit overnight and today it is stiffer again, can still move it though.I guess this plate is part of the timing advance/throttle arm, can't get to it because of the flywheel hiding it. Any ideas what may be causing this? Maybe hardened grease? any way to free this up without pulling flywheel? On a good note, I got the recoil freed up although it squeals when pulling the rope out and retracting like it is dry but I did put a geneous amount of lube on it. Compression tested 95 psi per cylinder and both cylinders show strong spark. Looks like it is almost ready to fire up. Let me know any ideas to the above throttle lever issue and any way to quiet down that recoil, thanks
 

1946Zephyr

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Re: 1968 Johnson 3hp

Wow, 95 per cylinder is awesome. I would pull the flywheel off and remove the mag plate. Clean up the rings under it and apply some fresh new grease. While you're at it, I would clean and relube the throttle handle.
 

maineiac5586

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Re: 1968 Johnson 3hp

Do you mind walking me through the steps to do this? Am I going to lose any settings by digging into this? my other option is to let the next buyer do it, I don't want to disturb too much, looks like this motor is a real time capsule.
 

1946Zephyr

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Re: 1968 Johnson 3hp

Oh shoot, i wouldn't part with that motor if I was you.

What you do, is remove the flywheel Then remove the phillips screws that secure the mag plate. Also, detach the linkage from the throttle handle. There's really not much to it. On the mag plate, You'll see one screw towards the rear of each of the coils, and one down by each of the point sets. Four phillips screws around the center typically hold the mag plate on. Once you loosen those four screws and detach the throttle linkage, you should be able to lift it right off. Once that is done, you'll see a brass ring mounted on the powerhead and an aluminum ring under it. You'll want to remove both of those and clean them up thoroughly of the old grease. Apply new grease and put them back on the powerhead. Then reference the four screws in the mag plate, with the holes in the aluminum ring and attach the mag plate back on the motor. Once you pull the flywheel off the motor, inspect the coils and make sure there are no cracks in them. If there is, then they'll need to be replaced.
 

kbait

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Nov 13, 2007
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2,469
Re: 1968 Johnson 3hp

You may as well remove the points and file their 'faces' up shiny/new and reset to .020" since you're in there anyway. Don't use sandpaper, as the grit can stick to 'em and cause pitting. Good luck!
 

maineiac5586

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Re: 1968 Johnson 3hp

Started it up tonight, I can't believe no fuel leaks when I pressurized the system, started on third pull or so, idled perfectly, revved right up. smooth as can be (what a little sewing machine!!!!) It is going to be hard to part with this one, I think I will keep it, (only paid 35.00 for it!) Got all the original manuals for it to, he threw them in. this motor had been sitting for many, many years and idles and runs better than most newer motors!!!!
 

1946Zephyr

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Re: 1968 Johnson 3hp

See? I tyold you, you wouldn't want to part with it. LOL I have a 1970 4hp Lightwin (basically a later version of yours there) that I rebuilt for a guy. It's a great runner. He hasn't paid me after three years so I can actually claim it now.
 

maineiac5586

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Feb 14, 2009
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Re: 1968 Johnson 3hp

You were right, it is such a cool piece. I had no idea there were outboards that were direct drive like this. Think I will take it to my parent's cabin on the lake in Maine and enjoy it. Thanks again
 

1946Zephyr

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Re: 1968 Johnson 3hp

Yea, that'll make a nice toy to take up to the cabin. They're nice and light and easy to pack around and easy to put away for the winter. The 4hp I have, will probably become a kicker for my 15 1/2' Lone Star.
 
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