1973 johnson 20hp problems

ctrevis7

Seaman
Joined
Aug 13, 2010
Messages
53
For some reason my boat feels and sounds like its slipping, so i took it to the mechanic and he said nothing was wrong with it, any suggestions on what it could be?

Its my first boat so im kinda worried :(

I have a video of it and can email what its doing if someone would help i would greatly apreciate it.

Thanks and God Bless
 

steelespike

Supreme Mariner
Joined
Apr 26, 2002
Messages
19,069
Re: 1973 johnson 20hp problems

We need details describe exactly what it does.Does the boat plane?What size and type of boat What weight.About how fast does it go?Is this a new developement?
Is the antivent plate(just above the prop) about even with the bottom of the boat?
 

soundchaser

Petty Officer 2nd Class
Joined
Dec 8, 2009
Messages
176
Re: 1973 johnson 20hp problems

The prop is probably spinning on the hub, take the prop to your shop and have the rubber hub replaced.
 

ctrevis7

Seaman
Joined
Aug 13, 2010
Messages
53
Re: 1973 johnson 20hp problems

its not the hub i know, i took it to the mechanic and he said it wasnt the hub was fine.

Whats its doing is ill start off slow and as i get to about half speed it gets very loud and doesnt get any faster, and the times i get to full speed it feels like it slips and slows down the catches the jumpes back to full speed and repeats. The boat is a duracraft 14/36 semi v and it does get on plane, im not real sure of the speed but if i was to gues i would say between 20-25mph at full speed,

steelspike i have a video of what its doing from yesterday out on the river is there any way i could email it to you so you could see?


Thanks
 

lindy46

Captain
Joined
Nov 27, 2008
Messages
3,886
Re: 1973 johnson 20hp problems

Shift linkage worn/out of adjustment? Clutch dog/forward gear worn? Two possibilities.
 

steelespike

Supreme Mariner
Joined
Apr 26, 2002
Messages
19,069
Re: 1973 johnson 20hp problems

probably better if you put it on something like utube and post it here.
 

RadarRick

Petty Officer 2nd Class
Joined
Jun 30, 2010
Messages
189
Re: 1973 johnson 20hp problems

That video link is password protected. Could you post on YouTube or on open site?
 

kbait

Commander
Joined
Nov 13, 2007
Messages
2,476
Re: 1973 johnson 20hp problems

Does it 'clunk' and jar the boat when it occurs? Or is it like pushing a clutch in and the motor races and the boat slows..

If it's the latter, my money's on a spun prop hub. If the former, gears/clutchdog/linkage.. Something. (I assume you checked the drive pin)
 
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