Newby here 1972 70hp help

Joined
May 16, 2007
Messages
6
Hey everyone....im new here. Wish I had something to offer before I start asking questions but I dont being that im a newb lol. Sorry, I hope you help still...

Anyway...

Quick history I have had several boats, bass boats, center consoles, dual consoles...blah blah...so im 'okay' and I say that loosely with outboards. I race and build quads so im good with 2 and 4 stroke cycle motors....with that being said. I recently sold my 23' with 200hp Merc (that thing hauled) and Im looking at a small 16 boat becuase my 3 sons are going thru 'fishing from boat' withdraw lol....This boat im eyeing up has a 72 Johnson 70hp on it. The owner tells me the last time it was ran 4+ years back it smoked the day they put it away and didnt go to use it till the next season at which point the motor wouldnt turn over. So it then sat till now. Now I dont think it siezed from use....Im thinking maybe I can dump some seafoam or WD-40 in the cylinders and see if I can turn the crank ver manually.... The motor not running is not a deal breaker becuase I plan to use an electric motor alot but it sure would be nice to fire that little guy up and rip up and down the river.

The boat btw is a 72 starcraft 16' dc and its all aluminum. I plan to gut it...and put a big casting deck from front to back with new carpet and use it as a salt/freash hybrid.

So what do you gurus think on the motor situation? I have no quams bout ripping it down...im jus thinkin maybe I can get her turnin over and look see the compression.

Thanks guys!!!
 
Last edited by a moderator:

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: Newby here 1972 70hp help

Howdy, OnB.

Welcome to iboats. :)

Gonna put this where you should have. . . the yammy forum.
 
Joined
May 16, 2007
Messages
6
Re: Newby here 1972 70hp help

Oi..im so stupid...thats the quad builder in me when I said Yammy.... its a Johnson. DOH
 

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: Newby here 1972 70hp help

i'd use marvel mystery oil, not wd40.
 
Joined
May 16, 2007
Messages
6
Re: Newby here 1972 70hp help

Marvel mystery oil? Never heard of that. I went to see it last night..I bought the boat. Motor doesnt appear to be frozen as I was able to turn the flywheel by hand. It doesnt seem to have alot of compression though...may be the rings all stuck in. Im thinking something to release those rings, then compression test....then get her running and decarb.....It says 70hp Johnson Looper Ignition. Does that mean anything? Anyone know where I can grab a manual online.. The owner tells me he thinks its a 1975.

Thanks guys....
 
Top