Topic: 1936 Johnson A-80 4.5 hp power head HELP! – Page 2

This topic has 22 replies, 5 voices, and was last updated 6 years, 6 months ago by squierka39.

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October 29, 2017 at 12:42 pm #66757
jerry-ahrens
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US Member
I’ts nice to see someone working on the early alternate firing motors. It seems like I never see those running at a meet. I heard a story once, that the Johnson brothers got the idea to build the alternate firing powerhead, after observing how smooth the V-45 motor ran with the compression release activated. Pretty interesting..
Those engines were really a ”milestone” motor for the outboard industry, when compared to the old opposed firing models.
October 29, 2017 at 4:28 pm #66763
Buccaneer
Participant
US Member
Interesting side story Jerry!
I hope mines is one of those "good runners".
Got the crankcase and cylinder "blasted"
this morning. Back to the garage!

Prepare to be boarded!
October 29, 2017 at 7:03 pm #66769
pm-t2
Participant
Canada Member - 2 Years
alternate firing twin running at a one-man wet meet in Lake St. Clair. This was a good running one-pull motor that has since moved on to somebody elses collection.

I just got another A-70, this one needs help to run, low compression and probably needs centre main work too. To be honest – The rewind starter was the main attraction

PM T2
October 29, 2017 at 8:29 pm #66773
squierka39
Participant
US Member
That’s pretty cool, missed out on a ree-coil K a few years ago. I think they only made that for a few short years, Maybe on the 65 and 70 models?
October 29, 2017 at 8:41 pm #66774
squierka39
Participant
US Member
Here is my KA39, unrestored. Runs great.
October 29, 2017 at 10:40 pm #66777
Buccaneer
Participant
US Member
Mr. KA-39, Nice looking motor! Wish my fuel tank
looked like yours. I found the timing marks you
mention. Thanks for mentioning them. With the
plug holes 90 degrees to the cylinder, I couldn’t
use my TDC gauge and buzz box method anyway.
Cylinder painted up a while ago, and made
the gasket for it. The original was only .010
thick. Best I could come up with was some
heavy kraft / masking paper at .008 thick.
My thinnest gasket material is .015.
Will coat it with some grease and hope for the
best. 😉

Attachments:

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October 30, 2017 at 1:12 am #66784
squierka39
Participant
US Member
KS-15 that I had just finished and my KA-39 displayed in the rain. Notice the KS has a painted tank, correct for that year and even with dents it’s not to bad.
October 30, 2017 at 1:28 am #66785
Buccaneer
Participant
US Member
I have a 1932 K-50, 1940 KA-10,
and a 1941-42 KS-15, waiting to be worked
on. I’ll probably be asking for advise when
the time comes!
Yours are "Sweet". Will have to search YouTube and
see what the "sound like".

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October 30, 2017 at 2:25 am #66788
pm-t2
Participant
Canada Member - 2 Years
quote SquierKA39:

That’s pretty cool, missed out on a ree-coil K a few years ago. I think they only made that for a few short years, Maybe on the 65 and 70 models?

nope, have also seen them on earlier motors, like this S-45

PM T2
October 30, 2017 at 1:09 pm #66796
Buccaneer
Participant
US Member
Did the accessory "Re-Coil" starter include a different
starter / rope plate with dogs, or does it engage the
flywheel nut, or ???

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