Topic: 1935 Johnson Aero built 300 fuel mixture – Antique Outboard Motor Club,Inc

This topic has 31 replies, 10 voices, and was last updated 8 years ago by Tubs.

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May 6, 2017 at 9:10 pm #6943
hutch1935
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Hi, Hutch here in Minnesota I just acquired a Johnson 300 I believe it’s 3.7 horse and I’m trying to find out what the proper fuel mixture is for it can’t seem to find anywhere online also does anyone know what the correct spark plugs are for this unit as well as does it use gear Molly in the lower end because it looks like it’s got a big grease fitting down there on the top of the cavitation plate. thanks for any help. Hutch
May 6, 2017 at 9:16 pm #57209
chris-p
Participant
I use John Deere corn head grease, or Lubriplate 105 in the gearcase.

The 300 uses Champion J8J plugs gapped to 030.

030 point gap

1/2 pint per gallon of fuel.
May 6, 2017 at 9:19 pm #57210
chris-p
Participant
Also, it could be a 1935 or a 1936.

If the serial number is between 219,372 and 232,156 its a 1935
If the serial number is between 232,157 and 252,675 its a 1936
May 6, 2017 at 9:31 pm #57213
kees
Participant
International Member
.
for your info

.
May 6, 2017 at 10:12 pm #57220
hotrod
Participant
Memory tells me that the big grease fitting is not a grease fitting. It is a clip for an accessory trolling plate.
May 6, 2017 at 10:21 pm #57223
Mumbles
Participant
Exactly.

Attachments:
May 7, 2017 at 2:29 am #57233
hutch1935
Participant
Thanks for all the information. Are there any places to download the manual free ?
May 7, 2017 at 2:38 am #57234
hutch1935
Participant
By the looks of it ,it’s a 35

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May 7, 2017 at 7:26 am #57236
Mumbles
Participant
Here’s a free parts manual.

Attachments:

Johnson 300 Parts.PDF
May 7, 2017 at 9:24 pm #57258
hutch1935
Participant
Well she’s a runner. Fired up nice and settles into a smooth purr. Thanks again for all the help!
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