Evinrude Sportsman 4091 spark plug

[Mike M]

I recently picked up a Evinrude 1935 Sportsman model #4091 1.5 hp the plug that it had was a firestone M-80
Is there anyone out there that could tell me what plug to replace it with.. any help would be appreciated.. thanks

[Buccaneer]

Chart shows it takes a Champion J1-15
No idea what the modern equivalent of that may
be, but maybe Googling may turn up something!

Prepare to be boarded!

[Mike M]

Thanks!! Was able to talk to the guys at champion.. it was actually a JI-15 original plug # the modern day equivalent is a champion D14
Thanks for all your help!
Do you have any idea how the primer pump works on these gas tanks floating Reed valve?

[Buccaneer]

Glad you found the J1-15 replacement data. I filed that away in my notes!
No idea on the reed valves. Hopefully Garry Spencer might be able to
enlighten you.
I did find this photo though, probably from Garry.

Prepare to be boarded!

[Mike M]

Thank you
How can I reach Gary Spencer

[Buccaneer]

Usually he’s pretty active on this site, but haven’t noticed any post
recently. Hopefully all is okay.

You could PM him from this site,
or try the contacting via email as the Special Interest Group leader
for Evinrude, by typing his name in the search box on the top
of the main page.

or try him on Facebook…….
https://www.facebook.com/ChapsBoy

Prepare to be boarded!

[Author]

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