KA 37 spark plugs

[Boonie]

I would like to change the spark plugs in my KA 37. They are a two part plug assembly. What do i need to get to replace them. The threaded holes in the cylinders are to large for conventional plugs.

[eltoquad]

Spark plugs for that motor are very available. You just need to convert the number on your old plug to the replacement number. I don’i have that info available with me right now. Just post the old plug number here and someone will give the replacement plug number.

[Boonie]

Thanks eltoquad. Plugs are Champion R-7.

[David Bartlett]

I have used Champion D-9, or NGK A-6 plugs with good results. I have a couple motors with the 2 piece plugs in them and they run just fine. I would rather have an old plug in an old motor.

 

David Bartlett
Pine Tree Boating Club Chapter

"I don't fully understand everything I know!"

[MIKE SIMS]

I have a Champion Spark Plug Chart for 1965 showing replacement for R-7 to be a K-61R

[Tubs]

Your motor needs a 18mm plug with about 1/2″ reach. Examples would be Champion D-16 & D-17, AC-86. There are other brands as well.    

 

A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.

[Boonie]

Went to the local NAPA store and landed on NGK AB-7. Will give them a try.

[joecb]

Just a note on the NGK plug coding system … unlike Champion and many other brands the heat code ( last digit) is goes opposite…. the larger the number the colder the plug.

I have been having good luck with NGK plugs, I like them

Joe B

[Author]

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