Forum Discussion

sullivanclan's avatar
sullivanclan
Explorer
May 22, 2016

Onan 4000 Generator Model KY - Which Spark Plug Replacement?

I've looked in the manual, I have looked on the internet, and it is just not clear what Onan spark plug number is the correct replacement for my Model number 4KYFA26100K Spec:K, unit. Suggestions? ...
Class C
pnichols's avatar
pnichols
Explorer II
May 23, 2016
For several years now I've used an E3 spark plug - Part No. E3.46 - in our Class C's Onan 4000 generator. This E3 spark plug is a direct replacement for the Champion RN14YC spark plug that came in it:

http://e3sparkplugs.com/

The Onan always starts right up, runs with a very smooth non-labored sound, and is supposedly using a little less fuel than with a Champion spark plug.

I also use an E3 spark plug in the little Honda portable generator that we carry along in our Class C.

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