Reply To: Champion J4 Sparkplugs for JW, Lightwin, and H Models

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January 22, 2021 at 4:51 pm #228509
aquasonic
Participant

    Thanks Buccaneer. I have seen that page from the service manual. My HD-25 is from a much earlier serial number 570699, and does not have the clean out screw where a small section of brass rod can be inserted to minimize the fuel capacity within the carburetor. One could probably be drilled, and tapped there though.

    Regarding the spark plug model vs. motor temperature, I’m not sure how that relationship works.

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