Re: Johnson HD-25 2-1/2 hp parts

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February 23, 2017 at 6:15 pm #53478
aquasonic
Participant

    I can’t think of any mechanical changes at all through the production run. The only thing that comes to mind as far as change is the decals which changed in 1949. 1946-1948 decals are identical.

    75 PSI is considered very good for an H model. I have one that tops 80 PSI, but 70-75 is much more common. These rotary valve motors are very unforgiving to low compression.

    As far as which model, TD or HD is a better seller, I have no idea. It seems as though I see more TD models for sale, so it may just be availability.

    Improvise-Adapt-Overcome