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  1. #1
    Join Date
    Jan 2009
    Location
    Murrells Inlet
    Posts
    2,302

    Default Tach help, Low Idle Readings

    Have a 3cyl 25hp that I picked up, installed 1 tach, readings at idle are 350-400rpm. I didn't think the tach was working correctly so I bought a different brand with a ground and I am getting the same readings.

    Attached to the 3rd plug, 5wraps, settings are 3P1R.

    Motor has been worked on some, MD40 carbs, reeds, shaved heads.
    Does this sound low or are both the tach reading correct?

    For reference, boat runs great at flounder trolling speed but when I ran it up, says motor only is turning 1710 but running about 30mph. This also doesn't seem correct to me.

    I got the tach to fine tune prop. It's a Yamaha black stainless 13-p.
    Last edited by scdiver; 07-12-2018 at 09:07 AM.

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