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    40HR / 6H4 Charging System / Battery sizing

    Hello everyone, I have an Yamaha 40HP 3 cylinder two stroke (6h4) and measured the voltage on the rectifier output with a scope. Without load it looked like a rectified AC voltage up two 50V, with a motorcycle battery connected it was between 13V at idle and 17V at 4000rpm. The voltage is...
  2. S

    Yamaha 40 HR / 6H4 exhaust alignment

    Hello, as I was replacing the impeller on my Yamaha 40 HR I noticed that the main exhaust is not aligned with the hole on the bottom of the shaft: https://www.bilder-upload.eu/bild-0fb403-1591829143.jpg.html (Please let me know if that link works, I had some issues inserting the picture). Has...
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