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    Yamaha 40cv 2 stroke 3 cyl 2006: rpm and alternator output frequency

    Hi, I need to calibrate a tachometer which has a potentiometer to adjust the rpm scale, so I thought to use a frequency meter connected in parallel to it... but which is the correspondence between RPM and Hz? Thanks a lot.
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    suzuki dt25 3 cyl, voltage check on throttle valve sensor

    Hello, Is there anyone familiar with the outboard above? I have it mounted on my boat and it's not working properly: below 4000 rpm it seems to misfiring at one cylinder causing rough operation and vibration; I checked a lot of components including throttle valve sensor that seems to be ok, but...
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