That useally true in majorty of diesel generators.,,
to OP .,,
did you verify the engine speed by the X of RPM ? if you are in 50 Hz Area the generator should be in 1500 or 3000 rpm depending on the poles on the generators 1500 should be correct for 4 pole verison while 2 pole you should be spinning at 3000 rpm.
But if you are on 60 HZ you should be at 1800 or 3600 RPM.
you should get the frequecy meter to read the numbers of HZ to get the correct speed then adjust the voltage to correct number.
It has options, 50HZ or 60HZ. But i didnt measure if its really 50hz or 1500RPM. Im really confused with the Japan generator, because they use 110v and on this generator doesnt have 220v toggle.
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