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should be an internal govenor on a plant unit like that
... there is a thicker than normal metal rod running off the carby to the motor and that is where you adjust the govenor
cant find good instruction how that governor is adjusted ..if adjusted the wrong way it will rev out may even throw a piston
then check carby idle adjustment should hunt (rev up and down only slightly )as load changes you tube 11hp Honda GX340 cold start https://www.youtube.com/watch?v=i3_v68__X5o
the chart shows figures of 10.7 hp-8.0kw with a torque of 19.5 ft/lbs- 26.4nm at 2500rpms ( max net torque)
the chart shows gx390 is 11.7hp (8.7kw) but the torque is the same as the gx340
you can get these figures from world. honda com or by going google and typing in--torque range of honda gx 340 motor at max rpms
10 hp engines running at 2500 rpms will be good for gensets of 5kw continuous out put as most makes run that size engine
Excessive fuel entering the inlet manifold, carby needle and seat not shutting of fuel flow , remove and clean fit new gaskets and needle and seat if worn.
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