The rpm that the PTO is made to run at is 2400. When I get these engine warm, I adjust the rpm to 2400 and leave it there. 3000 is not the usual unless doing some road travel. I was surprised that the engine could not be pushed any further.
The governor cuts the fuel back gradually as the rpm builds. This starts above 2400rpm. My 19 hp is a one liter 2 cylinder my 21hp is a 1.2l 3 cylinder. Pretty similar to yours.
I doubt if adjusting a single screw on the fuel pump is anything that you should try without much investigation.
Your best option in my opinion is to not push your engine harder but consider taller gearing, taller tires. Something to make the engine run about 2400.
Quote:
Originally Posted by DieselDrewski
I'm sure that it isn't best idea. It is strictly to compensate for gearing that isn't quite tall enough.
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