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Old 06-20-2012, 10:40 AM   #62 (permalink)
DieselDrewski
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Quote:
Originally Posted by Varn View Post
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.
The single screw is an external hard stop on the throttle lever, and I'm pretty sure its meant to set max RPM within the governed range. I'll check the service manual to be sure, though. The owner's manual from the donor lawnmower states the no-load high idle to be 3100-3200 RPM. I'm not sure what accounts for the difference between your engines and mine.

I guess maybe the tachometer circuit should move up on my priority list. How many pulses per RPM is the tach going to be looking for on the tracker gas 4 cyl? Is it one or two?
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