I have a 18 hp Kohler Command. I noticed it has the same bore and stroke, and compression ratio as the Command 20 and 22 engines. This leads me to believe that they are the same engines. Where does Kohler get the extra ponies on the 20 and 22 models? Is it with the carb? I doubt it's in the cam. Somebody mentioned something about moving the trottle plate on a small engine to get more hp. Is this all that is involved in bumping the output on my 18? And when they say the throttle plate are they referring to the "butterfly valve"? If so, does the throttle plate have a limiting screw or something to limit it from opening all the way at full throttle? I know it's gotta be something simple. But I don't know what the differences are between the three engines. And I'd like to make my Command 18 into a Command 22. All three engines make their peak power at the same RPM. So it can't be govenor related. Displacement is the same, plus they all have similar idle characteristics so it's gotta be in the carb. Please help. I'm tempted to buy the new Honda 24 hp, but first I want to try bumping the power up on the engine I already have.