It's that time of year again and the lawn tractor wasn't running so well. Decided to rebuild the carb and fuel pump.

Motor is a 14hp Tecumseh OH140 single cylinder cast iron block. Carb is a walbro LMH, tractor is an 1984 Bolens XL medium frame, low hours in very clean condition.

I rebuilt the carb and fuel pump. Cleaned the carb, adjusted float to spec, replaced usual rebuild kit stuff. Adjusted manual choke and throttle linkage. No binding and all appears to be adjusted properly. Tractor idles well and throttles up smoothly.

When I move the throttle to full open before starting the tractor, the throttle shutter is wide open. After I start the motor, and lever to full throttle, the butterfly closes as if in low idle position, but it seems to be at full RPM as it should be. . Shouldn't the throttle butterfly be wide open at full throttle with the motor running? I don't understand how the motor can throttle up fine and yet the shutter is closed.

What am I missing here? Is this normal? I'm confused as the tractor is running fine.

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