Setting Engine Speed - Honda and WT40X Owner's Manual

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OPERATION
6. If the choke lever was moved to the CLOSED position to start the
engine, gradually move it to the OPEN position as the engine warms
up.
SETTING ENGINE SPEED
After starting the engine, move the throttle lever to the FAST position
for self-priming, and check pump output.
Pump output is controlled by adjusting engine speed. Moving the
throttle lever in the FAST direction will increase pump output, and
moving the throttle lever in the SLOW direction will decrease pump
output.
THROTTLE LEVER ,
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