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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 12592
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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Engine starts and idles fine . After its warm and in high throttle

Customer Question

Engine starts and idles fine . After its warm and in high throttle it starts to pulsate up and down. With blades engaged and mowing its even worse.
Submitted: 1 year ago.
Category: Small Engine
Customer: replied 1 year ago.
Just thinking its carb or coil related.
Expert:  Curtis B. replied 1 year ago.
Welcome to JUST ANSWER small engines, let me try to help you. Kohler twin engine? Run a cylinder test. Loosen the spark plug wires, and with engine idling, remove one spark plug wire at a time. If engine dies when one is removed, the opposite cylinder is not firing. Check it for spark and compression.
Customer: replied 1 year ago.
Both cylinders are foreign.
Customer: replied 1 year ago.
Both cylinders are fireing
Expert:  Curtis B. replied 1 year ago.
You ran cylinder test?
Expert:  Curtis B. replied 1 year ago.
Does engine have good power?
Expert:  Curtis B. replied 1 year ago.
If cylinders are equal, then check the fuel supply
Customer: replied 1 year ago.
Both cylinders ran one at a time.
Expert:  Curtis B. replied 1 year ago.
OK, has fuel filter been replaced? Do you get good fuel flow to the carburetor? 1/4 cup in 15 seconds? If fuel is adequate, then the governor linkage may be binding. What is the engine model number? I will find service manual, showing governor adjustments.