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Wayne, Engine Rebuilder
Category: Small Engine
Satisfied Customers: 9444
Experience:  many years on egine rebuilding, lawn mower,roto tiller,Truck,and small engines
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I have a JD Z425 mower with a /S 44L777 V-Twin engine. Engine

Customer Question

I have a JD Z425 mower with a B/S 44L777 V-Twin engine. Engine will start but has no power. Engage PTO, engines dies down to low RPM. Engine backfires through carb and blueish smoke from exhaust. Flywheel key-good, removed corrosion from flywheel and coils, set, One plug has high carbon build up (short run time), the other smells of fuel, but clean.
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Submitted: 1 year ago.
Category: Small Engine
Expert:  Wayne replied 1 year ago.
Hi I'm Wayne I will help you with this what you are describing is a very common issue on this engine , remove the valve covers and adjust the valves also look to see if a push rod is off or bent valve clearance is .004-.005, booth valves engine cold I hope this helped you Hi If this helped you Please remember to rate my answer 3 or more starsIf more info is needed, use the reply buttonNOT THE POOR/BAD SERVICE