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Small Engines (Lawn Mowers, etc.)/honda gxv530 engine surges and backfires

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Question
This is third carb on this engine.it is 13years old but not used that
much.mostly for leaf pickup in fall.Engine has new carb,New plugs
New air filter valves st on 4 for intake and 6 for exhaust.runs good
Under load, but surges and backfires when blade disengaged.New carb
Used to fix this problem, but not this time.Use reg grade fuel.
Thanks

Answer
If you remove the air filter and hold you hand over the carb intake throat does the engine performance change?  You will have to move your hand to open and close the air from entering the carb to see if the performance changes.  You are essentially checking to see if the engine is running rich or lean.

It could still be a dirty carb or you could have a warped carb to engine insulator or leaking gasket.

Try the hand trick to see if the engine performance changes and let me know what happens.
Eric

Small Engines (Lawn Mowers, etc.)

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Eric A. Jones

Expertise

Lawnmower Repair . Certified Master Service Technician from B&S. Have 23 years experience on B&S, Lawn Chief, Weed Eater, Echo, Peerless, Wheel Horse, Snapper, Atlas, MTD, McCulloch, Homelite and many other numerous brands. Specialize in electrical repair.

Experience

Born and raised in the midwest. Started tinkering with engines when I was about 14 on my Suzuki RM-80. I began lawn mower repair at a small hardware store. I knew absolutely nothing. I read lots of repair manuals and met an older fellow who taught me many lessons. I continued working on small engines through high school and paid my way through college working on mowers at the same hardware store. Decided to get away from the midwest and mower repair so I joined the Air Force. I repaired air traffic control electronic equipment and ended up in Hawaii where I got a part time job at Small Engine Clinic. I gained a lot of experience from the Small Engine Clinic and had a blast repairing small engines. I then took the Briggs and Stratton Master Service Technician test and earned my MST. I then traveled to Wisconsin where I attended the factory update training seminar and received formal training. Continued working on mowers part time as I completed 20 years of military. Retired from the military on a Friday and continued in the lawn and garden industry the next Monday.

Education/Credentials
MAS Aerospace Operations BA Mathematics AAS Electronic Communications AAS Electronic Technology

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