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Small Engines (Lawn Mowers, etc.)/Honda GVC-160 lawnmower knocking sound

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Question
I have owned this fantastic mower for about 18 months.  Engine still runs strong but I hear a knocking sound from the engine.  Started 6 months ago, getting slowly worse every time I mow the lawn.  Already changed the oil and it was very clean the first time I changed it.  No pieces of metal either, but it is hard to say what is at the bottom of the sump.  Last time I checked it, still clean.  I have about 30 hours of operation on the engine.  Just cutting short grass.

Answer
Are you sure the noise is not coming from under the deck.  A loose blade, cracked blade adapter?  What oil brand and weight are you using?  Does the engine burn any oil?  Is the spark plug tip black or a light brown color?

Do you remove the oil drain plug to drain the oil?

Let me know.
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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