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Small Engines (Lawn Mowers, etc.)/1993 Honda Harmony 215 low power

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Question
I bought a Honda HRM215SXA that had been stored for a while. I fueled it up, and it started on the first pull. So I changed the oil and spark plug, checked the air filter, and ran it for a bit. Everything seems to work perfectly, except it seems to have low power - stalls easily under any load. When I engage the blade, it almost stalls. If I engage the blade in contact with grass, it definitely stalls. If I run it into high grass, it stalls.

I haven't rebuilt the carburetor, as I'm not seeing any clear evidence of mixture problems. It cold starts fine with the choke, hot starts fine without the choke. No surging. Throttle response is normal, and engine sound is smooth. No smoking.

What are my next steps to figure out why this thing is so weak? Thanks!

Answer
There are two circuits in your carburetor, low speed for idle and high speed for power.

Most of the time the idle circuit feeds fuel to the engine.  When you mow or load the engine, the governor opens the carburetor butterfly and the high speed circuit becomes active and feeds additional fuel to the engine.

The high speed circuit may still be clogged or the governor may not be working properly or adjusted correctly.

When the engine runs at full speed, do you know the engine's RPM?  You need a tachometer to verify the engines top-no-load speed to verify the engine RPM is correct.

Does the engine sound like it is running fast enough?  It can be difficult to tell on some Honda's as they run really quiet.

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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