Small Engines (Lawn Mowers, etc.)/MTD craftsman lawn tractor


I received a Craftsman/MTD lawn tractor, model # 13A0672G129 with a Tecumseh 15.5 engine.  It came from an estate sale so I have no history of it.  The engine starts fine, but when you try to increase throttle it loads up and coughs black smoke from the exhaust.  The choke is on when I start it, and when it warms up I pull it back off.  The butterfly inside the air intake is open, and it only revs when I stick a leaf blower into the air intake- essentially turbo charging the engine.  The old fuel was drained, and new gas added.  What can I do to fix the issue?  Serial number is 1D262B80082.  thanks.

Good troubleshooting technique...adding air which is leaning the fuel mixture.

You need to remove, dis-assemble and clean the carb with compressed air from an air compressor and spray can carb cleaner as something is either blocked or dirty inside the carb.

It is possible the float is leaking and allowing to much gas to enter the carb.  Either way you still have to remove and clean the carb even to inspect the float.


Small Engines (Lawn Mowers, etc.)

All Answers

Answers by Expert:

Ask Experts


Eric A. Jones


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.


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.

MAS Aerospace Operations BA Mathematics AAS Electronic Communications AAS Electronic Technology

©2017 All rights reserved.