Small Engines (Lawn Mowers, etc.)/weak spark - tecumseh 8hp


My yardman chipper/shredder won't start. I've replaced the spark plug, SS module (laminations) cleaned and adjusted the magnet gap to .012", verified the "kill" switch wire. same condition very weak spark and no start. HELP!!!!!

This is the second question recently regarding "weak spark"

I've only seen an ignition module with weak spark once.  The best tool to use to determine the ignition module spark is to use an inline spark test with a .166 of an inch air gap.  If you see spark using an inline spark tester then the ignition module is good.

Have you tried priming the engine with brand new gasoline to see if the engine tries to start?  Does the engine have compression?  When was the last time the engine was started?

Let me know.

Small Engines (Lawn Mowers, etc.)

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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

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