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Small Engines (Lawn Mowers, etc.)/Troy-Bilt TB475SS won't start


Hi Eric,
I have the above mentioned trimmer, TB475SS 4 cycle.
It refuses to start.
Replaced carb, cleaned or replaced filters and exhaust screen,
Replaced the plug, changed the oil, checked compression, reading of 60 PSI. MTD tech says that's normal.
Checked valve clearance, both at .004.

I did find oil in the combustion chamber.
I think someone over filled the crank case.
Checked spark, and it does get fire.
Checked the flywheel for a broken key, it's fine too.
All appears to be good.

Still it won't even attempt to start even with gas or starting fluid either in the plug hole or through the carb.
Not even a pop or sputter.

I'd appreciate any ideas.


I would try another brand new spark plug...I have had new plugs out of the box not work.

How old is the fuel?  Will the fuel burn if you try to light it with a lighter?  I use a screwdriver, dip the screwdriver tip in the fuel, go out side and try to light it.  I have found gas that would not even burn when lit with a lighter.


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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