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About Eric A. Jones
Expertise
Lawnmower Repair . Certified Master Service Technician from B&S. Have 13 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. I received a scholarship from the Air Force and am currently pursuing another degree.
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You are here: Experts > Home/Garden > Home Appliances > Small Engines (Lawn Mowers, etc.) > Starter Motor will not spin engine fast enough to start
Expert: Eric A. Jones - 10/28/2009
Question
Briggs&Stratton 14.5 HP I/C Quiet 42" Cut
Model# 287707-1224-E1
This is installed on a MTD Yard Machine Model 13AM675G062
I've searched both the MTD and B&S website but can't find any good troubleshooting tips. I suspect the starter motor may not be functioning correctly but I'm not sure how to test it.
The air filter and oil are clean. Spark Plug and Battery are new.
Starting Condition: Clutch Brake pedal depressed,Speed Control in the Park/Brake position, Shift in Neutral, Lift Lever fully up and I'm Sitting on the Seat.
Engine will only rotate something less than 360 Degrees and then stop. In the start ignition switch position; I can't get it to continue to rotate to start. If it rotated at sufficient speed that it should start then I could check elsewhere. I'm looking for some guidance how I could test out the starter motor to make sure it is working correctly. Is it receiving the correct voltage at it's terminal? How can I trace the voltage from the battery to the starter motor while it's cranking and what should I see along the way. If I can prove it is the starter motor then I can take a look inside to see if it's the spring or brushes etc. If it can't be repaired then at least I'll know what I need to replace. I would appreciate any other troubleshooting tips you could offer and I thank you in advance for your help.
Best regards, Anthony
Answer
The best method to verify starter condition is a current draw test. You will need a DC shunt to check the current draw.
http://www.youtube.com/watch?v=65EiiE4NoDI
I rarely find bad starter. Mainly poor electrical connections. Have you disconnected the battery and cleaned the battery cable ends and battery terminal posts with a wirebrush?
Will the starter turn the engine with the spark plug removed?
How old is the engine? When did the problem start? Has the mower sat for a while? Is there any compression issues? Too much compression?
Let me know.
Eric
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