Question about Tecumseh Lawn Boy Push Mowers Insight Silver Powered Series - Sens - A - Speed Walk Behind Mower - 10685

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I have a Lawn Boy 10685. Changed the blade and went to start the mower and the pull cord will not pull. I tried spinning the blade by hand with no luck. I took the starter apart and it spins fine. I check the brake cord and it looks fine. Any other suggestions?

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Remove the spark plug and try pulling the starter again. You may have a fuel leakage into the cylinder and it has caused a hydraulic lock. Check/change the needle and seat in the carb as this leaking is the usual cause if this type of problem. Good luck and please rate this solution.

Posted on May 22, 2011


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I changed oil, blade, spark plug,air filter on tecumseh lawn boy 10685 it will not start!!! gas tank was emptied, per instructions. before changes, it started right up on first pull before...


Make sure the blade and shaft can easily be moved by hand. First, remove the spark plug wire from the plug. Reach under the mower and see if the blade will turn or if something is stuck between the blade and the mower. Also remember that you have to hold the safety bar when you are starting the mower or the engine won't turn. It is possible that the cable from the safety bar to the engine brake has come loose. Follow the cable from the safety bar to the engine and make sure it is working.Also check whether the line from the gas tank to the engine is crimped?

Also check this link to troubleshoot your problem:-

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When trying to start, it seems that the engine fires early and yanks the cord right out of my hand.

You probably have a bent flywheel key. The timing is off and the engine.

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What locks in the left and right torsion springs

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My Lawn Boy Pull Start is Locked Up... If I take the Pull Start off, it is fine. How do you know if it is the motor. I am able to get the blades to turn by hand. They do not turn easy like a windmill, but...

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Pull string locked up

check oil , if you didn't have sufficiant oil you may have blown the motor up . try turning mower up and turnning blade by hand to see if motor is froze. if so you can kiss this mower goodby ,or at least the motor. sorry .by the way maybe you would want to check the oil in your car before you blow it up too

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make sure you can turn the blade by hand, make sure grass isn't stopping the blade after that make sure the break cable isn't bad, sometime's the cable don't disengage the break from the flywheel. Hope this works.

May 23, 2009 | Tecumseh Lawn Boy Push Mowers Insight...

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