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Craftsman Lawn mowermodel #917378381

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Lawn Mower, no spark

I have a Craftsman Mower: 917.378381 S/N 031403M 010225; Briggs & Stratton Engine: 123K05-0275-E1. The mower won't start. I pulled the plug, tied the interlock handle in the "run" position, and u...

Posted April 30, 2012


Anna T, April 30, 2012

when all else fails then there is managemylife.com to the rescue. i am providing a few links with similar issues on tractors that may be helpful while an expert answers your specific question.

Jim, April 30, 2012

adding: i did ground the plug to the engine block!

AnneJ, May 01, 2012

i know that it can be very frustrating to have issues with your lawn mower. if you are not getting a spark, then i would recommend that you change the spark plug first. this should be done at the beginning of the season. on the coil you should notice a small black wire plugged onto a spade terminal. unplug that wire and then check for spark. if you still do not have spark we either have a bad coil or the magnets on the flywheel are bad.

if you do have spark with the black wire unplugged we�re going to be looking for an issue with the kill circuit. on this mower, that is a pretty basic circuit. the little black wire should run from the coil down to the zone control bracket assembly. the zone control is what kills the mower when you release the handle. at the bottom end of that cable there is a bracket that contains a spring and some linage. if you look closely around that bracket you should see where the black wire connects. if it�s grounding out there, you will never have spark with the black wire plugged in. if you need further assistance, please reply to this thread. thank you for using manage my life.

Jim, May 05, 2012

thank you! new plug gives spark. now....... when then motor fires, it appears to be firing early: i'm using the elec start, and have the covers removed still. i push the red gas button a few times and turn the key. when the motor fires, the revolving flywheel appears to stop and go counter-clockwise slightly, then resume the direction the elec start is sending it (clockwise). the motor may attempt to start a few times between red button pushes, but it always has this same motion and effect. i have never pulled the flywheel nor moved the coil.


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