Briggs and Stratton- 126M02-1525-f4 No Start


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Old 08-13-18, 10:15 AM
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Briggs and Stratton- 126M02-1525-f4 No Start

Hi all, having trouble with my Craftsman mower. It has a Briggs and Stratton (model #126M02-1515-F4) engine. The engine won't crank. It's been having a hard to crank problem for the last few times I've gone to use it but not it seems to have died. Seems it is not getting any spark. I appreciate any guidance on what and how I should check. Thanks.
 
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Old 08-13-18, 10:18 AM
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I failed to mention it has a brand new spark plug in it. Thanks.
 
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Old 08-13-18, 10:21 AM
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Does it spin over well and just doesn't start? Or is it slow to turn over when you hit the start key?
 
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Old 08-13-18, 03:47 PM
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It spins well but just does not start.
 
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Old 08-13-18, 04:14 PM
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Check for spark in a dark area with the spark plug out of the head and grounded. If no spark trace the spark plug wire back to the coil. There will be a small wire attached, running parallel to the plug wire. Disconnect that wire and check for spark again.

If no spark, the coil is likely bad. Replace with a genuine Briggs coil. There's a lot of cheap ones out there that don't work.
 
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Old 08-14-18, 10:41 AM
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Ok, thanks. I will try the coil.
 
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Old 08-18-18, 02:18 PM
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Well, I ended up getting my hands on a multi-meter; I checked the reading on the old coil as illustrated on a youtube video and it was 6.48. I purchased a new coil and checked the reading on it with the multi-meter and it was 6.38. I have not changed out the coils since the readings were similar. Could my problem still be the coil? If not, what else to I need to check for? Thanks.
 
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Old 08-18-18, 03:18 PM
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There will be a small wire attached, running parallel to the plug wire. Disconnect that wire and check for spark again.

If no spark, the coil is likely bad. Replace with a genuine Briggs coil. There's a lot of cheap ones out there that don't work.
Resistance testing doesn't work too well, since the heat build up when the coil is running can push the resistance outside the acceptable parameter. So you may have a bad coil that tests good and fails when running. When you have no spark, do the test above.

The value of using genuine parts lies in the parts being designed in assemblies where their components work together. Those give you the desired results. A lot of the aftermarket parts may use criteria per component that gives you an acceptable range of tolerance. But when they are put together the tolerances collectively add up to failure - if that makes any sense.
 
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Old 08-19-18, 05:47 AM
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Ok, I see. Thanks. Yes, using genuine Briggs and Stratton parts for sure.
 
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Old 08-21-18, 08:35 AM
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I ended up taking the mower to a shade tree mechanic "shop" The guy working there immediately stated my problem sounded like a valve problem. He pulled the head off and low and behold there was a piece of mulch stuck in the valve. How in the world that that got there? I have no idea.

:wall
 
 

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