Jun 4, 2017 / Briggs and Statton 12.5 Engine Won't Start but Does Backfire. #2. First thing is a new plug, buy a few. Depending upon the gas you are getting where you are, some times when a pug gets wet that's the end of the plug . The fuel is conductive at combustion pressures and the spark runs down the side of the insulator. I've got a Briggs and Stratton 11K/12K standby generator that won't start. It shows running hours on the display but now fault code. Model EM12. Pushing the manual start won't work. I admit the batter … read more A Briggs & Stratton snowblower won’t start when there is a lack of fuel, air, or spark due to an empty fuel tank, old gasoline, bad spark plug, clogged fuel line, dirty carburetor, faulty starter, bad fuel cap or incorrect starting procedures. Remove the spark plug before performing any repairs. Take all safety precautions provided in the Overfilling the gas tank won't cause a mower to not start. Overfilling the gas tank however can lead to problems due to heat expansion so you should remove the excess fuel before leaving the mower in the sunshine. Engine flooding happens not by overfilling but rather letting too much gas into the engine. This may happen if you press the priming

6,390. Sep 25, 2020 / Craftsman briggs and stratton Platinum 21 HP 540cc XRD. #4. Okay, could be 2 or three things, the first is least likely which is a weak starter, 2nd would be valves out of adjustment, 3rd, is this engine has the briggs and stratton 793880 camshaft, prone to wiping the Compression release out in it and causing hard starting.

Sep 17, 2019 / B&S 128M02 Won't Start. #1. I have a Briggs and Stratton 128M02-0133-F1 on a push mower that won't start. Diagnosing this is my intro to small engines so I'm pretty green. I've done a few things to try to fix it thus far but nothing has worked. The things I've done: Replaced spark plug (it was pretty clean, set the new gap @ 0.030) lIL5h.
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    • briggs and stratton troubleshooting won t start