I am guessing that this is your ENGINE model number: 126K02-0512-B1
Using this reference:
http://www.partstree.com/parts/?lc=briggs_and_stratton&mn=126K02-0512-B1&dn=35820003
Check to make sure that the choke item number 97 is not sticking.
Then remove the float bowl nut and float bowl assy. Clean the fuel passages in the base of the carb with carb cleaner including the area where the bowl nut screws into. There is a fixed jet orifice that must be cleaned in the threaded area. Also clean the visible brass tubes in the top of the carb.
Check fuel flow with the bowl removed. You should have a good fuel flow with the float angled down and as you lift it level fuel flow should STOP. If you do not have fuel flow... remove the float pin, drop the float and needle and celan out the hole where the float needle was. Remove the main fuel line and check for fuel flow. Use carb cleaner in the hole where the fuel line connects. If you do not have feul flow from the fuel tank.. check the tank port and look for any kind of in line filter. If you find a filter... check the line before and after the filter for fuel flow. Once you have established fuel flow Reassemble carb
Check the spark.... if you have no spark
First check the thermostat by just disconnecting it. Item 291
http://www.partstree.com/parts/?lc=briggs_and_stratton&mn=126K02-0512-B1&dn=35820004
Then retest your spark. If you have spark with the thermostat disconnected the themostat is bad. (Most engines use a low oil level sensor..... this one uses the thermostat)
There is an electrical contact on the throttle plate that is grounded when the throttle is selected to off. Make sure the throttle plate lever moves off of the contact when you advance the throttle. ALSO... there is another ground / contact on the engine brake. Make sure that when the engine brake is released that the brake lever moves away from the ignition grounding contact.
The above are the basics.... If after doing ALL of the above you still have problems with ignition then suspect the ignition components.
Thanks for choosing FixYa,
Kelly
BAD GAS OR CARB. NEEDS CLEANING......SPRAY SOME STARTER FLUID DIRECTLY INTO CARB. (TAKE THE AIR FILTER OFF FIRST) IF IT CRANKS, AND GOES DEAD, THEN ITS BAD GAS OR DIRTY CARB....DUMP GAS OUT OF TANK,GAS LINE AND BOWL, NEW GAS AND TRY IT(MIGHT NEED TO SPRAY IT A FEW TIMES TO GET IT GOING....IF IT STILL KEEPS GOING DEAD....THEN REMOVE CARB. AND CLEAN IT......
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Good luck. I bought this mower to save money (rather than hiring someone to mow my lawn). Bad idea. I've had to have it serviced after every other mowing, and I have 1/8 acre. The Sears sales clerk at the store where I bought it claims that I simply did not put in the proper maintenance... well, after having it tuned up, new oil filter, spark plug carb cleaned AND using special, expensive no-ethanol gas, it was good for one mowing. Well covered with water-proof tarp, it still apparently drew in moisture enough so that it barely starts. Moisture may be it, but who knows. This piece of metal is so high-maintenance, it could be anything.
The tarp will keep the water off the machine but not out of it. A little water in the fuel can cause major problems as you well know. Kelly's answer below will help you fix it but to keep it running through the year and to stabilize the gas during the winter, try adding SeaFoam (you can find it at Walmart or any auto parts store) to your gas in the recommended ratio. It will do wonders for you machine helping to keep the engine and fuel lines clean during the summer and helping to prevent your gas from turning into varnish during the winter. Also check out this article on winterizing a lawn mower.https://www.familyhandyman.com/automotiv...
One thing that is common with this machine is the kill switch mechanism. I t has to come completely off when you pull the handle back to set it. Some of the time it will slip and, the kill switch will remain engaged. A simple alignment of the cable will fix it till it slips again. Then it won't start. You can change the cable and it may fix it but, if that kill switch does not disengage it is simply out of alignment. It is not being pulled far enough to disengage the kill system.
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