13.5 hp tecumseh rider runs for 45 min then dies. Will start after engine cools down. Mower is 2 years old, no problems before, fuel filter is clear as i took hose off from carb and fuel runs freely thru it. Plug is not fouled. did leave fuel in it over winter with no additive but have added fuel to tank once this season before problems started

Hi there ken1943363

check your carby for obstructions to air bleeds and jets , clean carby out and check fuel needle valve it may be sticking ? check grounding wire from coil to switch it could be grounding intermttantly ?

could also be a ignition armature going o/c when hot or a tank breather is not venting causing a vacuum loc in tank - check this 1st , then check out ignition armature 2nd

may need to place a ignition spark tester in line with ht lead and plug, re-run machine and see if coil is going o/c when unit gets hot , as before you will soon see

once you know if its the coil , replace it and reset air gap and you should be good to

cheers pauly46

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