The engine rpm- is this what the problem or the speed of mowing. drag check blade area for rope/items around bearing areas, also wheels same thing.
I take it its a Briggs motor
It sounds like 2 possibilities
1 possible half sheared flywheel key causing out of time conditions
2 carb is dirty not due to your new gas filter but dirt through air inlet and needs to be taken off diassembled and cleaned (carb cleaner and determine all jets and small orfice holes are clean.
SOURCE: mower backfires and loss of power
i would also check fuel flow. pull the gas line from the carb and see if gas flows out at a good rate (into a metal can of course) or if it trickles out. if the latter, then gas tank either has junk at the bottom preventing the gas from flowing or the vent hole (usually on the gas cap) is plugged.
i have also had my carb float bowl rust out on me, but that took 10 years.
if anti back fire selonoid is disconnected how
are you getting fuel? if so ck selonoid again make sure it is open. should run
SOURCE: Craftsman LT1000 riding mower with 18hp B&S
There is a compression release device on the cam shaft to allow the engine to spin easier when starting. This is likely the culprit because the starter isn't strong enough to push the engine past full compression. The fix is to replace the cam shaft.
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