Plastic Recoil cover , lighter 2 pawl Flywheel, and manual oiler , the recoil was the downfall. they fail to easily and 2 pawl, I have one I coverted to regular 2100 recoil,
My Kubota Z724X bought in 2018, has 23hp Kawa , no issues so far been good , but I think as mentioned the quality has gone down in the last couple years ,
Have you tried duel porting the muffler, and open up factory exhaust if you haven’t those, 550, 562,572 , are to restricted from factory, if anything to get the heat out of engine,
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