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i have a 10 year old fh580 that keeps bending push rods due to sticking valves. happened twice this season , first on the exhaust valve ,then the intake on the same cylinder. what causes sticking valves ? i'm assuming fuel grade might have a factor . is it time for new heads and valves ??

i'm having PTO problems on my 10 year old wright sentar. all is fine until roughly 15 minutes into mowing the blade shuts off . everything else keeps running. i've tried a new switch and new relay . at some point i'm going to run thru the wiring and make sure there are no breaks or something...