I bought a used JD 757 as back up couple months ago,been running scagg with 35 vanguard,27,29 water cool kawasaki for 15 years and have never had this problem.I have good spark,checked compression on both cylinders.left side looking at from back of mower has 90 psi,right has 20 psi.I'm guessing bent push rods or worse.Any insight would be much appreciated.How expensive can this get?I have a 27 hp kawasaki water cool on an old scag will it fit?
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