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BTW, I didn't mention oil change frequency or type in the original post because I didn't want to get off on a tangent about "Best oil", too often / not often enough, etc since what I'm doing now works for me. Just wanted to stay focused on their particular situation. I see so many threads...

Blue, def oil. Uses about 1/2 qt every 10 or so hours. I change oil & filter every 50 hrs in all my machines.

Thanks, getting it bored and oversized pistons/ rings is really not an option for me without having access to a machine shop on the cheap. Sending it out would run into more expense than replacement. Do you know if an EFI version is adaptable? I can get one for about $1700? Or again just less...

Both plugs were fouled pretty badly and evenly so I figured I could rule out valve stem seals (unless they went bad on both heads at approx the same time.) I have 125# compression on cyl 1 but only 90# on #2. No appreciable leak down on either side. I did adjust valve lash. Nothing weird noticed...

I am hoping for advice from a seasoned Kawasaki engine tech. Here's what I have: a 9 year old Hustler Super Z that has had several parts replaced, good pumps and motors, mows great but has right at 2000 hrs on the Kaw FX850V-CS12 and is using oil. From personal experience, this is the beginning...