what to check for on used mower?

[recycledsole]

Hey guys,
im looking at a used mower tommorow and im wondering if anyone can tell me the necesary things to look for when buying a used mower.
i am thinking for any leaks, rough wear, rust, etc... supposedly its less than a year old commercial 26" exmark metro (not the pre 2006 versions)

any advice is appreciated
thank you very much

[Blades Lawn Maintenance]

I wanna see what people are going to say about this.

[TNGrassCutter]

Dents, dings, rust, scrapes, scratches, bent parts, worn belts, worn blades, worn tires, steers straight, leaks fluid, wires hanging out, dirty, replaced parts, hours, stuff zip tied together, motor run smoothly, does it smoke, tick, knock, have oil in it, fresh grease in zerks, and pretty much the overall condition of the machine.
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[recycledsole]

hello
just got back it was 26" metro with kawasaki engine only 179CC made in july 2008 (good its not 2006 or previous) i told him i would think about it. he wanted $900
i am wondering is it normal for metros or exmarks not to hold their idle? it waivers, like it sounds like the mower will turn off every 5 seconds- only when blade is not engaged.
thank you