Kohler Magnum 18 spark plug gap?

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Hi, I'm working a freinds old sears lawn mower with MV18 motor
What is the correct spark plug gap?
on Kohler's site the service manuals says .025, but there owner's manual says .035.

It was a very neglected mower, but it's running much better now after I changed the oil and filter, new air filter, adjusted the carb, cleaned out the cooling fins that were full of mouse nests . more than that acually, long story............

it's oil wasn't changed for how many years?, I put Citco 30 wt in it, It got dirty fast, but doesn't seem to be burning any yet. Odd thing somebody removed the Breather tube and then left the hole open on the bottom of air cleaner base, so it ran for years with unfiltered air.
 
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Either will work- that difference doesn't amount to a hill of beans. My M10 runs at either gap without issue.
 
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