Yes, overheating can do a lot of damage. Which cylinder number is oiling the spark plug.

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2007 Toro 6.5hp
2006 BMW X5 4.4 ltr (his)
2006 Kawasaki Concours
2001 BMW X5 4.4 ltr (hers)
1994 Honda XR650L
1984 Honda XR80

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Benjamin Franklin