Why does your 2005 king quad 700 blow blue smoke since oil change?

Blue smoke from your 2005 King Quad 700 after an oil change typically indicates that oil is getting into the combustion chamber. This could be due to worn piston rings, valve seals, or gaskets that are allowing oil to leak into the engine. It's also possible that the oil used during the change was too heavy, leading to improper combustion. Checking these components and ensuring the correct oil type is used can help diagnose and resolve the issue.