2012 cbr600rr I'm rebuilding from a wreck has 6k on the dash. However I found oil on the sparkplugs. Bike wasn't sluggish or having any misfires but just smokes out the exhaust. Changed the air filter made sure there was no oil in the air box. Changed the oil and coolant and it looked fine. Any ideas would be appreciated. I'm thinking valve cover gasket or head gasket I'm going to replace the plugs and see if it simmers the smoke down.