Had just changed oil, filter and air cleaner......mowed about an hour and running fine.....knew i had small oil leak but very slow....kept engine cover very clean but was dirty after this hour of operation.....hottest engine I have ever had...oil filter too hot for bare hand....oil stick super hot to touch.....so hot thought it was melted inside....hours later cleaned as before start of mowing and cranked right up.....didn't run but few minutes and seems heat was way too high under no wrk load....any suggestions would be most appreciated.....thanks