I have recently gotten a 1965 Johnson Super Sea Horse 60hp Model VXL-11C. It starts and idles very good. I think it is running rich at the high throttle though. Very smokey like it is rich. How do I adjust the high speed? How can I tell if it is right? Should the old motor be really smokey for a two stroke? Also, can anyone show me where the drain is for the lower unit oil, check level and fill are? What is the proper procedure for checking the lower unit oil? Thanks?