I have an 1970 Evinrude 40 hp model 40052-A, Other than changing the sprark plug what other basic maintance can I do to get it running like the day it was new. Is it safe to spray the motor with some form of carb. cleaner. Is it possible to rebuild this motor with a kit( is one avail.). or maybe overhaul it.<br /><br />Thanks,<br />Paul- Houston, Texas