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Message: <blockquote data-quote="guyg" data-source="post: 522741" data-attributes="member: 24928"><p>I picked up a boat last year with an '03 Yamaha F40 4 stroke. Seems to run pretty good, though my fall maintenance actions of new plugs, oil change, lower unit change, etc. made me think the previous owner was overstating the recent maintenance actions a tad.  I'm thinking about picking up the Yamaha Diagnostic Software and cables off of the large online retail site, but I don't know if it will actually connect as I've no idea where the plug is, and if it does if it will give me much in the way of useful information on the motors condition.  Does anyone have any experience with this motor, or other motors of this vintage, and this software?</p></blockquote><p></p>