I recently purchased a GW 226 with a 2005 200 HPDI but a Yamaha Owners Manual didn't come with it. On the Yamaha website you can buy the Owners Manual for $20 or the Service Manual for $93. I plan to do my own basic maintenance and winterization. Is it better to have both manuals? or do I only need the Owners Manual? Would there be anything useful to me in the Service Manual or do I only need that if I am taking apart the engine?