INTRODUCTION This Operation Manual describes Sail-Drive Models SD20, SD50, SD50-4T. For engine handling and operation, refer to the respective operation manuals for Engine Models 1GM10C, 2YM15, 3YM20, 3YM30, 3JH4CE, 3JH5CE, 4JH4ACE, 4JH5CE and 4JH4-TCE. However, instructions for the marine gear box are not necessary as they are included. Engines and Sail-Drive combinations are available as follows: SD Operation Manual 1 © 2009 Yanmar Marine International Engine model Sail-Drive Model 1GM10C SD20 2YM15 3YM20, 3YM30 3JH4CE SD50 3JH5CE 4JH4ACE 4JH5CE 4JH4-TCE SD50-4T