ENOTICEThis manual has been prepared by the Yamaha Motor Company Ltd. primarily for use byYamaha dealers and their trained mechanics when performing maintenance procedures andrepairs to Yamaha equipment. It has been written to suit the needs of persons who have abasic understanding of the mechanical and electrical concepts and procedures inherent in thework, for without such knowledge attempted repairs or service to the equipment could renderit unsafe or unfit for use.Because the Yamaha Motor Company Ltd. has a policy of continuously improving its prod-ucts, models may differ in detail from the descriptions and illustrations given in this publica-tion. Use only the latest edition of this manual. Authorized Yamaha dealers are notifiedperiodically of modifications and significant changes in specifications and procedures, andthese are incorporated in successive editions of this manual.A10001-0*50G, 60F, 70B, 75C, 90ASERVICE MANUAL1999 Yamaha Motor Co., Ltd.1st Edition, February 1999No part of this publication may bereproduced or transmitted in any form or byany means including photocopying andrecording without the written permission ofthe copyright holder. Such writtenpermission must also be obtained beforeany part of this publication is stored in aretrieval system of any nature.