EPREFACEThis 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.F40BSERVICE MANUAL©1999 Yamaha Motor Co., Ltd.1st Edition, September 1999All rights reserved.No part of this publication may be reproducedor transmitted in any form or by any meansincluding photocopying and recording withoutthe written permission of the copyright holder.Such written permission must also be obtainedbefore any part of this publication is stored in aretrieval system of any nature.Printed in Japan