User manual YAMAHA RS VENTURE-2008

[. . . ] OWNER'S MANUAL RST90X RST90GTX LIT-12628-02-65 8ET-28199-13 ESU10040 Introduction ESU10120 Congratulations on your purchase of a Yamaha snowmobile. This model is the result of Yamaha's vast experience in the production of fine sporting and touring snowmobiles. It represents the high degree of craftsmanship and reliability that have made Yamaha a leader in these fields. This manual will give you an understanding of the operation, inspection, and basic maintenance of this snowmobile. [. . . ] Consult a Yamaha dealer before changing to a different type of spark plug. Specified spark plug: Manufacturer: NGK Model: CR8E 1. Tool kit ECS00360 CAUTION: Before starting the engine, make sure that the tool kit is properly seated in its holder and is securely fastened. NOTE: If you do not have a torque wrench available during a service operation requiring one, take your snowmobile to a Yamaha dealer to check the torque settings and adjust them if necessary. ESU11780 Spark plugs are produced in several different thread lengths. The thread length or reach is the distance from the spark plug gasket seat to the end of the threaded portion. If the reach is too long, overheating and engine damage may result. If the reach is too short, spark plug fouling and poor performance may result. Also, if the reach is too short, carbon will form on the exposed threads resulting in combustion chamber hot spots and thread damage. Always use a spark plug with the specified reach. Spark plug reach: 19. 0 mm (0. 75 in) Checking the spark plugs The spark plug is an important engine component and is easy to inspect. The condition of the spark plug can indicate the condition of the engine. Check the coloration on the white porcelain insulator around the center electrode. The ideal coloration at this point is a medium to a light tan color for a snowmobile that is being ridden normally. If a spark plug shows a distinctly different color, there could be something wrong with the engine. For example, a very white center electrode porcelain color 1. Spark plug reach 42 Periodic maintenance Before installing any spark plug, measure the electrode gap with a wire thickness gauge and adjust to specification. Spark plug gap: 0. 7­0. 8 mm (0. 028­0. 031 in) When installing the spark plug, always clean the gasket surface. Wipe off any grime from the threads and tighten the spark plug to the specified torque. Spark plug tightening torque: 12. 5 Nm (1. 25 m·kgf, 9 ft·lb) ECS00380 1. Throttle stop screw Standard engine idling speed: 1300­1500 r/min ESU11821 CAUTION: Make sure that the spark plug caps are securely installed. Otherwise the spark plug caps could be damaged due to engine vibration. ESU11792 Adjusting the throttle cable free play ECS00410 CAUTION: Be sure to adjust the engine idling speed first. Turn the adjusting bolt in or out until the specified throttle cable free play is obtained. Adjusting the engine idling speed ECS00390 CAUTION: G G G Be sure to have a Yamaha dealer make this adjustment. Make sure that the throttle lever moves smoothly. [. . . ] 24 Ski spring preload, adjusting . . . . . . . . . . . . . . . . . . . . 24 Skis and ski runners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Spark plugs, checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ]