User manual YAMAHA RS100

[. . . ] If you have any questions concerning the operation or maintenance of your snowmobile, please consult a Yamaha dealer. To maintain the high quality and performance of this snowmobile, it is important that you and your Yamaha dealer pay close attention to the recommended maintenance schedules and operating instructions contained within this manual. RS10010090RX RS10010090GTX RS10010090GTAX RS10010090LTX RS10010090LTGTX OWNER'S MANUAL ©2007 by Yamaha Motor Corporation, U. S. A. 1st Edition, April 2007 All rights reserved. [. . . ] 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 could indicate an intake track air leak or carburetion problem for that cylinder. Do not attempt to diagnose such problems yourself. Instead, take the snowmobile to a Yamaha dealer for inspection and possible repairs. 1. Spark plug reach Before installing any spark plug, measure the electrode gap with a wire thickness gauge and adjust to specification. 42 Periodic maintenance 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 CAUTION: Make sure that the spark plug caps are securely installed. Otherwise the spark plug caps could be damaged due to engine vibration. ESU12900 Standard engine idling speed: 1300­1500 r/min 4. Lift up the air filter element frame and check the air filter element. If there is any snow on the air filter element, remove the element, brush off the snow, and then install the air filter element. 1. Headlight unit bolt 3. Unfasten the plastic band around the wire harness. 1. 5. Disconnect the cylinder head breather hose. Unhook the air filter case cover fasteners. Place the air filter element frame in the original position, and then install the air filter case cover. Hook the fasteners onto the air filter case cover. Connect the cylinder head breather hose. Install the headlight unit, making sure to insert the projections on the headlight unit stay into the slots on the bottom of the headlight unit. 8. 1. Cylinder head breather hose 6. Slightly lift up the headlight unit, and then remove the air filter case cover. 45 Periodic maintenance Your snowmobile can be adjusted to overcome most of the problems found in high-altitude riding. Carburetor adjustments are the most important. Less air at high altitude makes the air/fuel ratio too rich, which can cause poor performance. [. . . ] 1 Self-diagnosis device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Shift lever . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Shroud and covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Shroud and covers, removing and installing . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ]