2008 Yamaha Motorsports FX Nytro RTX Owners Manual - Page 50

Periodic maintenance 2. Loosen the fasteners, and then remove the side cover. G G Keep your body and clothing away from rotating parts when servicing the snowmobile with the shroud or covers removed. Do not touch the hot muffler and engine during or immediately after operation. ECS00370 CAUTION: Make sure that all cables, leads, etc., are routed properly before installing the shroud and covers. 1. Right side cover 2. Fastener NOTE: When installing the shroud and covers, be sure to tighten the fasteners securely. ESU11780 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 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. You should periodically remove and inspect the spark plug because heat and deposits will cause a spark plug to slowly break down and erode. Consult a Yamaha dealer before changing to a different type of spark plug. 1. Left side cover 2. Fastener To install a side cover 1. Place the side cover in the original position, and then tighten the fasteners. NOTE: Be sure to insert the projection on the rear of the side cover into the hole in the fuel tank side cover and insert the projections on the front of the cover into the slots in the lower cover. 2. Install the shroud. EWS00090 WARNING G Do not drive the snowmobile with the shroud or covers unfastened or removed. 44