2008 Yamaha Motorsports Phazer GT Owners Manual - Page 55

Periodic maintenance 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. Specified spark plug: Manufacturer: NGK Model: CR9EKB 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) Spark plug gap: 0.6-0.7 mm (0.024-0.028 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 CAUTION: Make sure that the spark plug caps are securely installed. Otherwise the spark plug caps could be damaged due to engine vibration. ESU11810 Adjusting the engine idling speed ECS00400 CAUTION: G G Be sure to have a Yamaha dealer make this adjustment. Make sure that the throttle lever moves smoothly. Start the engine and warm it up. Select the engine speed meter mode. (See page 11 for details.) Remove the rubber cap. 1. 2. 3. 1. Spark plug gap 2. Spark plug reach Before installing any spark plug, measure the electrode gap with a wire thickness gauge and adjust to specification. 1. Rubber cap 49