Spark plug (except 700 Diesel) The ATV comes equipped with a specifi ed spark plug (see techni- cal data). A light brown insulator indicates that the plug is correct. A white or dark insulator indicates that the engine may need to be ser- viced or the carburetor may need to be adjusted. Take the ATV to an authorized Arctic Cat ATV dealer. Use a feeler gauge to check the gap. When installing the spark plug, be Engine Idle RPM Adjustment (except 700 Diesel) To properly adjust the idle, a tacho- meter is necessary. If one is not available, take the ATV to an autho- rized Arctic Cat ATV dealer. (Diesel vehicles must always be taken to the dealer!) To adjust idle RPM: 1.
Start the engine and warm it up to normal operating temperature. 2. Turn the throttle stop screw in our out until the engine idles at the recommended RPM. q NOTE If the spark plug fails prematurely due to cold outside temperature, low speed or low RPM, please con- tact your Arctic Cat ATV dealer. sure to tighten it securely. A new spark plug should be tightened Ѕ turn once the washer contacts the cylinder head. A used plug should be tightened only 1/8 – ј turn. Before removing the spark plug, be sure to clean the area around the spark plug. If you do not, dirt could enter engine when removing or in- stalling the spark plug.
Adjust the gap on the 400/500 and 650 to 0,7-0,8mm for proper ignition. Page 42 Engine idle RPM 400 1250-1350 turns/min 500 650 1050-1150 turns/min