230747-766Spark Plugs NOTE: Always use the recom-mended spark plugs in the engine.See the appropriate specificationssheet for correct spark plug gap.1. Disconnect the main harness from theignition coils; then remove the ignitioncoils from the cylinder head cover.2. Remove the three spark plugs. NOTE: Prior to installing the sparkplugs, check the gap between theelectrode and ground strap. Theclearance should be 0.7-0.8 mm(0.028-0.031 in.).3. Install new spark plugs. Tighten to1.3 kg-m (9.4 ft-lb).4. Install the ignition coils onto the cyl-inder head cover making sure theyare fully seated. Connect the mainharness to the ignition coils.5. Install the hood and access panels.Checking/AdjustingValve ClearanceAfter 40,000 km (25,000 miles), valveclearance should be checked and adjustedas necessary. NOTE: Take the snowmobile to anauthorized Yamaha Snowmobiledealer for inspection and service.This service is at the discretion andexpense of the snowmobile owner.BatteryThese sealed batteries after being in ser-vice require regular cleaning and charg-ing in order to deliver peak performanceand maximum service life. The followingprocedure is recommended for cleaningand maintaining sealed batteries. Alwaysread and follow instructions providedwith battery chargers and battery prod-ucts. NOTE: Battery maintenance maybe done by the snowmobile owner ifqualified to do so. If the owner doesnot feel qualified, take the snowmo-bile to an authorized Yamaha Snow-mobile dealer for this service. Thisservice is at the discretion andexpense of the snowmobile owner.CAUTIONIf the coolant is below the neck and ifcoolant has been added, immediatelyinspect for leakage and/or damage. Ifleakage or damage is detected, takethe snowmobile to an authorizedYamaha Snowmobile dealer for ser-vice. If not under warranty, this ser-vice is at the discretion and expenseof the snowmobile owner.CAUTIONIf adjusting spark plug gap is neces-sary, do not use the center electrodeas a leverage point. Damage to theplug may occur.CAUTIONIt is critical that the checking/adjust-ing valve clearance be done at therecommended intervals or severeengine damage may occur.! WARNINGImproper handling or connecting of abattery may result in severe injuryincluding acid burns, electrical burns,or blindness as a result of an explo-sion. Always remove rings andwatches. Any time service is per-formed on a battery, the followingmust be observed: keep sparks, openflame, cigarettes, or any other flameaway. Always wear safety glasses.Protect skin and clothing when han-dling a battery. When servicing a bat-tery in an enclosed space, keep thearea well-ventilated.