Husqvarna SMR Owner's Manual

Also see for 450 Rancher: Operator's manual Operator's manual Operator's manual Spare parts Operator's manual

Contents

35SPARK PLUG CHECKUse NGK CR8EB spark plug; the gap is 0.027 in.A wider gap may cause difficulties in starting engine and inoverloading coil.A gap that is too narrow may cause difficulties when accelerat-ing, when idling the engine or when performing at lowspeeds.Clean the dirt away from the base of the spark plug before re-moving it from the cylinder after removing the cap (1).It is very useful to examine the state of the spark plug just afterit has been removed from the engine since the deposits on theplug and the colour of the insulator provide useful indications.Correct heat rating:The tip of the insulator should be dry and the colour should belight brown or grey.High heat rating:In this case, the insulator tip is dry and covered with dark deposits.Low heat rating:In this case, the spark plug is overheated and insulator tip is vitre-ous, white or grey in colour.CAUTION*: Select a spark plug with a colder orhotter heat range carefully and cautiously. Aspark plug with too hot a heat range maylead to preignition and possible engine dam-age. A spark plug with too cold a heat rangemay foul as the result of too much carbonbuildup.Before refitting the plug, thoroughly clean theelectrodes and the insulator using a brass-met-al brush.Apply a little graphite grease to the sparkplug thread; fit and screw the spark plug byhand then tighten to the torque of 10÷12 Nm-7.4÷8.9 ft/lb. Loosen the spark plug thentighten it again to the torque of 10÷12 Nm-7.4÷8.9 ft/lb.Spark plugs which have cracked insulators orcorroded electrodes should be replaced.VOLTAGE REGULATOR (TXC-TE-SMR)The voltage regulator (3) is fitted to the right side of the chas-sis, on the front.231ENCap6_GB 11-07-2007 17:17 Pagina 35