Yamaha 2001 YZF-R6M Owner's Manual

Contents

PERIODIC MAINTENANCE AND MINOR REPAIR6-96EAU01639Spark plug inspectionThe spark plug is an important enginecomponent and should be inspectedperiodically, preferably by a Yamahadealer. The condition of the spark plugcan indicate the condition of the en-gine.Normally, all spark plugs from thesame engine should have the samecolor on the white insulator around thecenter electrode. The ideal color at thispoint is a medium-to-light tan color for amotorcycle that is being ridden normal-ly. If one spark plug shows a distinctlydifferent color, there could be some-thing wrong with the engine.Do not attempt to diagnose such prob-lems yourself. Instead, take the motor-cycle to a Yamaha dealer. The sparkplugs should be periodically removedand inspected because heat and de-posits will cause any spark plug toslowly break down and erode. If elec-trode erosion becomes excessive, or ifcarbon and other deposits are exces-sive, the spark plug should be replacedwith the specified plug.Before installing any spark plug, mea-sure the electrode gap with a wirethickness gauge and adjust it to specifi-cation.When installing a spark plug, the gas-ket surface should always be cleanedand a new gasket used. Any grimeshould be wiped off from the threadsand the spark plug tightened to thespecified torque.NOTE:@If a torque wrench is not available wheninstalling a spark plug, a good estimateof the correct torque is 1/4 to 1/2 turnpast finger tight. The spark plug shouldbe tightened to the specified torque assoon as possible.@a. Spark plug gapSpecified spark plug:CR10EK (NGK)Spark plug gap:0.6 ~ 0.7 mmTightening torque:Spark plug:12.5 Nm (1.25 m·kg)