Yamaha YFM400FAR Service Manual
Also see for YFM400FAR: Owner's manualService manualAssembly manual
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Contents
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4 - 31ENGCYLINDER AND PISTON3.Measure: Ring end gapOut of specification → Replace.NOTE:You cannot measure the end gap on theexpander spacer of the oil control ring. If the oilcontrol ring rails show excessive gap, replaceall three rings.End gapStandard LimitTopring0.20 ~ 0.40 mm(0.0079 ~ 0.0157 in)0.65 mm(0.0256 in)2ndring0.40 ~ 0.60 mm(0.0157 ~ 0.0236 in)0.95 mm(0.0374 in)Oilring0.2 ~ 0.7 mm(0.0079 ~ 0.0276 in) —CHECKING THE PISTON PIN1.Check: Piston pinBlue discoloration/grooves → Replace, thencheck the lubrication system.2.Measure: Piston pin-to-piston clearance*****************************************************Measurement steps: Measure the piston pin outside diameter a.If out of specification, replace the piston pin. Measure the piston inside diameter b. Calculate the piston pin-to-piston clearancewith the following formula.Outside diameter (piston pin):19.991 ~ 20.000 mm(0.7870 ~ 0.7874 in) |
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