Yamaha F4 Service Manual
Also see for F4: Owner's manualOwner's manualBrochure & specsOwner's manualOwner's manual
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ECRANKCASE, CRANKSHAFT AND CAMSHAFTPOWRa10 mm (0.4 in)Piston-to-cylinder clearance1. Calculate:9Piston-to-cylinder clearanceOut of specification Æ Replace thepiston and piston rings, the cylinderor both.Piston pin inspection1. Measure:9Piston pin outside diameterOut of specification Æ Replace thepiston pin.Piston ring inspection1. Measure:9End gap aOut of specification Æ Replace thepiston ring.NOTE:Push the piston ring into the cylinder withthe piston crown.5-31Oversize piston diameter:*Over size 1 : 59.25 mm (2.333 in)Over size 2 : 59.50 mm (2.343 in)Piston-to-cylinder clearance:0.035 ~ 0.065 mm(0.0014 ~ 0.0026 in)Piston pin outside diameter:12.995 ~ 13.000 mm(0.5116 ~ 0.5118 in)Piston-to-cylinderclearanceCylinderborePistondiameter= -End gap (installed)Top ring:0.10 ~ 0.20 mm(0.004 ~ 0.008 in)2nd ring:0.25 ~ 0.40 mm(0.010 ~ 0.016 in)Oil ring:0.2 ~ 0.7 mm(0.008 ~ 0.028 in)*Except for USA |
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