User Guide

ManualsBrandsKymco ManualsOtherMO BW 50

10. CRANKCASE/CRANKSHAFT

10-0

BET & WIN 50

__________________________________________________________________________________

CRANKCASE/CRANKSHAFT

__________________________________________________________________________________

SERVICE INFORMATION........................................................ 10-1

TROUBLESHOOTING.............................................................. 10-1

CRANKCASE SEPARATION .................................................... 10-2

CRANKSHAFT REMOVAL....................................................... 10-2

CRANKSHAFT INSPECTION ................................................... 10-3

CRANKSHAFT INSTALLATION.............................................. 10-4

CRANKCASE ASSEMBLY ....................................................... 10-6

Summary of content (8 pages)

PAGE 1
0.
PAGE 2
10. CRANKCASE/CRANKSHAFT BET & WIN 50 SERVICE INFORMATION GENERAL INSTRUCTIONS • This section covers crankcase separation to service the crankshaft. • The following parts must be removed before separating the crankcase. Engine (Section 5) Driven pulley (Section 7) Carburetor (Section 12) A.C. generator (Section9) Oil pump (Section 4) Cylinder head/cylinder (Section 6) Reed valve (Section 12) • When the left crankcase must be replaced, remove the following part in addition to the above.
PAGE 3
10. CRANKCASE/CRANKSHAFT BET & WIN 50 CRANKCASE SEPARATION Remove the crankcase attaching bolts. Bolts Attach the crankcase puller on the right crankcase and remove the right crankcase from the left crankcase. Crankcase Puller CRANKSHAFT REMOVAL Crankcase Puller Attach the crankcase puller on the left crankcase and remove the crankshaft from the left crankcase. °Ø When removing the crankshaft, do it slowly and gently.
PAGE 4
10. CRANKCASE/CRANKSHAFT Remove the remaining bearing on the crankshaft side using the universal bearing puller. °ØWhen separating the crankcase, the oil seals must be removed. Replace the oil seals with new ones. Universal Bearing Puller CRANKSHAFT INSPECTION Measure the connecting rod big end side clearance. Service Limit: 0.6mm replace if over Measure the connecting rod big end radial clearance at two points in the X and Y directions. Service Limit: 0.
PAGE 5
10. CRANKCASE/CRANKSHAFT BET & WIN 50 Measure the crankshaft runout. Service Limit A B 0.150mm replace if over 0.100mm replace if over Check the crankshaft bearings for excessive play. The bearings must be replaced if they are noisy or have excessive play. Play Play Axial Radial CRANKSHAFT INSTALLATION Wash the crankshaft in cleaning solvent and then check for cracks or other faults. °Ø• After check, apply clean engine oil to all moving and sliding parts.
PAGE 6
10. CRANKCASE/CRANKSHAFT Drive a new crankshaft bearing into the right crankcase. BET & WIN 50 Bearing Outer Driver Handle A Bearing Outer Driver, 37x40mm Bearing Driver Pilot, 17mm Drive a new crankshaft bearing into the left crankcase. Bearing Outer Driver Handle A Bearing Outer Driver, 42x47mm Pilot, 20mm Install the crankshaft into the left crankcase. Crankcase Assembly Tool °Ø • Apply KYMCO ULTRA motor oil or molybdenum disulfide to the crankshaft bearings and connecting rod big end.
PAGE 7
10. CRANKCASE/CRANKSHAFT CRANKCASE ASSEMBLY BET & WIN 50 Dowel Pins Install the dowel pins and a new gasket to the crankcase mating surface. Assemble the crankcase halves. Crankcase Assembly Tool The distance between the right crankcase oil seal and crankcase surface is about 12.5±0.5 mm. °Ø When installing the oil seal, be careful to press it with even force.
PAGE 8
10. CRANKCASE/CRANKSHAFT The distance between the left crankcase oil seal and crankcase surface is about 1.0mm. Oil Seal 1.0mm Install and tighten the crankcase attaching bolts. °Ø After assembly, check the crankshaft for smooth operation.