2007 Yamaha Apex Factory Service Manual, Page 214Get this manual

2007 Yamaha Apex Factory Service Manual, Page 214

CRANKCASE 17Inspect: Bearings Clean and lubricate the bearings, then rotate the inner race with your fingerRough movementReplace18Inspect:
20Inspect: Timing chain Oil pump drive chain DamagestiffnessReplace the chain and sprocket as set 21Inspect: Timing chain