2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 243Get this manual

CONSTANT VELOCITY JOINTS AND DIFFERENTIAL GEAR

2.Inspect: Drive shaft splines Universal joints Front drive gear splines Weardamage ReplaceSpring Fatigue ReplaceMove the spring up and down
3.Inspect: Front drive shaft Bends Replace
WARNING

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives