Clutch-Out Failure; Poor Standing Start (Low Climbing Ability); Poor Acceleration (Poor High Speed); Over Heating - Yamaha MBK YQ100 Service Manual

CLUTCH-OUT FAILURE

Primary pulley
• Seized primary sliding pulley and collar

POOR STANDING START (LOW CLIMBING ABILITY)

V-belt
• Worn, damaged or slippery v-belt
Primary pulley
• Worn or improper operation of weight

POOR ACCELERATION (POOR HIGH SPEED)

V-belt
• Worn or greasy V-belt
Secondary pulley
• Worn or greasy clutch shoe
• Improper operation of secondary sliding pulley

OVER HEATING

OVER HEATING
Ignition system
• Improper spark plug gap
• Improper spark plug heat range
• Faulty ignitor unit
Fuel system
• Improper carburetor setting
• Improper fuel level adjustment
• Clogged air cleaner element
• Lean mixture (Air in the autolube pump)
Compression system
• Heavy carbon deposit build-up
FAULTY AUTOMATIC/
OVER HEATING
Secondary pulley
• Broken or fatigued clutch shoe spring
Secondary pulley
• Fatigued compression spring
• Improper operation of secondary sliding pulley
Engine oil
• Improper engine oil quality (high viscosity)
• Low engine oil quality
Brakes
• Dragging brake
Cooling fan
• Damaged cooling fan
• Damaged air shrouds
8-4
TRBL
SHTG