What causes CVT belt and roller wear causing slipping on the Yamaha Mio Sporty (mio 115)?

Test acceleration from stop, listen for whining rattle Estimated fix cost: $25-$60

What causes Crankshaft bearing noise from neglected oil changes on the Yamaha Mio Sporty (mio 115)?

Knocking sound at idle, vibration at mid-throttle Estimated fix cost: $120-$250

Headlight brightness at idle, electric starter cranking Estimated fix cost: $20-$70

Wet grime under engine, oily rear shock body Estimated fix cost: $15-$50

Known issues to inspect before buying a used Yamaha Mio Sporty (mio 115). What to check and how much repairs cost.

MODERATE

Test acceleration from stop, listen for whining rattle

Fix cost: $25-$60

SERIOUS

Knocking sound at idle, vibration at mid-throttle

Fix cost: $120-$250

MINOR

Headlight brightness at idle, electric starter cranking

Fix cost: $20-$70

MINOR

Wet grime under engine, oily rear shock body

Fix cost: $15-$50

☐Cold start it, no smoke allowed

☐Check frame number matches papers

☐Ride test for CVT slip

☐Inspect brake pads and tire age

Reliable and cheap if maintained regularly