This table is a quick reference guide, which summarizes part of the troubleshooting process. Use it to outline possible problem areas, then refer to the specific chapter or section involved.

TROUBLESHOOTING GUIDE

Item Problem or Cause Things to Check

Loss of power Poor compression Piston rings and cylinder
Head gaskets
Crankcase leaks

Overheated engine Lubricating oil supply
Oil pump
Clogged cooling fins
Ignition timing
Slipping clutch
Carbon in combustion chamber

Improper mixture Dirty air cleaner
Starter lever position
Restricted fuel flow
Gas cap vent hole

Miscellaneous Dragging brakes
Tight wheel bearings
Defective chain
Clogged exhaust system

Steering Hard steering Tire pressures
Steering damper adjustment
Steering stem head
Steering head bearings
Steering oil damper

Pulls to one side Unbalanced shock absorbers
Drive chain adjustment
Front/rear wheel alignment
Unbalanced tires
Defective swing arm
Defective steering head
Defective steering oil damper

Shimmy Drive chain adjustment
Loose or missing spokes
Deformed rims
Worn wheel bearings
Wheel balance

Gearshifting difficulties Clutch Adjustment
Springs
Friction plates
Steel plates

Transmission Oil quantity
Oil grade
Return spring or pin
Change lever or spring
Drum position plate
Shift drum
Shift forks

Brakes Poor brakes Worn linings or pads
Brake adjustment
Oil or water on brake linings or pads
Loose linkage or cables
Low brake fluid level

Noisy brakes Worn or scratched lining or pads
Scratched brake drums or disc
Dirt in brakes

Unadjustable brakes Worn linings or pads
Worn drums or disc
Worn brake cams