Dinli DL-901 Service Manual page 133

APPENDIX
Other:
Carburetor vacuum piston doesn't slide smoothly
Engine oil viscosity too high
Brake dragging
CDI unit trouble
Front or rear final gear case oil viscosity too high
Poor Running or No Power at High Speed:
Firing incorrect:
Spark plug dirty, broken, or maladjusted
Spark plug cap or Spark plugs lead trouble.
Spark plug cap shorted or not in good contact
Spark plug incorrect
Pickup coil trouble
CDI unit trouble
Ignition coil trouble
Fuel/air mixture incorrect:
Main jet clogged or wrong size
Jet needle or needle jet worn
Main air jet clogged
Bleed holes of air bleed pipe or needle jet clogged
Fuel level too high or too low
Air cleaner clogged, poorly sealed, or missing
Starter plunger stuck open
Water or foreign matter in fuel
Carburetor holder loose
Air cleaner duct loose
Fuel tank air vent obstructed
Fuel tap clogged
Fuel line clogged
Compression low:
Spark plug loose
Cylinder head not sufficiently tightened down
No valve clearance
Cylinder, piston worn
Piston rings bad (worn, weak, broken, or sticking)
Piston ring/groove clearance excessive
Cylinder head gasket damaged
Cylinder head warped
Valve spring broken or weak
Valve not seating properly (valve bent, worn, or
carbon accumulation on the seating surface.)
Knocking:
Carbon built up in combustion chamber
Fuel poor quality or incorrect
Spark plug incorrect
CDI unit trouble
Miscellaneous:
Throttle valve won't fully open
Carburetor vacuum piston doesn't slide smoothly
Brake dragging
Overheating
Engine oil level too high
Engine oil viscosity too high
Balancer mechanism malfunctioning
Front or rear final gear case oil viscosity too high.
Overheating:
Firing incorrect:
Spark plug dirty, broken, or maladjusted
Spark plug incorrect
CDI unit trouble
Fuel/air mixture incorrect:
Main jet clogged
Fuel level too low
Carburetor holder loose
Air cleaner poorly sealed, or missing
Air cleaner duct loose
Air cleaner clogged
Compression high:
Carbon built up in combustion chamber
Engine load faulty:
Engine oil level too high
Engine oil viscosity too high
Drive train trouble
Brake dragging
Lubrication inadequate:
Engine oil level too low
Engine oil poor quality or incorrect
Front or rear final gear case overheating:
Insufficient oil
Bevel gears maladjusted
Converter Operation Faulty:
Belt slipping:
Belt dirty, worn, or wetted
Drive or driven pulley sheave dirty or worn
Drive pulley spring broken or weak
Converter engagement speed too low:
Drive pulley spring broken or weak.
Converter engagement speed too high:
Belt drive or worn
Drive or driven pulley sheave dirty worn.
Drive pulley weight doesn't move smoothly.
Drive pulley movable sheave doesn't move
smoothly
Drive or driven pulley movable sheave bush worn
Drive pulley weight or roller worn.
Shifting too quickly:
Drive pulley spring weak
Driven pulley spring weak or incorrectly installed
(too loose)
Shifting too slowly:
Belt dirty or worn
Drive or driven pulley sheave dirty or worn
D rive pulley weight doesn't move smoothly.
Drive pulley movable sheave doesn't move
smoothly
Driven pulley spring incorrectly installed (too tight)
Drive pulley movable sheave doesn't move
smoothly
Gear Shifting Faulty:
Doesn't go into gear:
Shift arm bent or seized
Gear stuck on the shaft
Shift tie-rod maladjusted
Shift tie-rod damaged
Jumps out of gear:
Shifter groove worn
Gear dogs worn
Shift block worn
Shift arm positioning bolt spring weak or broken
Shift tie-rod maladjusted
Drive shaft, output shaft, and/or gear worn
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