Troubleshooting; Engine - Suzuki RM250 Owner's Service Manual

3-1 TROUBLESHOOTING
TROUBLESHOOTING
ENGINE
Complaint
Possible Cause
Engine does not Fuel deterioration
start or hard to
No fuel flow to the carburetor
start
• Fuelcock clogged
• Fuel hose clogged
• Fuel tank cap breather hose clogged
• Carburetor float valve malfunction
Carburetor overflow pipe clogging
Carburetor air vent pipe clogging
Too rich air/ fuel mixture in combustion chamber
Incorrect ignition timing
No spark at spark plug
Low compression
• Piston ring worn or stuck
• Cylinder worn
• Air leak from cylinder gasket
• Air leak from crankshaft oil seal
Engine stalls
Fuel deterioration
Fouted spark plug
Fuel hose clogged
Air cleaner clogged
Carburetor jets clogged
low compression
• Piston ring worn or stuck
• Cylinder worn
• Air leak from cylinder gasket
• Air leak from crankshaft oil seat
Incorrect ignition timing
Carburetor fuel level maladjustment
Insufficient Fuel deterioration
power Brake dragging
Exhaust pipe cracked or clogged with carbon
Exhaust va lve maladjustment
Exhaust valve ca rbon deposits
Air cleaner element clogged
Carburetor jets clogged
Incorrect fuel level in carburetor
Incorrect spark plug gap
Cylinder or piston ring worn
Reed valve malfunction
Incorrect ignition timing
Remedy
Replace
Clean
Clean or replace
Clean
Replace
Clean
Clean
Scavange
Adjust
0 12-2
Replace
Replace
Replace
Replace
Replace
Clean or replace
Clean or replace
Clean or replace
Clean
Replace
Replace
Replace
Replace
Adjust
Adjust
Replace
Adjust
Replace or clean
Adjust
Clean
Clean or replace
Clean or replace
Adjust
Adjust or replace
Replace
Replace
Adjust