Honda CB350 Repair Manual page 163

158 TROUBLESHOOTING
Engine Troubleshooting (cont.)
Problem Possible Causes Inspection/Remedy
Poor low—speed operation
Spark plug gap too great or
plugs too cold
Poor breaker point contact
Valves improperly adjusted
properly ]
Carburetor fault
Use correct heat range and gap to proper
specifications. See Chapter 3.
Clean or replace breaker points.
Adjust. See Chapter 3.
See below.
Poor high—speed operation Ignition timing too retarded
Spark plug gap too small
Plugs too cold
Carburetor diaphragm torn
Carburetor float level too low
Partially blocked fuel lines or
petcock
Dirty air cleaner
Weak breaker point arm spring
Defective ignition coils or con—
densers
Weakened valve springs
Incorrect valve timing
Adjust timing. Refer to Chapter 3.
Adjust gap. See Chapter 3.
Fit plugs of the correct heat range. See
Chapter 3.
Replace.
Adjust float level. See Chapter 3.
Clean.
Clean or replace element.
Replace points.
Replace.
Inspect springs. Refer to Chapter 4.
Reset. Refer to Chapter 4.
Loss of power
Incorrect valve adjustment
Clogged or dirty air cleaner
Incorrect ignition timing
Dirty carburetors
Valves not sealing
Valve springs weakened
Rings or cylinder worn
Valve timing incorrect
Carburetor float level incorrect
Spark plug gap incorrect
Engine or muffler carbon
choked
Exhaust pipe broken or loose
Adjust tappets. Refer to Chapter 3.
Clean or replace the element.
Adjust. Refer to Chapter 3.
Clean. See Chapter 6.
Lap valves. Refer to Chapter 4.
Replace. Refer to Chapter 4.
Refer to Chapter 4.
Refer to Chapter 4.
Adjust. Refer to Chapter 3.
Adjust. Refer to Chapter 3.
Decarbonize. See Chapter 4.
Secure or replace.
Engine overheats
Insufficient engine oil
Too lean a mixture
Timing too advanced
Oil pump defective; oil
sage blocked
pas—
Engine carbon choked
Top up.
See carburetor section below.
Adjust. Refer to Chapter 3.
Refer to Chapter 5.
Decarbonize. See Chapter 4.
Engine backfires or kick—
starter kicks back
Timing too advanced
Advance unit stuck
Adjust. Refer to Chapter 3.
Lubricate; check for free movement.
Popping at muffler after
shutting off throttle
Air leaks in muffler
Mixture too lean
Secure clamps or nuts.
Adjust idle circuit and float level.
Check for air leaks.