Honda CB350 Repair Manual page 162

TROUBLESHOOTING 15
Engine Troubleshooting (cont.)
Problem Possible Causes
Inspection/Remedy
Engine idles poorly
Spark plugs worn, dirty, or gap
too wide
Spark plugs too cold
Breaker point gaps incorrect
Ignition timing incorrect
Valves improperly adjusted
Water in carburetors
Carburetor float levels wrong
Air leaks at manifolds
Leaking valves
Worn valves, valve guides,
valve seats
Weak spark
Petcock clogged
Float bowl fuel level too low
Clean or replace and gap plugs.
Fit the proper heat range plugs.
Adjust.
Adjust.
Adjust.
See Chapter 3.
Refer to Chapter 3.
See Chapter 3.
Drain float bowls and gas tank if neces—
sary and fill with fresh gas.
Adjust. Refer to Chapter 3.
Determine cause and rectify.
Lap valves. See Chapter 4.
Check valve train. See Chapter 4.
Check coils and condensers.
Clean.
Check float height. Refer to Chapter 3.
Engine misfires when ac—
celerating
Loose or intermittent connec—
tions in the ignition circuit
Ignition timing incorrect
Gas tank cap vent clogged
Water in float bowls
Carburetor main jet clogged
Ripped carburetor diaphragm
Air
folds
Defective ignition coils or con—
densers
leaks at carburetor mani—
Carburetor settings wrong
Very low or dead battery
Check all connections; make that
they are clean and tight.
sure
Adjust. Refer to Chapter 3
Clear.
Drain and refill with fresh mixture.
Remove and clean.
Replace.
Determine cause and remedy.
Replace.
Take plug
necessary.
readings and rejet carbs if
Recharge or replace battery.
Engine surges or runs un—
evenly at steady throttle
openings
Carburetor fault; mixture too
lean, erratic fuel flow
Air leaks at carburetor mani—
folds
Valves improperly adjusted
Remove and carburetors;
Chapter 6.
inspect see
Determine cause and remedy.
Adjust. Refer to Chapter 3.
Engine breaks up or mis—
fires while running
Battery very low or dead
Loose or intermittent connec—
tions in the ignition circuit
Battery terminal come adrift
Recharge or replace battery. See Chap—
ter 2.
Check and secure connections.
Clean and secure battery connections.
Poor low—speed operation Incorrect ignition timing
Carburetor idle circuit poorly
adjusted
Adjust timing. Refer to Chapter 3.
Adjust pilot screws and idle speed. See
3
Chapter 3.