Troubleshooting - Honda CR85 2006 Owner's Manual

The items that are serviceable using this Manual are
followed by the page number reference in parenthesis. The
items that require use of the Honda Service Manual are
followed by an asterisk.
Poor performance at low and idle speeds
CHECK
1. Check ignition
INCORRECT
timing*
CORRECT
2. Check carburetor
INCORRECT
air screw
adjustment (P. 91)
CORRECT
3. Check if air
INCORRECT
cleaner is
overoiled (P.40)
CORRECT
4. Check if the
LEAKING
insulator is
leaking*
NOT LEAKING
5. Try spark test
WEAK OR
INTERMITTENT
GOOD SPARK
SPARK
Poor performance at high speed
CHECK
1. Check ignition
timing*
POSSIBLE CAUSES
• Faulty ignition control
2. Disconnect fuel
module*
line at carburetor
• Faulty alternator*
and check for
• Faulty ignition pulse
clogging (P. 35)
generator
• Fuel-air mixture too
lean (Turn the air
screw in) (P. 91)
• Fuel-air mixture too
3. Remove air
rich (Turn the air
cleaner (P. 40)
screw out) (P. 91)
• Over-oiled air clean-
er.
4. Check carburetor
jets for clogging
• Deteriorated reed
valve gasket
5. Install a larger
• Loose caburetor*
carburetor main
jet (P. 89)
• Faulty, carbon or wet
fouled spark plug (P. 94)
• Faulty ignition control
module*
• Faulty alternator*
• Faulty ignition coil*
• Broken or shorted
spark plug wire
INCORRECT
CORRECT
FUEL FLOW
RESTRICTED
UNRESTRICTED
FUEL FLOW
DIRTY
AIR FILTER
NOT DIRTY
CLOGGED
NOT CLOGGED
CONDITION
WORSE

Troubleshooting

POSSIBLE CAUSES
• Faulty alternator*
• Faulty ignition control
module*
• Faulty ignition pulse
generator*
• Lack of fuel in tank (P. 35)
• Clogged fuel line (P. 35)
• Clogged fuel fill cap
breather tube (P. 35)
• Clogged fuel valve (P. 35)
• Clogged fuel filter (P. 35)
• Not cleaned
frequently enough
(P. 40)
• Contaminants in the
fuel
• Jet size wrong, reject
in the opposite
direction (P. 89)
103 103
Tips Tips