Poor Performance At Low And Idle Speed; Poor Performance At High Speed - Honda 1985 CBX750F Workshop Manual

~HONDA
TROUBLESHOOTING
~
CBX750F
POOR PERFORMANCE AT lOW AND IDLE SPEED
POSSIBLE CAUSE
1. Check ignition timing and
INCORRECT-----------1..
~
0)
Improper ignition timing
camshaft
(Faulty spark unit or pulse
generator)
CORRECT
(2) Faulty camshaft journal
+
2. Check carburetor pilot screw INCORRECT-----'..
~See
Fuel System Section
adjustment
CORRECT
+ .
3. Check for leaking intake pipe
LEAKING - - - - - - - - - - - - 1..
~
(1) Deteriorated insulator O-ring
(2) Loose carburetor
NO LEAKS
+
4. Perform spark test
WEAK OR
INTERMITTENT----~
Faulty, or fouled ... (1) carbon wet ­
SPARK spark plug
GOOD SPARK
(2) Faulty spark unit
(3) Faulty ignition coil
(4) Faulty pulse generator
POOR PERFORMANCE AT HIGH SPEED
INCORRECT
- - - - - - - - - - 1.....
(1)
. .
Faulty spark unit
(2) Faulty pulse generator
CORRECT
.
~
2. Disconnect fuel tube at
FUELFLOWRESTRICTED---- .. (1) Lack of fuel in tank
carburetor
(2) Clogged fuel line
(3) Clogged fuel tank breather hole
FUEL FLOWS FREELY
l
(4) Clogged fuel valve
3. Remove carburetor and check
CLOGGED
----------~~
(1) Clean
for clogged jet
NOT CLOGGED
+
4: Check valve timing
INCOR RECT
- - - - - - - - - - 1.....
(1) Cam sprocket not installed
properly
CORRECT
~
5. Check valve spring tension
WEAK
-----------_~
Faulty spring ... (1)
NOT WEAKENED
21-3