Poor Performance At Low And Idle Speed - Honda 2000 XR50R Service Manual

TROUBLESHOOTING
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Possible cause
11. Check for engine overheating - - - - - Overhe ating - - - - - - - - ••. Excessive carbon build-up in combus-
1
tion chamber
Not overheating . Use of poor quality fuel
· Clutch s lipping
· Lean fuel mixture
· Wrong type of fuel
12.Accelerate or run at high speed - - - - - Engine knocks ------~.~ . Worn piston and cyl inder
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.
Wrong type of fuel
• Excessive carbon build-up in combus-
En
j
9
ine does not knock .
:~On~t~~~m~~ing
to advanced (faulty
ignition control module)
· l ean
fuel
mixture
POOR PERFORMANCE AT LOW AND IDLE SPEED
,. Check carburetor air screw
adjustment
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Correct
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Possible cause
- - - - - - Incorrect - - - - - - - - - - . . See section 5
2. Check for leaking intake pipe - -- - - -
leaking
---------~.~
. loose
carburetor mounting bolts
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Damaged insulator
Not leak
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3. Perform spark test - - - - - - - - - - Weak or intermittent
----~.~
. Faulty or foul ed spark plug
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spark • Faulty ignition control module
Good spark . Faulty ignition coi l
· Broken o r shorted spark plug wire
· Faulty engine st op switch or ignition
switch
· Faulty ignition pulse generator
· l oose or disconnected ignition system
wires
4. Check ignition timing-- - - - -- - - Incorrect - - - - - - - - -- • . Improper ignition timing (faulty ignition
control module)
16-3