Service manual

Page 148 of 151
18.2 POOR PERFORMANCE AT LOW AND IDLE SPEEDS
• Check ignition timing
o Faulty CDI or A/C generator
• Check carburetor air screw adjustment
o Improperly adjusted air screw
• Check for leaking intake pipe
o Deteriorated insulator o-ring
o Loose carburetor
• Spark test – weak or intermittent spark
o Loose or disconnected ignition system wires
o Faulty, carbon fouled, or water fouled spark plug
o Faulty A/C generator
o Faulty CDI unit
o Faulty ignition switch
o Faulty ignition coil
o Faulty pulse generator
o Broken or shorted spark plug wire
o Faulty engine stop switch
18.3 POOR PERFORMANCE AT HIGH SPEED
• Check ignition timing
o Faulty CDI unit
o Faulty A/C generator
• Carburetor fuel flow restricted in tube
o Lack of fuel in tank
o Clogged fuel line
o Clogged fuel valve
o Logged fuel tank breather hole
• Remove carburetor and check for clogged jets
o Clean with high pressure air gun
• Check air cleaner filter element
o Clean filter element if dirty
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