User Guide

1. GENERAL INFORMATION
1-23
POOR PERFORMANCE (ESPECIALLY AT IDLE AND LOW SPEEDS)
Faulty CDI unit
Faulty pulser coil
Mixture too rich (turn screw
out)
Mixture too lean (turn screw
in)
Deteriorated O-ring
Carburetor not securely
tightened
Damaged insulator rubber
Broken vacuum tube
Faulty or fouled spark plug
Faulty CDI unit
Faulty A.C. generator
Faulty ignition coil
Broken or shorted spark plug
wire
Faulty ignition switch
Faulty air cut-off valve
Damaged vacuum tube
Clogged or damaged air vent
hole
Remove spark plug
and install it into
spark plug cap to test
spark by connecting it
to engine ground
Inspection/Adjustment
Symptom
Probable Cause
Check ignition timing
Check air cut-off
valve
Check carburetor
gasket for air leaks
Check carburetor pilot
screw adjustment
Correct timing
Incorrect timing
Correctly adjusted
No air leak
Air leaks
Good spark
Weak or inter-
mittent spark
Good
Faulty
Incorrectly
adjusted