① Carburetor adjusts
wrongly
②Oil routine and air routine
have been blocked
③Oil surface in bobber
chamber is too high
Re-adjust idling screw
Wash oil routine and air
routine
Adjust oil surface in
bobber chamber
2. Idling speed is
not stable
①Blending air is too thin
②Clearance of spark plug is
too small
Adjust carburetor
Adjust to regulated value
3. Idling speed is
too high
①Air saving spring force of
carburetor is too small
②Intake pipe, exhaust pipe
and muffler have been
blocked
③Electrical wire tie-in for
electromagnetic thick adding
valve has not been Unblocked
①High-pressure wire or
ignition loop leaks electricity
②Ignition contacts badly
③There are too many
accumulated carbons between
electrodes of spark plug
④TCI has been burned or hit
Change
Unblock
Eliminate accumulated
carbon
Change
①Air valve clearance is
wrong
②Air valve seat has been
damaged
③Air valve spring has been
tired or broken
Adjust to regulated
clearance
Change
Change
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