HYOSUNG GD250 Owner's Manual page 6

Noise Control System (muffler assembly)
TAMPERING WITH NOISE CONTROL SYSTEM PROHIBITED
Owners are warned that the law may prohibit :
(a) Th e removal or rendering inoperative by any person other than for the
purpose of maintenance, repair or replacement, of any device or
element of design incorporated into any new vehicle for the purpose of
noise control prior to its any sale or delivery to the ultimate purchaser
or while it is in use ; and
(b) Th e use of the vehicle after such device or element of design has been
removed or rendered inoperative by any person.
MAINTENANCE :
The exhaust system of this motorcycle requires no periodic maintenance.
Th e engine should be adjusted to the manufacture' s specifications and
the spark plug should be kept in good condition. Running the engine with
incorrectly operating spark plug or misadjusted fuel injection system may
cause permanent damage to the catalyst and to the noise control system.
WARNING
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