Yamaha 2001 YZF-R6N Owner's Manual page 65

PERIODIC MAINTENANCE AND MINOR REPAIR
ECA00021
CAUTION:
@
Do not use any tools to remove or
install the spark plug cap, otherwise
the ignition coil coupler may get
damaged. The spark plug cap may
be difficult to remove because the
rubber seal on the end of the cap fits
tightly. To remove the spark plug
cap, simply twist it back and forth
while pulling it out; to install it, twist
it back and forth while pushing it in.
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