Suzuki GSX1300BK Owner's Manual page 41

M letter display come on to notify preset
maintenance timing. Positive "M" mark and
negative "M" mark comes on alternately
when maintenance interval meter comes
zero. Reset the display to turn off the "M"
mark.
To reset the maintenance interval:
1. Turn off the ignition switch.
2. Push SET switch and turn on the ignition
switch. Wait 3 seconds until the display
repeats positive "R" mark and negative
"R" mark 3 times and goes off.
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