APRILIA SR 50 Workshop Manual page 7

INTRODUCTION
TEST = diagnostic check
T.B.E.I. = crowned-head Allen screw
T.C.E.I. = cheese-headed Allen screw
T.E. = hexagonal head
T.P. = flat head screw
TSI = Twin Spark Ignition
UPSIDE-DOWN = inverted fork legs
V = Volt
W = Watt
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SR 50