Starter clutch gear compatible with motorcycle models SRX400, XT400E, XT500E, SZR660, MT03, XT600E, TT600E, 660 X, R, Z.Part numbers 3YF-15515-00 and 3TB-15515-00.Designed for use in engine starting systems to engage the starter motor with the crankshaft.construction for performance in specified applications. Compatibility Note: This is a third-party part.All brand/model references are for fitment purposes only.