How Motorcycles

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shift drum and forks detent arms hold shift drum in one rotated position thereby keeping the transmission in a specific gear star shaped detent on the end of the shift drum spring force pivot point neutral that half-click between first and second gear first gear hole for shift fork shaft fork slides on shaft ghost view of shift fork shaft shift fork tab pin fits into groove as the shift drum rotates the pin on the shift fork is moved by the groove on the shift drum the shift fork slides on the shift fork shaft as the shift fork slides the tabs push laterally side to side on grooves machined into sliding gears in the transmission gear 3d view side view shift fork tabs fit in here