ENGINE 3-57 GEARSHIFT FORK THICKNESS • Measure the gearshift fork thickness using the vernier cali- pers. Shift fork thickness: Standard: 4.8 – 4.9 mm (0.189 – 0.193 in) 09900-20102: Vernier calipers GEARSHIFT CAM BEARING AND GEARSHIFT SHAFT BEARING Bearing inspection • Inspect the gearshift cam bearing for abnormal noise and smooth rotation. • Replace the bearings if there is anything unusual. • Inspect the gearshift cam bearing 1, gearshift shaft bearings E 2 and 3 for abnormal noise and smooth rotation while they are in the crankcase. L • Replace a bearing if there is anything unusual. P M A Bearing removal S • Remove the gearshift shaft bearing with the special tools. 09921-20210: Bearing remover 09930-30104: Sliding shaft • Remove the gearshift cam bearing with the special tools. 09923-74511: Bearing remover 09930-30104: Sliding shaft  Be careful not to lean the bearing remover.