general information - Martin Nez

ENGINE 3-51CRANKCASEGEARSHIFT FORK AND GEARSHIFT CAMRemoval• Remove the gearshift cam bearing retainer screws 1 andgearshift fork shaft retainer 2 from the lower crankcase.• Remove the gearshift fork shafts 3 and gearshift 4 forksfrom the lower crankcase.• Remove the gearshift cam 5 and its bearing 6.GEARSHIFT FORK-TO-GROOVE CLEARANCE• Using a thickness gauge, check the gearshift fork clearance inthe groove of its gear.• The clearance for each gearshift fork plays an important rolein the smoothness and positiveness of the shifting action. Shift fork-to-groove clearance:Service Limit: 0.5 mm 09900-20803: Thickness gauge• If the clearance checked is noted to exceed the limit specified,replace the fork or its gear, or both.GEARSHIFT FORK GROOVE WIDTH• Measure the gearshift fork groove width using the vernier calipers. Shift fork groove width:Standard: 5.0 – 5.1 mm 09900-20102: Vernier calipers