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What or who is BiLCheersDennis
Big bolt is the gearchange selector drum retaining bolt. It was used on early models to aid positive neutral selection. The one circled is one of the 6 bolt holes and uses a 6 x 100mm flanged bolt.
People seem to think that to replace the primary drive rubbers you need to remove the 3 large countersunk JIS screws but in actual fact you don't. As soon as you remove the circlip it will come apart.
Less than £50 for the Kawasaki one its change it anyway
92057-1011