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A lot depends on how much use and /or abuse the machine has had. The G 49 and G 57 parts adjust how the G 66 AS lever assembly move up and down overall. These parts sometimes come loose on account of the 2 327 bolts coming loose for whatever reason, but the design is a bit weak, the small hex on the top of the G 57 tends to sink into the soft alloy of the G 49 and this makes adjustment difficult. The ratchet G 43 and the G 59 AS change speed pawl get wear on the teeth, thus limiting the amount of available travel. Even excessive play in the bush in the kick start cover can allow too much play at the G 66 lever. It does not take too much for the travel to suffer resulting in poor shifting. Having said all that, the parts do last an awful long time in service.