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...chain, but instead it is normally caused by slack in the [[balance shaft]] chain. ...n IIs. Later Astron IIs can be adjusted but due to the [[self adjusting bs chain|self-adjusting mechanism]] the source of the slackness should be investigat

...tension.jpg|right|thumb|200px|Figure 1: Self-adjustment mechanism on newer Astron II engines]] [[Image:1g_cbchain.jpg|right|thumb|200px|Figure 2: Old lower chain guide]]