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The head cavity where the tensioner locates may need some slight grinding so the tensioner does not drag on the rivets : see example below.
The KA1 tensioner completely replaces the roller system. The only original parts you will use with it are shown here:
Some grinding or milling of material in the head cavity in the area shown is needed so the new KA tensioner will pivot without dragging. The tensioner needs to pivot smoothly after assembly so that the cam chain gets the correct tension.