You could probably replace all 8 tappets/followers in about half an hour
As for the tickover...... the auto choke is the most likly culprit, Pierburgs get a bad wrap as beeing crap carbs. the carb is fine but the auto-choke can be troublesome..
I think when I had my 1.8CVH I went through all 8 followers, an exhaust manifold, spring set, and 3 head gaskets ( 1 to rule out the head gasket, 1 to swap the springs and 1 to replace the snapped head bolt that occurred during replacing the springs... )
TT
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