The Camshaft(s)/tensioner assembly is constructed from several parts from which the Camshaft-valve,exhaus is the most expensive.
The most reasonably priced component used on the En450a1 Ltd450 1985 Europe Fr Uk Fg It Nr / Liquid Cooled Camshaft(s)/tensioner is the Ring-o.
Some items from this specific schematic: Pin-dowel, Guide-chain,fr, Ring-o, Camshaft-valve,intake.