The lift is effected by cams acting on the under surface of tappets, and formed by cylindrical boxes keyed on to the stems of the lifter about onefourth of their length from the top. As, however, the cams, unlike those of European stamp mills, are placed to one side of the stamp, the latter is not only lifted but turned partly round on its own axis, whereby the shoes are worn down uniformly.
The principle of chain-driven camshafts below the valve plane and the operation of valves by means of tappets and rocker arms has been maintained.
Low maintenance requirements are met by the incorporation of hydraulic tappets, automatic timing belt tensioners and longlife spark plugs.
Self adjusting hydraulic tappets made quiet trouble free running for thousands of miles.
The exhaust was in one piece, the timing was OK, we even took the valve covers off and checked the tappets.