EC­CEN­TRIC ROCK­ERS

Classic Bike (UK) - - News -

Valve clear­ance ad­just­ment by ro­tat­ing ec­cen­tric rocker spin­dles was seen on NSU and Ve­lo­cette en­gines in the 1930s be­fore its adop­tion on the AJS 7R. It makes ad­just­ment eas­ier; it is car­ried out here by re­leas­ing lock­ing tabs and us­ing a sim­ple tool that fits notches on the ends of the spin­dles. The sys­tem also avoids the un­de­sir­able re­cip­ro­cat­ing weight of ad­justers on rock­ers or tap­pets, al­low­ing higher rpm with­out valve float and re­duc­ing stress in the valve gear.

Ro­tat­ing the spin­dle ad­justs valve clear­ance

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