Details
| Diagram | Fig. 2 — Engine: Cylinder, Cylinder Head and Fittings · ref 12 |
| Subsystem | engine top |
| Listed in parts books | 1971–1972 |
Norton Valve Spring Inner
Inner valve spring for the cylinder head, paired with the outer spring on each valve.
PN · NM.22839
NM.22839 is the inner valve spring, part of the two-spring setup used on the cylinder head. It sits inside the outer spring on the valve stem, working together with it to keep the valve seated and to control valve motion as the cam opens and closes it.
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