Details
| Diagram | Fig. 2 — Engine: Cylinder, Cylinder Head and Fittings · ref 5 |
| Subsystem | engine top |
| Listed in parts books | 1971–1972 |
Norton Valve Guide Exhaust
Exhaust valve guide for the cylinder head, part number NMT2011.
PN · NMT2011
NMT2011 is an exhaust valve guide, the part that seats in the cylinder head and controls the exhaust valve stem as it moves up and down. It keeps the valve tracking straight so it seals properly against the seat every time it closes, and it's a wear item — years of heat cycling and valve movement will eventually open up the clearance inside the guide.
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