| Diagram | Fig. 32 — IGNITION CAPACITOR AND T100C HEADLAMP · ref 1 |
| Subsystem | electrical |
| Listed in parts books | 1969, 1975 |
| Also fits (as replacement) | 1968, 1970–1973 · for 54170009 |
Norton Ignition capacitor (type 2MC) (54170009)
Type 2MC ignition capacitor, PN 99-0737, for the contact breaker ignition circuit.
This is the ignition capacitor, catalog type 2MC, part number 99-0737. It shows up in the catalog under the ignition capacitor listings and also appears alongside the T100C headlamp figure, so it lives in the basic electrical equipment on the bike.
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A capacitor like this sits in the ignition circuit and works alongside the points and coil to keep the contact breaker from arcing as it opens and closes. Over time a worn capacitor is a common cause of hard starting or a weak, inconsistent spark even when the points themselves look fine.
Our records show this part carries the older factory number 54170009 as well, so if your parts book lists that number, it's the same physical piece. The catalog entries we have span from the late 1960s through the mid 1970s, but we don't have enough here to pin it to one specific model - check your bike's electrics against this before ordering, or give us a call.
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