| Also known as | H2237 |
| Diagram | Fig. 27 — IGNITION COILS, HORN, RECTIFIER AND ZENER DIODE · ref 22 |
| Subsystem | electrical |
| Listed in parts books | 1968–1974 |
Heat sink
The finned metal heat sink that mounts the zener diode in the charging circuit, PN 97-2237.
This is the heat sink that mounts the zener diode in the charging system, listed in the parts books as PN 97-2237 (also shown as H2237 in the older lettered form). It shows up in the electrical figures alongside the ignition coils, horn, and rectifier, since that's where the zener diode lives on these machines.
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A zener diode sheds excess charging current as heat, and it needs a finned metal sink to carry that heat away so it doesn't cook itself. This part is that sink - it bolts up as the mounting point and heat-dissipating body for the diode itself.
It turns up across a wide span of catalog entries from 1968 into 1974, and also appears listed under front fork figures in our records, which is likely just where the parts books grouped the electrical hardware on certain diagrams rather than any mechanical connection to the forks. Call the shop if you want us to confirm exactly which diagram applies to your bike before you order.
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