| Diagram | Fig. 13 — INNER AND OUTER CHAINCASE · ref 23 |
| Subsystem | primary |
| Listed in parts books | 1969–1974 |
Screw – tachometer housing to crankcase (¼" UN.C X ¾")
A ¼ inch UNC, ¾ inch long screw used to secure the tachometer housing to the crankcase and other primary/crankcase hardware.
14-6605 is a small screw used to mount the tachometer housing (or drive-side hardware near it) to the crankcase. The catalog lists it as a ¼ inch UNC thread, ¾ inch long. It shows up across a spread of catalog figures - chaincase, crankcase/timing gears, primary covers, and the speedometer/tachometer section - which tells you this fastener size and thread got reused in several spots on the engine and primary side, not just one bolt hole.
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Because it turns up in so many different areas of the parts books, it's worth checking the specific location on your machine before ordering rather than assuming one screw covers every mounting point listed. The catalog data runs from 1969 to 1974, so it's associated with that stretch of unit-construction production, though the books don't tie this exact screw to one single model.
If you're missing one or a few off the primary or timing side hardware, this is a straightforward fastener to have on hand - nothing exotic about it, just make sure the length and thread match what's called out for your application.
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