| Also known as | E10070 |
| Diagram | Fig. 5 — CYLINDER BLOCK AND HEAD TR7RV · ref 49 |
| Subsystem | engine top |
| Listed in parts books | 1970–1974, 1976–1980, 1985 |
BALL PIN, 650 ROCKER ARM
Ball pin for the 650 rocker arm assembly, used across cylinder head and rocker box builds on the unit twins.
This is the ball pin that seats in the rocker arm up in the cylinder head, part number 71-0070, also cataloged under E10070. It shows up across the cylinder head and rocker box figures for the unit-construction 650 twins, including TR6R, TR6C, T120R, and later T140V and TR7RV listings, so it covers a wide span of years in the parts books.
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The ball pin is the pivot point the rocker arm bears against on the adjuster end, taking the up-and-down motion from the pushrod side and translating it to valve movement. It is a small, hard-wearing piece, but it is also one that gets overlooked when someone is going through a head and only replacing the obvious wear items like rockers and bushes.
Given how many different head and rocker box figures this part number turns up in, it is worth double-checking against your own parts book or bringing the old one in before you order, just to be sure the ball pin you have matches what is called for on your engine.
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