| Diagram | Fig. 1 — CYLINDER HEAD, EXHAUST PIPE · ref 27 |
| Subsystem | engine top |
| Listed in parts books | 1969–1970 |
BSA Cylinder head dowel stud
A cylinder head dowel stud from the CYLINDER HEAD and EXHAUST PIPE areas of the parts book, part number 40-0124.
This is a cylinder head dowel stud, listed in the shop's records under part number 40-0124. It shows up in the CYLINDER HEAD and EXHAUST PIPE sections of the parts books, which tells us it's involved in securing the head down and likely lines up with where the exhaust pipe clamps to the head as well.
Read more
A dowel stud like this does double duty compared to a plain stud - the dowel portion helps locate the head precisely on the barrel while the threaded end takes a nut to clamp it down. Beyond that, our catalog entry on this one is brief, so we don't have more detail on dimensions or thread spec to pass along.
The manufacturer tag on this part points to BSA, but the description alone doesn't tell us which specific model or engine it belongs to. Give the shop a call and we'll confirm fitment before you order.
Sorry if we got something wrong here. If you think this information isn't correct, .