| Diagram | Fig. 7 — CLUTCH · ref 27 |
| Subsystem | primary |
| Listed in parts books | 1969 |
BSA Primary chain (70 pitch)
A 70-pitch primary drive chain listed in the clutch figure, part number 19-8613.
This is a primary chain listed under part number 19-8613, called out as a 70-pitch chain in the catalog. It sits in the primary drive, the enclosed section between the engine and the gearbox where power gets carried to the clutch. The one catalog appearance we have on file ties it to the CLUTCH figure, which is where you'd expect a primary chain to show up.
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Our record on this one is thin - a single figure listing from 1969 and nothing more to go on for exact model fitment. Before you order, it's worth double-checking pitch count and length against what's currently in your primary chest, since primary chains vary by application even within the same general family of bikes.
Give the shop a call if you want help confirming this is the right one for what you're working on - we'd rather get you the correct chain the first time than have you pull the primary cover twice.
We've never carried this one. Tell us what you're after and we'll go looking — you'll get a price and photos before you commit to anything.
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