Details
| Diagram | Fig. 1 — CYLINDER AND CRANKSHAFT · ref 55 |
| Subsystem | engine bottom |
| Listed in parts books | 1968–1971 |
BSA "Tufnol" spacer, carburetter flange
Tufnol carburetor flange spacer, part number 70-7820, used as a heat-insulating block between head and carb.
PN · 70-7820
This is a Tufnol spacer that sits at the carburetor flange, part number 70-7820. Tufnol is a phenolic-resin laminate, and its main virtue in this spot is that it doesn't conduct heat the way metal does, so it works as an insulating block between the cylinder head and the carburetor body.
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