| Diagram | Fig. 28 — GAS TANK AND TWINSEAT · ref 21 |
| Subsystem | fuel |
| Listed in parts books | 1975–1979 |
FUEL TAP WITH POSITION FLAG (Reserve tap No Internal Tube) - 1/4 BRITISH PIPE THREAD 19 THREADS/INCH (1/2 INCH OD) Made in UK
UK-made reserve fuel tap with position flag, no internal standpipe, 1/4 BSP thread 19 TPI.
This is the reserve fuel tap, 60-4512, a petcock with a position flag so you can see at a glance whether it's set to run or reserve. It's the reserve-side unit, not the main tap, and it has no internal standpipe, which is exactly how a reserve tap is meant to work — it draws from lower in the tank once the main supply runs dry. The catalog places it in the gas tank and twinseat figure, and it shows up in records spanning 1976 to 1979.
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The threaded fitting is 1/4 British Pipe Thread, 19 threads per inch, with a 1/2 inch OD, and the tap is UK made. Because it's a straight BSP-threaded fitting, it isn't tied to one specific tank design — the thread spec is what matters for fitment, not the badge on the tank.
The main tap that pairs with this one is a separate part, so if you're replacing the reserve side, check whether the main tap on your bike needs attention too. Confirm your tank's threaded bosses match this BSP spec before ordering.
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