Oil Tap with Cutout Switch

Andy Marks
Dec 22, 2025
2 min read

Our combined oil tap and switch which prevents wet sumping and can be connected to bikes with magneto or coil ignition. This ensures that, if the oil tap is 'off', the switch will stop any sparks and the engine cannot be started until the oil is switched on.

£45.00

Buy Now

Included with every tap we sell is a comprehensive instruction sheet. If you have misplaced yours or would like to take a look at how to fit one before buying, please read on. If you would like to download a copy to print out and use in the workshop, you can do so by clicking on the link at the bottom of this page.

Wiring the Oil Switch for use with Magneto Ignition System

Terminal A: not used

Terminal B: not normally used (but see note below)

Terminal C: add a new wire (shown in blue) to the magneto’s cut out terminal

Note: The other side of the Switch is Terminal B which is connected internally to the body of the Tap itself. This means that the necessary connection to earth is achieved automatically when the Tap is screwed into either the oil tank or the crankcase as required. However, if the oil tank is rubber mounted or if the Tap is fitted to rubber oil pipe on both sides, it will be necessary to add a new wire (shown in grey) from Terminal B to a good earth connection on the frame or the engine.

Wiring the Oil Switch for use with Battery/Coil Ignition System

Find the original wire fitted between battery/ignition switch and the HT coil (shown in dotted black) and then remove it.

Terminal A: add a new wire (shown in red) from battery/ignition switch to terminal A on the Oil Tap with Cut Out Switch

Terminal B: not used

Terminal C: add a new wire (shown in green) from Terminal C on the Oil Tap with Cut Out Switch to the HT coil

CAUTION: When used with battery/coil ignition systems, connections to Terminals A and C MUST be made as shown. DO NOT SWAP THEM OVER!

When the oil is turned off, terminal C is connected to terminal B (which is internally earthed) and so this would result in a dead short!

CAUTION: If dismantling the Oil Tap with Cutout Switch

There is a very small spring trapped between the nylon housing and the tap. Take care not to lose it!
If removing the handle, refit the screw with Loctite

Download

We hope you found this useful - please click on the file below to download a PDF copy for your own records.

Oil Tap Fittings

We sell a range of parts to help you with fitting the oil taps to your bike. These are all available in our online shop. Please click on the link below to take a look