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In the engine oil tank, feeding the Pilgrim Pump, you want a good quality two-stroke oil, preferably of 40 grade viscosity. Millers, Silkolene-Fuchs, and other firms do them, and you do NOT want the type for petroil lubricated two-strokes (“premix”). You need the type for bikes with pumped oiling. Do not use a multi-grade type oil.
In the gearbox you want a 140 grade ‘straight’ gear oil, NOT one with hypoid additives. Do not overfill the gearbox. With the bike off its stand, just add oil until it just starts to come out of the oil-level hole, no more.
If the bike has been standing for years, slacken off the feed union on the underside of the pump until you see oil leaking out, then retighten the union. Also remove the ‘window frame’ from the top of the pump, and half fill each side with engine oil, to prime it, before trying to start the engine.
With FRESH petrol in a CLEAN petrol tank, turn on the petrol, and then flood the carburettor by pressing down the ‘tickler’ button on top of the float chamber, until petrol pees out of the breather hole. Close the air lever so that the air slide bottoms in the carburettor, then turn on the ignition switch, (I will assume that you have fully charged the battery !). Next kick the engine over ONCE with the throttle closed, to draw some air/fuel mixture into the engine. Then open the throttle about a quarter, and give a ‘brisk’ kick of the kickstart. In theory (!) your ‘Brum’ should now be running……
As soon as it starts check that the oil is dripping in BOTH sides of the pump, and if necessary adjust so that you have about eight full drips per minute in each side at a fast tickover engine speed. You should be able to open the air lever after less than a minute of running.
Do a quick check for petrol, oil, and coolant leaks before doing a test ride. Use about 30% antifreeze mix in the radiator, not just water.
This procedure should get you up and running, but be aware that a bike that has stood for years may well have problems with sediment in the carburettor and pipework, so make sure that everything is cleaned out before trying to start the bike. A fresh pair of spark-plugs may be a good idea….
I hope this helps. Enjoy your Scotting !