Yes, but not necessarily on the compression stroke, which is what matters. The motor is at top dead centre on Number 1 or Number 4 cylinder when the first of the two close notches is in line with the timing pointer. If the magneto is already fitted and approximately correctly timed, you will know if you are at TDC for Number 1 cylinder, because the contact on the rotor disc will be pointing at the lead in the distributor cap for Number 1 cylinder. If not, rotate the motor through 360 degrees.
If the magneto has been removed, then you need to check which cylinder is on the compression stroke by other means. The book recommends removing Number 1 spark plug and cranking the engine (you need two people for this) until pressure is felt. This shows Number 1 is on the compression stroke. Otherwise, remove the rocker cover and check that both valves are closed on Number 1 cylinder at TDC.
If you crank the engine, you should ground the magneto to avoid accidental starting or a nasty electric shock from one of the HT leads.
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