For anyone thats read this and thought WTF is shaun on about he refers to the timing marks on the bottom pulley.
There are 6 marks
From left to right:
5 ATDC, TDC, 5 BTDC, 10 BTDC, 15 BTDC, 20 BTDC
ATDC - After top dead centre
TDC - Top dead centre
BTDC - Before top dead centre
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