Hugh :
4 ATDC is the timing reference for US-spec TR6 (with the vacuum retard
active).
I would guess the 2 degree offset is because the rubber ring has shifted
slightly or perhaps just taken a 'set'.
Randall
> I have seen statments like "If you trust your TDC mark" on the
> lists. So, I
> checked TDC on my crank pulley and discovered that it occurs when the
> pointer is at 2 BTDC. I also see a slot cut into the mark at 4 deg ATDC. I
> have a new crank. I assume that someone, maybe the factory, calibrated the
> pulley to the old crank at 4 deg ATDC and that is what the slot is for.
>
> Anyone have insights on this?
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