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Looking at the Haynes manual the EZL ignition has a trim pot with 7 postions which you mention, this can be tweaked to suit different fuel grades. However in Europe 95RON is minimum standard as far as I know so changing the trim would be pointless, maybe if you used RON97 "super-unleaded"
you could get more power but I doubt the difference would be noticeable.
The S and N markers should be on the trim plug
info from manual -
3200 rpm/vacume applied/trim plug in S position - 35-39 degrees BTDC
3200 rpm/vacume applied/trim plug in N position - 35-39 degrees BTDC
3200 rpm/no vacume applied/trim plug in S position - 23-27 degrees BTDC
3200 rpm/no vacume applied/trim plug in N position - 17-21 degrees BTDC
I dunno what any of that means!
Mike.
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