Hey All.
Been quite a while but finally getting the old 1966 Lightning back together & ready for Carbs. From all I've read & researched I'll go with the AMAL 930 Premier Concentrics.
Was reading another thread here about carb set up & got me thinking which size slider to order them with. I take it the 3 inch is for sea level & keeps it a bit richer.
I'm in Wyoming at about 5100 feet or more & plan to ride up into the hills quite often so I think the 21/2 inch is the better choice for altitude.
Any feedback & tips is much appreciated.

'66 Lightning Engine, '68 Mark IV frame "bitsa"