A member of my XJS Facebook Group Richard Patterson also discovered replacment subs available as Harley Parts. — Which are also “Drag Specialties” bike parts and… look like direct rebrands of what are Standard Motor Products Parts (which are the cheapest being as low as in the high $40 range as of early 2022). So… for the archives… although some of this is documented over in another thread here:
Known part numbers & HG values:
Vacuum Operated Electrical Switch (VOES) - 2101-0011 6"HG
Vacuum Operated Electrical Switch (VOES) - 2101-0010 5"HG
Vacuum Operated Electrical Switch (VOES) - 2101-0009 4"HG
Vacuum Operated Electrical Switch (VOES) - 2101-0007 3"HG
Vacuum Operated Electrical Switch (VOES) - 2101-0006 OEM # 26566-91
Vacuum Operated Electrical Switch (VOES) - 2101-0005 OEM # 26557-83
Vacuum Operated Electrical Switch (VOES) - 2101-0004 OEM # 26558-84
Standard Motor Products MCVOS7 = 6" HG
Standard Motor Products MCVOS6 = 5" HG
Standard Motor Products MCVOS5 = 4" HG
Standard Motor Products MCVOS4 = 3" HG
Standard Motor Products MCVOS3 = OEM # 26566-91
Standard Motor Products MCVOS2 = OEM # 26557-83
Standard Motor Products MCVOS1 = OEM # 26558-87&84
The OE Harley #s don’t give the “HG at which they activate, but perhaps a Harley Owner will eventually cross these PNs and look in the manual and tell us if one of those gets us down to the 2” of HG response range or closer to WOT/Atmospheric pressure. But with the 3" or more it just means that enrichment happens sooner.
~Paul K.