there was a sort of id thing ages ago here yes , i think the only guru left here will need to see a side shot too though , some had a chamfer if i remember correctly and i see some there yes but a side shot too if poss' ? i'm sure the twin did have a different jet
The one on the right is a early to mid 90's 160, one of them ones with a single circle is a 125 jet, I have seen whats technically marked as a 125 jet in late model powertorques from new. My manuals only have reference to the 160 and 125 jets, the 2 or 3 lines could have been from a twin or lightweight, unfortunately mine have been bastardised at one point or another and probably couldnt be a reliable source for the correct info.
2 rings = 39-40m/l per min , 1 ring = 125cc & 85cc 43-45m/l per min, plain face = 160cc & 170cc 45-47m/l per min, 4 ring = 40 - 42m/l per min , I read somewhere that the VSX 160 cc had 25 percent more Torque with the larger intake snorkel and straight carb manifold and the ones I've seen have the 2 ring jet.
If you can't find one, then it's probably no longer available.
last time I looked 2 rings = 39-40m/l per min and plain face = 160cc & 170cc 45-47m/l per min or equivalents are available.
If you want a 4 ring = 40 - 42m/l per min buy the one closest 2 rings = 39-40m/l per min and if it runs slightly lean file the jet out with an oxy tip cleaner.
Part numbers, 7a 2 rings CR03655A / 7b 4 rings CR03685A / 7C 1 ring CR03696A / 7D plane face CR03522A