Rebuilding all carbs on this 1976 CB550 Four , with rebuild kits and several soak and clean cycles. Ready to reassemble.
I have found no specification anywhere for clip placement, but the specs I found via this forum suggest that there are only 4 total clip positions
All of the existing needle clips are set in the 4th groove down from the top of the needle (the blunt end) But there is one more groove below for a total of 5. The replacement kit has the same 5 grooves, came with 38/100 jets, which matches the existing jets but the needle is a bit thicker (.051mm old vs. .058mm new, at the tip just at the start of the final bevel). The original jets were marked 272304 and there is no marking on the replacements gotten on Ebay.
So I take it that the existing jets were set one groove to the 'rich' side of the middle, the 5th groove being richest? If so, not a bad place to be, I suppose, I certainly don't want to be lean. However, I'm really unclear of where to go with this new needle, since its thicker, and I'm confused about the 5th groove. Is the 4th groove the bottom, the richest ? or is there the 5th groove considered a usable groove, making 4 NOT the richest setting? If so .. I'd go to 4 , as was the original. However, if 5 is not considered a usable position,,, I'm considering setting up at groove #3.
The point is, i don't think i should be going to the richest, so does the 5th groove count?
The bike is otherwise stock.
Any knowledge is welcome!
