I'm talking about jets(I know the difference), so you are saying the smaller jet on the K7 450 should go all the way through? I don't have this bike going yet although it will run but not idle. Please clarify, thanks.The "jets" with the holes in the sides are generally emulsion tubes which supply a place for air and fuel to mix.. The jets screw into them. The jets should be squeaky clean as must the passages in the carb body. Were those in the carbs when you ultrasonically cleaned them? Be very careful with the wire type cleaners as any damage to the jets can compromise their function.
That jet in the parts fisch doesn't match what is in my 74' carbs, perhaps Eric has a newer set of carbs with the plugged jet that matched mine.The jet in the picture (part # 20 in the fiche) should have a hole going straight through (even the screwdriver slot appears to be filled with whatever that is). It screws into part # 19 which appears to have holes in the sides but not in the ends so, when the two are assembled, it would not go all the way through. In any case, the jet in the picture is clearly obstructed and needs to be cleaned or possibly replaced.
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(Referring to picture in Eric's first post)