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When the carb is at tickover the needle is at the thick 0.0890 , top part of the needle in the Main Jet . .
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When the throttle is opened the needle rises up out of the main jet .
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As the needle gets thinner towards the bottom pointed tip , more fuel is allowed in .
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The AAT needle is the most commonly used .
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SIZE in INCHESFOR USE ONFOR USE ONFOR USE ONFOR USE ONFOR USE ON
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Used on the early Robin 850cc 9.5 to 1 compression ratio engines before the enclosed overflow system was introducedLater NORMAL 850cc 9.5 to 1 compression ratio Robin and Rialto engines with the enclosed carb overflow system . RIALTO H.T.E {YELLOW TOP} 850cc 10.5 to 1 compression ratio with the enclosed carb overflow system . UNKNOWN SPEC but was this for the 850cc 7.5 to 1 compression ratio ?MINI CARB NEEDLE ; This is the needle fitted in a standard MINI carb
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CODE for JET NEEDLE ................{ Spring }CODE for JET NEEDLE ........{ Spring }CODE for JET NEEDLE ............{ Spring }CODE for JET NEEDLE ................{ Spring }CODE for JET NEEDLE ........{ Spring }
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SIZE in inches for NEEDLE Stations starting at the TOP { Station 1 } and moving 1/8 inch to the next station and down to the point tip of the needleAACAATAEBABSAAV
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Top Station is 1 and 7 /8 inch from the needle point and is right under the step ; Station 10.0890.0.0890.0.0890.0.0890.0.0890.
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1 and 3 /4 inch from the needle point ; Station 20.0855 SAME as AAT0.08550.0855 SAME as AAT0.0855 SAME as AAT0.0855 SAME as AAT
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1 and 5 /8 inch from the needle point ; Station 30.0835 WEAKER than AAT0.08320.0835 WEAKER than AAT0.0835 WEAKER than AAT0.0835 WEAKER than AAT
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1 and a 1 / 2 inch from the needle point ; Station 40.0811 WEAKER than AAT0.0810.0812 WEAKER than AAT0.0814 WEAKER than AAT0.0815 WEAKER than AAT
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1 and 3/8 inch from the needle point ; Station 50.0788 WEAKER than AAT0.07840.0787 WEAKER than AAT0.0789 WEAKER than AAT0.0792 WEAKER than AAT
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1 and 1/4 inch from the needle point ; Station 60.0765 WEAKER than AAT0.0760.0762 WEAKER than AAT0.0765 WEAKER than AAT0.0768 WEAKER than AAT
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1 and 1/8 inch from the needle point ; Station 70.0742 RICHER than AAT0.07450.0743 RICHER than AAT0.0746 WEAKER than AAT0.0746 WEAKER than AAT
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1 inch from the needle point ; Station 80.072 RICHER than AAT0.07250.0724 RICHER than AAT0.0728 WEAKER than AAT0.0698 RICHER than AAT
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7 /8 inch from the needle point ; Station 90.0698 RICHER than AAT0.07080.0708 SAME as AAT0.0713 WEAKER than AAT0.0674 RICHER than AAT
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3 /4 inch from the needle point ; Station 100.0676 RICHER than AAT0.06910.0691 SAME as AAT0.0692 WEAKER than AAT0.065 RICHER than AAT
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5 /8 inch from the needle point ; Station 110.0655 RICHER than AAT0.06740.0674 SAME as AAT0.0674 SAME as AAT0.0627 RICHER than AAT
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1 /2 inch from the needle point; Station 120.0631 RICHER than AAT0.06570.0656 RICHER than AAT0.0656 RICHER than AAT0.0615 RICHER than AAT
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3 /8 inch from the needle point ; Station 130.061 RICHER than AAT0.0640.064 Same as AAT0.064 SAME as AAT0.0602 RICHER than AAT
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1 /4 inch from the needle point ; Station 140.059 RICHER than AAT0.06230.062 RICHER than AAT0.062 RICHER than AAT0.0578 RICHER than AAT
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1/8 inch from the needle point ; Station 150.057 RICHER than AAT0.06060.06 RICHER than AAT0.06 RICHER than AAT0.0554 RICHER than AAT
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TIP OF NEEDLE BEFORE IT TAPERS OF SHARPLY TO THE POINT ; Station 160.055 RICHER than AAT0.05890.058 RICHER than AAT0.058 RICHER than AAT0.053 RICHER than AAT
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POINT OF NEEDLEPOINT OF NEEDLEPOINT OF NEEDLEPOINT OF NEEDLEPOINT OF NEEDLEPOINT OF NEEDLE
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SIZE in MMFOR USE ONFOR USE ONFOR USE ONFOR USE ONFOR USE ON
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Used on the early Robin 850cc 9.5 to 1 compression ratio engines before the enclosed overflow system was introducedLater NORMAL 850cc 9.5 to 1 compression ratio Robin and Rialto engines with the enclosed carb overflow system . RIALTO H.T.E {YELLOW TOP} 850cc 10.5 to 1 compression ratio with the enclosed carb overflow system . UNKNOWN SPEC but was this for the 850cc 7.5 to 1 compression ratio ?MINI CARB NEEDLE ; This is the needle fitted in a standard MINI carb
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CODE for JET NEEDLE { Spring }CODE for JET NEEDLE { Spring }CODE for JET NEEDLE { Spring }CODE for JET NEEDLE { Spring }CODE for JET NEEDLE { Spring }
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SIZE in MM for NEEDLE Stations starting at the TOP { Station 1 } and moving 3.175 mm { 1/8 inch } to the next station and down to the point tip of the needleAACAATAEBABSAAV
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Top Station is 47.625 mm from the needle point and is right under the step ; Station 12.606 mm ; This size is the same on all needles2.606 mm ; This size is the same on all needles2.606 mm ; This size is the same on all needles2.606 mm ; This size is the same on all needles2.606 mm ; This size is the same on all needles
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44.45 mm from the needle point ; Station 22.172 SAME as AAT2.1722.172 SAME as AAT2.172 SAME as AAT2.172 SAME as AAT
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41.275 mm from the needle point ; Station 32.121 WEAKER than AAT2.1132.121 WEAKER than AAT2.121 WEAKER than AAT2.121 WEAKER than AAT
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38.1 mm from the needle point ; Station 42.06 WEAKER than AAT2.0572.062 WEAKER than AAT2.068 WEAKER than AAT2.07 WEAKER than AAT
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34.925 mm from the needle point ; Station 52.002 WEAKER than AAT1.9911.999 WEAKER than AAT2.004 WEAKER than AAT2.012 WEAKER than AAT
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31.75 mm from the needle point ; Station 61.943 WEAKER than AAT1.931.935 WEAKER than AAT1.943 WEAKER than AAT1.951 WEAKER than AAT
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28.575 mm from the needle point ; Station 71.885 RICHER than AAT1.8921.887 RICHER than AAT1.895 WEAKER than AAT1.895 WEAKER than AAT
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25.4 mm from the needle point ; Station 81.829 RICHER than AAT1.8421.839 RICHER than AAT1.849 WEAKER than AAT1.829 RICHER than AAT
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22.225 mm from the needle point ; Station 91.773 RICHER than AAT1.7981.798 SAME as AAT1.811 WEAKER than AAT1.773 RICHER than AAT
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19.05 mm from the needle point ; Station 101.717 RICHER than AAT1.7551.755 SAME as AAT1.758 WEAKER than AAT1.712 RICHER than AAT
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15.875 mm from the needle point ; Station 111.664 RICHER than AAT1.7121.712 SAME as AAT1.712 SAME as AAT1.651 RICHER than AAT
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12.7 mm from the needle point ; Station 121.603 RICHER than AAT1.6691.666 RICHER than AAT1.666 RICHER than AAT1.593 RICHER than AAT
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9.525 mm from the needle point ; Station 131.549 RICHER than AAT1.6261.626 SAME as AAT1.626 SAME as AAT1..529 RICHER than AAT
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6.35 mm from the needle point ; Station 141.499 RICHER than AAT1.5821.575 RICHER than AAT1.575 RICHER than AAT1.468 RICHER than AAT
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3.175 mm from the needle point ; Station 151.448 RICHER than AAT1.5391.524 RICHER than AAT1.524 RICHER than AAT1.407 RICHER than AAT
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TIP OF NEEDLE BEFORE IT TAPERS OF SHARPLY TO THE POINT ; Station 161.397 RICHER than AAT1.4961.473 RICHER than AAT1.473 RICHER than AAT1.346 RICHER than AAT
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POINT OF NEEDLEPOINT OF NEEDLEPOINT OF NEEDLEPOINT OF NEEDLEPOINT OF NEEDLEPOINT OF NEEDLE
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