Description
This jet is identified by the numbers 640 being stamped on it but you may also find that there are other needle jets that though having a different series number stamped on them, are in fact identical to the 640 and thus interchangeable. The 640 series are used in our TM33- 8012 carburetor. These NJ’s use a N100.604 type round main jet which is a different thread and sizing scale than the Hex type main jets.
The lower the letter and number indicates the leaner the jet. Example N-6 is leaner than N-8. These are in 0.01mm increments and the 1/2 size 5’s are in a 0.005mm increments. Only the shown sizes are available.
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