Those viton needles have a residue on them, left over from the manufacturing process. The cure is to clean both the needle and the seat with aerosol carb cleaner, (be generous with the cleaner) and when both are dry, shoot a little silicon spray lube on them.
I discovered that trick after having a few rebuilt carbs come back to me because of sticky needles. Never had another problem after that.
The viton tipped needles replaced the steel and brass needles because the all steel needles DID wear out and then no longer functioned as intended. The viton tipped needles do NOT wear out. The only thing that will create a wear ring on a viton tipped needle is someone using a hammer to "seat" the needle.
Viton tipped needles are the only thing available anymore. Learn how to work with them instead of complaining about them.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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