Finally I come up with solution and prototype to this sticky needle issue. I prefer not to change the design of the needle nor the quality of the Viton tip. The sealing ability of the current design is excellent and promising. Now we're only dealing with sticky needle. How to pull the needle when float drops without sacrificing the sealing quality? Looking on the existing design of the primer cap, I came with designing and making a "Needle Spring Lever". It's a combination of spring and a fork which attached to the float mount with a fork sliding though the needle crown. When the float drops, the float rear end will lever the spring and pulls the needles out while the fork is sliding through the needle crown. I have made a prototype made off a guitar string. Please see attached photos. I believe that his sort of design has never existed on any type of carburetors and I would like to welcome you to name this part. I would like to hear your thoughts and ideas. I will send this prototype to the manufacturer and to properly design the Needle Spring Lever. Thanks for all your thoughts and ideas.
