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Thread pitch on 92 check valve tube?

Billinoregon

Registered
Guys, I am switching from the long deep tank to the short, shallow tank on my 92, and need to cut the check valve tube from 2 1/2 to 1 1/2 inches and thread the tip where it enters the carburetor. Anyone know the diameter and thread pitch so I can buy the right die?
 
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