Carb Piston Tube Construction

As follow up to our discussion on the thread I fail to find, I have a report back concerning how those piston tubes are constructed that would preclude leakage out the bottom of the tube.

4 screw tubes are one solid piece drilled from both ends leaving a solid floor at the bottom of the tube

3 screw are a little more involved. The tube is drilled full length. An insert is then pressed into the bottom of the tube. This insert has a hole drilled thru it to accept the needle. A what looks like a ball bearing is pressed into that hole and it nestles itself into the metal. We think then the insert may pressed into the tube as the fit is tighter than a well, you know.

Bottom line there is no way any oil is going to find a route of escap other than over the top of the tube.

We cut 'em apart, drove out pieces all of which was done at the ZTherpy laboratory this very afternoon...

Now if someone can find that original thread and put this there, I'd appreciate it

Cheers