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How to measure keihin dump tube size?


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There are micro bore gauges that machinists use, however it would be quite the chunk of change to spend to measure some dump tubes. Easiest way would be to find a precision drill set that machinists use and flip to the rack that is numbered, not lettered. If all you can get is lettered, there are charts out there that show what size each letter bit is. Most of these things are drilled in the .115-.130 range. Just start dropping them in till they will no longer fit.

Edited by trickedcarbine
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There are micro bore gauges that machinists use, however it would be quite the chunk of change to spend to measure some dump tubes. Easiest way would be to find a precision drill set that machinists use and flip to the rack that is numbered, not lettered. If all you can get is lettered, there are charts out there that show what size each letter bit is. Most of these things are drilled in the .115-.130 range. Just start dropping them in till they will no longer fit.

This^^^ of get a numbered or lettered drill, post it here and I will give you the decimal/fraction of an inch associated with it.
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