Jump to content
Sign in to follow this  
wheredahoesatracing

How to measure keihin dump tube size?

Recommended Posts

I have a set of 40mm keihin alcohol carbs and im wanting to find out what my dump tubes are drilled at. Can someone tell me how and what i need to measure them?

 

Sent from my SM-N910P using Tapatalk

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

gauge pin would probly be easiest way. find a machine shop with gaug pin set and they probly do it for free

Yes^ gauge pin... Why the fuck could I not recall that. Couldn't think of what to call it other then a micro bore gauge. Teuche'

Share this post


Link to post
Share on other sites

f5a86fe4fc70d59dab2a4b2269c506ac.jpg

Here

NICE i remember that chart from machine shop in high school! The fucking bongs we built in that class were mind boggling! ;)

  • Like 1

Share this post


Link to post
Share on other sites

Darren , just remove the main and stick the largest drill bit in it that fits tightly and measure it with a mic or look up what size the bit is in inches. Like .116 , .122 etc. .122 is close to 1/8th inch.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×