A short tutorial on replacing the keihin PWK emulsion tube
Re: How to replace the emulsion tube
Posted: 04:23 am Dec 24 2025
by billie_morini
Darryl, thank you! I'll likely press the tube into place. I'm not a fan of hammering on small aluminum parts, especially when they are not readily available. billie
Re: How to replace the emulsion tube
Posted: 07:50 pm Dec 26 2025
by Chuck78
One comment, this is actually more properly called a needle jet. An emulsion tube serves a bit different purpose and is located in basically the same location of the carburetor, but the emulsion tube has a lot of small holes drilled around it in the middle section. The emulsion tube is also typically a combination part that includes the main jet receiving threads. Sometimes the emulsion tube is also the needle jet as well as the main jet holder.
Re: How to replace the emulsion tube
Posted: 02:15 am Dec 28 2025
by kdxdazz
Chuck78 wrote: 07:50 pm Dec 26 2025
One comment, this is actually more properly called a needle jet. An emulsion tube serves a bit different purpose and is located in basically the same location of the carburetor, but the emulsion tube has a lot of small holes drilled around it in the middle section. The emulsion tube is also typically a combination part that includes the main jet receiving threads. Sometimes the emulsion tube is also the needle jet as well as the main jet holder.
Agreed but I've found needle jet and jet needle get confused and the average person seems to call them emulsion tube so I just went with that vocabulary
Keihin CV 26mm has the last that you stated,a combined emulsion tube and needle jet, the keihin PE from Japan has no emulsion tube but the PWK 28 and Thai made keihin pe28 have an emulsion tube and separate needle jet although they don't share the same emulsion tube