View Full Version : 2 Stroke Expansion Chamber

06-02-2016, 12:44 PM
Im in the process of chopping up an old honda mt 125 for shits and giggles. So far i've got everything I need, but I cant figure out what I should use for the pipes. Im fine with welding together a new pipe, but I don't have a roller to make an expansion chamber. Can anyone tell me where I can buy a pre-made chamber/a pipe to use?


06-02-2016, 1:26 PM
A custom pipe would be worth much more than the motorcycle, so you might want to ask a local sheet metal or HVAC shop about rolling your parts after you cut them.

http://www.mopedarmy.com/wiki/DIY_expansion_chamber_exhausts has design info.

06-03-2016, 6:56 PM
Google. Try it.

06-03-2016, 9:20 PM
You could also weld together flats like a coffin tank. I had a old ts250 and in the factory manual it showed you how to it. Really easy and worked awesome.

06-05-2016, 4:17 AM
You could try this.


Just be sure to get all the air out of the system before you pressurize. I made one test part of 18 g steel. Leave some extra on the end and taper them to a point.

06-05-2016, 9:45 AM
holy fuck that's awesome sandman.