The inside view of a 1971 LJ10 Expansion Chamber

Notice (even though it is blurred) the "cloth" around the outer edge, this

no doubt is to muffle the sound, so it doesn't sound like a dirt bike. Not

sure what it is made of, but looks like a cross between asbestos and fiberglass.

This first picture is of the "Exit" side (end).

This is the inlet side (end) a normal LJ expansion will not have the waves in it,

this one has been dented a few times.

Another view of the Exit side. The way the expansion chamber works is: They harness the sound waves coming from your engine, to first suck the cylinder clean of spent gasses, and in the process, drawing fresh air/gas mixture "charge" into the chamber itself, and then all the charge gets sucked back into the cylinder, filling it to greater pressures than could be achieved by simply venting the exhaust port into the open atmosphere. In turn it gives your engine much more power than ever imagined, this process was developed in the 1950s by Walter Kaaden, who was working at the East German company MZ. Kaaden understood that there was power in the sound waves coming from the exhaust system, and opened up a whole new field in two-stroke theory and tuning. Suzuki made the length and size just right for the amount of low end torque needed for the power LJ's put out, with out it, they will not have any power to climb let alone go down a flat/level road. We have fixed a couple LJ's for people that couldn't figure why they had "No Power" after they put on a brand new exhaust system... without reinstalling the Expansion Chamber.