1989 - 94 KDX200 Pipe Modifications

Its not a matter of improving back pressure in the pipe but rather removing the material to change the volume of the pipe plus the baffling material stifles the positive and negative pressure waves/ ultrasonic waves in the pipe throwing the cylinder scavenging all out of whack. Kawasaki originally designed a very good pipe for the bike then installed the baffling material and through it all out of wack. If you want to lean more about how the pipe effects power on a two-cycle motor have a look at the KIPS valve article. There are a couple links the pipe articles that will help you better understand that's going on you your pipe.

The silencer will supply the backpressure.

David

Mark its a very simple job. As soon as you cut into the pipe it will be obvious what you need to do. The first time out I can't imagine it would take you more than a couple hours. Don't hesitate to chop the stock pipe the results are very noticable and very worth while.

If you have a camera around when you remove the lining could you take of picture of what's inside. I'll add it to the article. Thanx

David