Maintenance & Technical > KX500 Original

Exhaust pipe tuning

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hangtime:
Well here is the first prototype. The fit is real nice, next we'll see how it runs

KXcam22:
Nice work! Cam.

booneylander:
I've been doing a bit of research into pipe design and happenned on this thread. My '83 KX500 has a very different looking pipe compared to the newer watercooled Kxs, and I find that my bike has a ton of torque right off idle, but starts to fall off at fairly low rpms, so I was wondering if it might be a pipe tuning issue and whether I could easily change the pipe to give me more top-end rush.

I found this java program that you can play with to design a pipe, I have no idea if it's at all worth anything in terms of actually making a pipe, but it's interesting to play with the sliders on the right hand side to see how changing a parameter affects the design of the pipe in a general sort of way.

http://www.mh-aerotools.de/airfoils/javapipe_de.htm

KXcam22:
Boneylander,
  If you are looking to increase the midrange it might be easier to raise the top edge of the exhaust port.  Given its an 83 I am assuming it has no power valve.  Pipe work takes some care and attention to get it to fit right - you also need to be (or know) a decent gas welder.  On the other hand, raising the port 1mm (at a time) is easily done with a small round file.  Ive done both and porting is less work IMO. Just an idea. Cam.

KXcam22:
I forgot to add that calculating the dimensions of the pipe to match the port timing of the engine can be interresting and fun. Cam.

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