Maintenance & Technical > KX500 Original

Exhaust system mod

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tschisi:
Hello!


I own a 1990 KX500 which looks pretty much original at the moment.
http://img163.imageshack.us/img163/8090/kx500.jpg

I will do the rear fender mod in the next days, which leads me directly to the next project:
Making the exhaust system look a little bit more up to date, but keeping the original muffler and the engine "quiet".
My idea was to place the muffler angular behind the side plate, hiding it a little bit.
With some modifications of the air box and self-made pipes that could work.
http://img94.imageshack.us/img94/553/kx500eh.jpg

I?m only afraid of the increase of "flow-resistance", caused of the "S" in the pipe.
Has anyone ever tried this or knows how it will affect the engine?


thx

KXcam22:
The S pipe will not restrict the flow at all but the real problem is that the path of the pipe is right through the airbox.  Plus the pipe needs clearance so it doesn't melt the plastic so you would end up cutting a large hole in the airbox. Then possibly the filter won't fit.  I understand what you are wanting to do but it is a lot of work to get there.  Besides, have a look at the euro 450 race bikes.  They all have a huge silencer that sticks up above the rear fender. Hope this helps. Cam.

tschisi:
Arrgh, that?s not what i wanted to hear, but i guess you?re right.
Another problem, that just came to my mind, could be thet the rear wheel would probably collide with the muffler when landing a jump.

What do you think about shortening the muffler?
The rear mounting hole could be used as the front mounting hole.

jfabmotorsports.com:
They can be shortened with minimal work. I have done this to a few, just a little noisier.

JFAB

tschisi:
Just a little noisier?
Sounds good, i heard it would become very loud.
I think i?ll give it a try...

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