Author Topic: CR500 Pipe  (Read 3747 times)

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Offline BigGreenMachine

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CR500 Pipe
« on: March 30, 2007, 01:20:16 AM »
Will it work on a KX500 motor? Rob power? Seems to be the way most go when they do a motor swap to the 250 chassis. What do you guys think?


Offline gowen

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Re: CR500 Pipe
« Reply #1 on: March 30, 2007, 01:47:39 AM »
There has been research on this issue by AJ and hangtime(?). I believe it works, but you have to change the bend. I have a friend that is doing this now and is welding the bend from his KX pipe onto his CR500 pipe... He says it will work.. There is a post here about it..

Offline BigGreenMachine

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Re: CR500 Pipe
« Reply #2 on: March 30, 2007, 02:30:32 AM »
Well what I'm really curious about is how it would affect power delivery. Being that the two motors are different bore and stroke I would think using a pipe from one on the other would limit power somewhat.

Offline BigGreenMachine

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Re: CR500 Pipe
« Reply #3 on: March 30, 2007, 02:45:58 AM »
01 CR500 89 x 79
KX500 86 x 86


Offline gowen

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Re: CR500 Pipe
« Reply #4 on: March 30, 2007, 02:54:59 AM »
It will effect performance, it could be better or worse.. The longer the stinger and section it seems the more mid-top range. I'd guess some low power gains using a cr500 pipe and loss up high.. Here is where it was discussed here.

http://www.kxriders.com/forums/index.php/topic,2525.0.html


hangtime

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Re: CR500 Pipe
« Reply #5 on: March 30, 2007, 03:44:54 AM »
After putting my hands on the zipty pipe I would say this is the best pipe to start with. It starts out very close to being a lowboy pipe, and with a couple of welds you could align the pipe with the new silencer route. You might even try the 99-02 250 silencer. Probably the biggest advantage to the zipty is the pipe routes around the cooling hose on the side of the cylinder. My pipe seems to work nicely, unfortunately I couldn't explain why. Starting with 60 something HP doesn't hurt either.

MetalMan1011

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Re: CR500 Pipe
« Reply #6 on: March 31, 2007, 07:01:16 AM »
For my 250F conversion I used a CR500 Pro Circuit Works pipe.  After a few tweaks and welds I got it to fit.  One of the things I had to do was cut off the end of the pipe that connects with the cylinder and weld a piece from a K5 pipe on, it's outside diameter was  too large to fit the cylinder.  It seems to work very good, but I can't comment on the power differences with a KX with a stock pipe because I have never ridden a regular KX500.     

Offline BigGreenMachine

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Re: CR500 Pipe
« Reply #7 on: April 01, 2007, 06:07:33 AM »
I figured I would have to cut the flange.  How much trouble would the KX pipe be to make fit?

Offline don46

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Re: CR500 Pipe
« Reply #8 on: April 01, 2007, 01:24:01 PM »
The stock KX pipe is a real pain to make fit, look at the picture of my bike you'll see all the cuts and welds to get it to clear the water pipe, radiator, and kickstarter.
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Offline BigGreenMachine

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Re: CR500 Pipe
« Reply #9 on: April 01, 2007, 11:37:44 PM »
Yeah but the headpipe looks great! Pro Circuit? The tail of it seems like the harder part to change IMO.

Offline don46

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Re: CR500 Pipe
« Reply #10 on: April 02, 2007, 03:59:59 AM »
Yeah its a Pro Ciorcuit. The tail section was easy, I cut the stinger off the pipe, then used a larger diameter pipe to slip the stinger into, welded on a couple of spring tabs and the cut and twisted so the stinger turned upward. The center section was the most difficult to fabricate. I have a Pro Circuit pipe I'm going to try when the weather gets decent.
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