Looking for KX two stroke guru

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12/1/2017 7:49 AM

I would like to know the actual difference between a 2003 KX250 pipe and a 2005-07 pipe. Is it actual design/shape differences or is it just mounting points? I have a 2003 and would like. pipe that is only made for newer models. If all I have to do is change the mounting points then cool!

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Mike

689

Thanks to all the people that have not beaten me to death yet!

12/1/2017 12:24 PM

Ardfarkl wrote:

I would like to know the actual difference between a 2003 KX250 pipe and a 2005-07 pipe. Is it actual design/shape differences ...more

I'd be willing to bet it's shape of the pipe. fitment wise, they're probably near similar but optimized to take advantage of their respective port timings.

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12/1/2017 12:27 PM

Also, how the top of the expansion chamber mounts to the frame.

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12/1/2017 6:24 PM

The 05 and up motors use a different exhaust flange. The older motors the pipe went in the cylinder flange, on the 05 and up the pipe goes over.

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12/2/2017 1:24 AM

It absolutely will not fit the cylinder. Google some images to compare.

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12/2/2017 4:09 PM

Was afraid of that. Thanks for the input everyone! Bummer!

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Mike

689

Thanks to all the people that have not beaten me to death yet!

12/3/2017 10:25 AM

One slides into the cylinder and the other fits over. They will not work. I was given a few pipes for an 03 and my 05 is totally different

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2017 RMZ450
2005 YZ250-sold :,(
1998 YZ250
2005 KX250F

80% of the time it works every time
IG @2HRacing
Thanks to : Factory Effex, N2Dirt, Acerbis, DT1, Fasthouse, Matix, FMF, ASV, 100% & Mika Metals