KX250 AF build, airboot advice?

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12/29/2017 11:19 PM

I'm in the middle of putting an 05 KX250 in an 09 KX250f roller. I read in an old thread that on an 08 KX250f roller/airbox that an 01 CR250 airboot fit right up, anyone have any experience with these or know someone that does?

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12/30/2017 9:23 AM
Edited Date/Time: 12/30/2017 9:25 AM

I have not tried The 01 CR250R boot but I have tried the 2000 CR250R boot and it works in a KX500 to 07 KX250AF conversion so I don't see any reason why it won't work for your 250.
You will need to make a adapter plate between the air box and the boot.

Here is some pics comparing the 98-99 CR250R boot to the 2000 CR250R boot.
The 98-99 boot is on the left and the 2000 on the right.

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12/30/2017 10:40 AM

Dude that's awesome, I really appreciate the input! That 500 must be a blast to ride, I debated a 500 but wanted something a bit more track friendly and am admittedly not man enough to rail an open bike on a rough track

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12/30/2017 10:55 AM
Edited Date/Time: 12/30/2017 10:56 AM

spode262 wrote:

Dude that's awesome, I really appreciate the input! That 500 must be a blast to ride, I debated a 500 but wanted something a bit more track friendly and am admittedly not man enough to rail an open bike on a rough track

No problem. I can't rail my 500 on a track or anywhere, except the desert and dunes.
Deep sand reduces effective HP by about 20% so unless your riding in the deep sand or your a BIG guy, you don't need the 500 and will likely ride faster on a 250 cool

Another upside is the 250 will fit a 250f chassis a lot better then the 500..

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2/5/2018 2:50 PM

Sorry to bug you again, what did you do for rads on your kx builds? I looked at modding the 250F rads but it's quite a bit of cutting on the bottom tanks and then spacers to clear the pipe and cradle casting. I assume the shorter 2 stroke rads fit up better, is that what you used?
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2/5/2018 7:24 PM

Feel free to ask any time.
I used the 250F rads..
But that was also with a 500 conversion.

Cut n paste cool

I know of a few other guys that also used to 250F rads as well in their 250af conversions.
For me it was just easier..

Your build is looking good.

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2/5/2018 9:02 PM

The stock left radiator should fit without mods. The right side one - pipe side- try a RMZ250 right side radiator. It's short... used it on a AF conversion as well. You will have to relocate some hose attachments but that's not hard at all if you have access to someone that welds AL.

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2/5/2018 9:09 PM
Edited Date/Time: 2/5/2018 9:11 PM

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This is another way to do the air boot... you can find a piece of rubber hose that fits over the bell of the carb in your local
hardware supply store..In the plumbing section. It's a repair joint thing.... Bring the carb with you and find the one that fits. cut it to fit the gap. It will slip over the stock air boot once you sand down the grove for the clamp on it...See the picture.

Now, inside the boot you have to put in a plastic ring to hold pressure from the hose clamp holding it on...You can see a little white plastic poking out of the boot end in the first picture. use lots of moto seal on the joint...Put a second hose clamp over the joint... Done for less then 10 bucks!
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2/5/2018 9:19 PM
Edited Date/Time: 2/5/2018 9:21 PM

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The white plastic thing I inserted in the boot to be able to clamp down onto it was also found in the plumbing section. Found something that fit... cleaned it up with a dremel tool.. moto seal it in place.. Hose clamp...good to go.

It's one solution for cheap if you can't find a boot that fits.
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