03cr 250 airbox

mxfiend
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Riverside, CA US
Edited Date/Time 1/22/2016 3:27pm
So im in the middle (or back to the beginning... thanks theifs) of my full rebuild chassis and engine and i took my airbox off to find a small crack forming at the bottom. As im well aware the 02-04 had the airbox issue, if i buy the 05-07 which is actually cheaper anyways... does it bolt right up amd does it fix the issue or will i still have to do the mxbonz kit?

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cslacker
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Glendale, AZ US
1/22/2016 11:08am
mxfiend wrote:
So im in the middle (or back to the beginning... thanks theifs) of my full rebuild chassis and engine and i took my airbox off to...
So im in the middle (or back to the beginning... thanks theifs) of my full rebuild chassis and engine and i took my airbox off to find a small crack forming at the bottom. As im well aware the 02-04 had the airbox issue, if i buy the 05-07 which is actually cheaper anyways... does it bolt right up amd does it fix the issue or will i still have to do the mxbonz kit?

Doesn't fix the issue but it is better than the 02-04. It is also longer as the they went to a shorter carb in 04 or 05. I'm 99% sure you can use the older 97-01 airbox and it fixes the issue. It does change the angle of the carb a bit but from what I've seen works fine.
FGR01
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Fantasy
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1/22/2016 11:15am
cslacker wrote:
Doesn't fix the issue but it is better than the 02-04. It is also longer as the they went to a shorter carb in 04 or...
Doesn't fix the issue but it is better than the 02-04. It is also longer as the they went to a shorter carb in 04 or 05. I'm 99% sure you can use the older 97-01 airbox and it fixes the issue. It does change the angle of the carb a bit but from what I've seen works fine.
sounds like you are talking about the Airboot, not airbox ?

In any case, if you're in there ripping apart the airbox/airboot, might as well throw on the Twin-Air or MXBonz sealing ring kit. They are absolutely necessary on those bikes. That airboot-to-airbox sealing setup was such a joke on those. Caused my crank to get ruined in my 2002 before the recall notice even showed up in the mail.
cslacker
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1/22/2016 11:39am Edited Date/Time 1/22/2016 11:43am
FGR01 wrote:
sounds like you are talking about the Airboot, not airbox ? In any case, if you're in there ripping apart the airbox/airboot, might as well throw...
sounds like you are talking about the Airboot, not airbox ?

In any case, if you're in there ripping apart the airbox/airboot, might as well throw on the Twin-Air or MXBonz sealing ring kit. They are absolutely necessary on those bikes. That airboot-to-airbox sealing setup was such a joke on those. Caused my crank to get ruined in my 2002 before the recall notice even showed up in the mail.
Correct, airboot. That is what the issue is with the 03. I have the mxBonz on my 03 also but I have seen many who put the 97-01 boot on.

As the OP mentioned, his 03 airboot has a crack so he needs a new one anyways. Might as well just buy one that fixes the issue which would be the older one (97-01). Otherwise he has to buy another 03 and then the mxBonz kit which adds up in cost.

You end up installing the new airboot the same way you would the mxBonz kit. You have to drill out the nubs on the inside of the airbox so that you can use the screws from the older metal airboot rim. I actually have 1 at home and I was considering swapping it to replace my 03 airboot with mxbonz kit since I prefer the angled contact point of the 01 OEM airboot to the flat rim of the mxbonz kit. I also have a cr500 so sharing filters would be convenient.
FGR01
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Fantasy
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1/22/2016 1:12pm
He said his airbox is cracked. Not his airboot. Probably meant his airboot anyways.

The Shop

mxfiend
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310
Joined
1/30/2013
Location
Riverside, CA US
1/22/2016 3:27pm
Thanks for the replies...the airbox itself is cracked the airboot is perfect... ive never heard of anyone doing the 01 airbooot?

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