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Carb Boot Length

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Replacing old fcr carb(slide issues) with a newer one from a 05 yz450 looks like everything is pretty much a direct swap except for the carb boot is a bit too short does any one know if the 450's have a longer boot?? stock 99 wr400 boot is 25mm or a inch. Tryed searching all over but no answers on this one. on my old cr250 i used a radiator hose ?? any insight would be great! thanks

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Replacing old fcr carb(slide issues) with a newer one from a 05 yz450 looks like everything is pretty much a direct swap except for the carb boot is a bit too short does any one know if the 450's have a longer boot?? stock 99 wr400 boot is 25mm or a inch. Tryed searching all over but no answers on this one. on my old cr250 i used a radiator hose ?? any insight would be great! thanks

You can remove the upper subframe bolt, pull the subframe a bit forward. This will let you get the airbox boot onto the carb more easily. Then tighten the carb clamp and reinstall the subframe bolt.

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