[frevado]

Thank you for the answer! I m gonna buy 250 cr and 450 trannies on ebay and compare them! If it fits you will have a new market thanks to me!!

[Roostius_Maximus]

I have extra 250 transmissions, I'd be willing to measure them. The 97-01 will fit the 02-07 for sure, I have 02-03 sets on the shelf, just need to know the assembled shaft widths of the crf450x trans. The cr250 is the same as the crf450r if that helps.

[kpacker]

I have extra 250 transmissions, I'd be willing to measure them. The 97-01 will fit the 02-07 for sure, I have 02-03 sets on the shelf, just need to know the assembled shaft widths of the crf450x trans. The cr250 is the same as the crf450r if that helps.

Sorry, was doing some reading and dug up this oldie. Years back I was wanting to change ratios in an 04 crf450r. Nobody made anything. Found out a CR250 tranny was a wider ratio and would fit in my bike. I did the swap w/ I think was an 01 cr250 tranny. Worked great and still in there. There is a shim on the CR250 trans that is removed to fit in the crf450. So, the reverse should work just fine if you add that shim (or keep it from the removed tranny)