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I have a 2005 crf 450r dirt bike with a blown motor with un repairable cases. my question is that what years are the motors the same? I believe the "second gen" crf 450 is from 05-08. so knowing that an 08 motor is identical to an 05? just want to be sure before I got buy a right side crank case from an 07 and an 05 left crank case. any feedback will be greatly appreciated!

#projectbike #rebuildingmotorproblems

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Just found a complete bottom end from a “2007” will that work in an 05 frame?

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I believe you need to get both left and right side as a set. I think they are machined to fit together, preventing mixing and matching. Any pro builders who can verify this? I know it's true on my KTMs.

Tough break by the way, sorry to see that much damage.

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On ‎4‎/‎8‎/‎2019 at 11:48 PM, lrbest4x4xfar said:

I believe you need to get both left and right side as a set. I think they are machined to fit together, preventing mixing and matching. Any pro builders who can verify this? I know it's true on my KTMs.

Tough break by the way, sorry to see that much damage.

Honda runs a center gasket so cases can be mixed and matched Frankenstein style

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Same thing happend to me , bought full bottom end for £270 GBP 

Cranks shot but giving it full rebuild 

Unfortunately non of my cases from my bike were salvagable 4 cases gone 

On plus side turns out ive already got upgraded valves and springs 

IMG-20190411-WA0002.jpeg

On 3/18/2019 at 3:45 AM, Luker007 said:

Just found a complete bottom end from a “2007” will that work in an 05 frame?

Yes 05-08 same bottom ends will bolt straight in

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On 3/17/2019 at 11:45 PM, Luker007 said:

Just found a complete bottom end from a “2007” will that work in an 05 frame?

Yes. Use the 05 headstays of course. If you where putting an 05 in a 07 frame you'd use the 07 ones.

Edited by HRC27

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