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400 exc to 450

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Ok geniuses!!! I have heard of people changing a 400exc rfs over to a 450. What does it take to do this? I have an 06 450 sx rfs and want to put a 400 crank in it. Does anyone know of a piston for this swap? Thanks! V.

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The time honored method of converting the 450 RFS to a 450 is with a big bore piston.

 

Why would you want to put a 400 RFS crank in a 450 SXF RFS?  Since the stroke is the same or at least very similar the only gain might be extra crankshaft weight (inertia).

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To anyone interested, this is how it's done. You must use the 64mm full circle crank (not the sx pork chop crank), along with a 95 mm 525 cylinder and you must use a proprietary Wiseco piston that is only available from Thumper Racing. The piston number is 9631m09500. You must also lentghen the timing chain. Good Luck! V.

Edited by vidarapido

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