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Engine swap?

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I've heard you can put 250 engines in 125 frames, does anyone know if this is true? And if so would an 03 250 motor work for an 02 125? Thanks guys

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In most cases ~ "no" you cannot simply bolt in a 250 motor in a 125 frame with out performing major modifications to the frame cradle.  It would be far easier to just buy a 250 frame.  And for the most part there is nothing to be gained by doing this, as they share roughly the same components, the suspension valving differences are due to the different power levels (between 125 & 250) and the few extra pounds that the 250's engine has over the 125 engine.

 

So while I do not know if you can do this swap, I see no value in attempting it either.

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