01 ec250 engine interchange

[drdude]

Hi all I have an 01 ec250 and am looking at rebuilding a 250 or 300 motor that I was hoping to just drop directly into my existing frame.
I did some research and apparently 99-04 bottom ends are direct swaps into frame and top ends 99-present. Is this correct in anyone’s experience, and does that apply to 250 and 300? Or can you please point me in the right direction thanks.!!

Thanks in advance.
Dylan

 

[cbutler]

03 they changed the swing arm pivot bolt that ges threw the back of the motor to a larger one.