450 motor in 250r frame

[tlcracing]

just want to know if the crf or yz motors will fit into the 250r frame or if its to small for the motors. i know they go into the ex but my buddy has a r frame for sale

[250R Baja Rider]

My friend has a crf motor on a 250r frame.

He is a pro welder, so making the motor mounts and modifications was a piece of cake for him. But the motor does fit.