250x/300 plastics?

[nismo]

will 300ex plastics bolt up perfect to a 250x or are they different in anyway? and will a 300ex head(top end) fit on my 250x base without modifying it? thanks

[TRX300X]

The X and EX use the exact same plastic. If you look at the plastic on the EX it even has the indentation on it for the kickstarter left over from the X. The top ends on the X and EX are also interchangeable. You can use a EX top end on an X bottom end as long as if you have an X bottom end use an X piston. If you have an EX bottom end use an EX piston. The wrist pin location on the pistons are different but the bore is the same.