Recently spotted at the Japanese national championships, the CRF250 and YZF450 look like they've had a major overhaul for 2014.

The CRF250 looks like it's fallen inline with it's big brother, the CRF450. Including going back to the twin piper setup. I can't help think that Honda has ripped off the KTM back end - what's your opinion?

The YZF450 has an all new exhaust design with the header pipe wrapping the cylinder head. This affects the subframe and most likely the rear shock setup. The tank is different but I wouldn't be sure if this will transfer to the production bikes (these pics are the prototype bikes used in the Japanese championships).

So it seems that Honda have gone back to the twin-pipe setup on the 250F

So, Yamaha copy the old Honda tail piece and Honda copy the current KTM one - go figure!

I never though I'd see them go back to the twin pipe on the small bike!

It looks like the header pipe on the new 450 wraps around the cylinder head, seems a better idea than the old setup.

mmmmmmmmmmmmmm.....

An increase in castrated MX riders has caused Yamaha to locate the filler cap under the seat out of way of the riders....em.... jewels. (Source - makeuppy)