Is this what i hope it is??

[RED ALERT]

I was collecting some parts from a friend to fix up my 250R, when he asked me if I knew what the the head and barrell on the right was off.
We agreed it looked big bore Honda and I took it home to compare with my 480 (on the left). After having another look at Caps 480 resto,
I'm pretty sure it's a Mugen kit. The piston in it is maybe 2.5 - 3mm smaller than a 2nd oversize 480 piston, so is it a 450 or 480??
I really want to keep it.

[cyclegod]

Here is what it is......

http://www.alp-sys.com/honda-elsinore/bikeofthemonth/aug2006_files/index.html

[motomaniac]

If its Mugen it will have mugen cast on it somewhere , if not its a Honda issue works part which is same as Mugen but without the name casting.Its 460 for sure.Whats the bore like?

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[RED ALERT]

Thanks guys,
Moto, the only markings on the barrell are underneath the reed flange, it's stamped 'B  21'
Will take some more shots when I get a chance, cheers.

[mcmuffin]

if its an 89mm piston its a 480 mugen kit worth around 2k

[caps 999]

It's a 460 kit same as the one I'm runing on my 480 if you look at the base of the barrel there will be a vent toward the back of the barrel to run this kit on a 480 you will need to get that welded