Can you see what is wrong here?

[Minia]

So I found an engine for sale, originally from a nsr125r. Apparently it has a new piston and just needs top-end and side cover. Just wondering if anyone can spot what makes this interesting...

[Calum]

Wow!

That's uhhmm, brave.

[Minia]

@Calum Don't know if brave is the correct word here.

[declan]

@Minia loooooool

[Louis-DT-WR]

4t piston?

[Minia]

@Louis-James Yeah. I don't understand what happened there...

[Calum]

@Louis-James @Minia Ohh, I thought it was missing the cylinder. Yeah that makes sense now....