megelli 125m project (help)

Hello all,

My name's Dan and I'm currently working on a 2008 megelli supermoto.
An idiot owned it before who crashed it, and completely hashed up the wiring to the point that I thought Jack the ripper would have done a neater job with a butter knife!! Anyway it has a deni pz26 carb. Because I have fitted a asbo aftermarket exhaust on her, I now have to up jet the main. Please please please someone help me find out what the standard size jet is because the one on the bike is damaged and unreadable So I can't search for a size up untill I know the standard size! She's a 125 four stroke. Thanks for help in advance. Dan.