SUCCESS! I pulled the carby apart again and found a speck of dirt under the needle seat. Cleaned it up, put it back together and she started first pull! Works a treat. Got a new plug for it too and a chain file so I'll sharpen it up tonight and give it a big test tomorrow on some big stringybarks.
Thanks for the help guys, I'm sure the manuals will come in handy.
Cheers, Ben.
Ps. I may let Dad borrow it... If he's lucky:)