Cheers for the replies guys.
I think I'm gonna get in touch with the workshop that rebuilt it a few months ago and have a word with them. I can't remember getting a guarantee for the work they done as I just presumed this would be daft. How do they know that I've run the engine in sufficiently not ...

OK guys, not too sure what sort of advice you can give me on this but I have a bit of a dilemma. :cry:

I've recently paid around the £700 mark to get my top end completely re-bulit as I blew up the piston etc. I understand about running engines in and everything, but after only 200 miles, I think ...