Thanks Grumpy,
A very valid point re the safety glasses (oops). As for the B&S engine, I don't have any experience but am willing to learn.
The motor seems to be in good nick and not burning oil. The matter of cleaning the combustion chamber is a tick the box item in the owners manual every 100-300 hrs, so I thought it may be quite straight forward. I would be hesitant at attempting any adavnced maintenance if its not really necessary though.
I have the owners manuals for the grenfield and the B&S and can post scanned copies if it would help the archive. If so, can you suggest a location on the site?
Cheers, Steve O Mac