We changed the plug today for an OS F and re set the needle valves and regulator, It started better and ran more consistant. When I stripped out the original tank I found a leak and the bung wasn't holding pressure. I'll keep you posted on the performance, just needs some more running time. Just out of interest, do you have a list of modifications that have been carried out on the DZ 140's. It would be good to see what has been done to my motor and if there is anything outstanding.

Thanks for the help so far Pete.
Take care.

James.