Originally Posted by SqueegUK

Thanks mate, but I tried all the tuning advice from here, including richening up the top end and leaning the bottom end, but to no avail. If I set the HSN flush and then I leaned in the LSN until it was idling well (about 2 1/2 turns in), then the engine won't run at all. It just sputters when I rry to drive off, I need to lean the HSN in quite a bit to get it to run anywhere near decent. I also kept on getting flameouts all the time???? Engine would die for no reason at all.

I have sealed the whole engine too on the carb and back plate and used green slime on the needles to ensure no air leaks there. Oh well, you win some, you lose some.