Cheers for the reply lads, it's a single HS6 (1 3/4"). Used to have a waxstat jet and floating needle, have converted it back to stock with a normal jet (forget the size off the top off my head), a ZH fixed needle and a yellow spring.
Centred the jet etc so I think the carb itself is fine, it's just tuning it and a hands on lesson would be great.
Regarding the dashpot oil I had tried light oil (3 in 1, sewing machine kinda stuff), but this time I decided to follow the owners handbook and the haynes book of lies and toss in some engine grade oil (20W50).