I've used the cheap gasket kits off eBay on mine, they have all worked great apart from the head gasket, throw that straight in the bin.

@NINJA been running it on an iridium for a while now, bought the standards just for plug chopping

@NINJA I'll try a different plug and maybe go for a regular 15 minute run with varied rpm tomorrow to get a baseline, hadn't tried a new plug yet but bought a set of four BR8ES to play around with, I'm thinking of dropping the needle again to test but its a ballache with the split cables etc haha

@NINJA possible but I don't see a blanked out airbox causing issues, just a smooth run through a new filter.

Yeah that top bolt is missing, its been like that since the previous owner rebuilt it, I've got a bolt kit on order which hasn't arrived yet but I'm certain it doesn't leak, tried spraying isopropyl on it while revving etc in past

@NINJA pv is on the same settings it used to run on, cleaned and setup it all about a 1000 miles ago roughly so shouldn't be that.
Silver things a plug for the emmisions bottle that usually goes in the airbox

@NINJA not as far as I'm aware, no power jet on this carb and no leaks from any breathers, float height is good, both brass nossles either side of slide are breathers as far as I'm aware? I've just got the pipes open

Apologies for the state of the bike, I've not had the best of conditions or time the past few days I've been off work for testing.
I raised the needle one notch this morning, which seemed to help a lot with the throttle response, no bog when going from idle to wot
I also tried a step leaner pilot and main jet, upon riding around my drive it seemed to of made no difference to the spluttering issue I was having, so I then went up two sizes of pilot jet to see if it prefered the richer pilot, after about 50m up the road I went back home and swiftly removed it, spluttering worse than ever and barely wanting to run anything less than high rpms with wot
I then fitted the standard size pilot the bike came with, which is the smallest pilot jet I have and went for a ride. The bikes going allot better and seems fairly happy through most of the rpm, top end seems great and it's idling/cold starting nice. However I still have the spluttering issue under load, I've narrowed it down to roughly 1/8th throttle to about half throttle bad splutter, I'm guessing this is the crossover from the pilot to the needle jet? I'm unsure where to go from here, should I try lean off the needle again now I have a smaller pilot than before? The bike is practically unrideable through town behind cars doing 20-30mph, have to keep whipping the clutch in as it's spluttering so bad.

Got the carburetor on nicely yesterday, with heat the airbox went on well, cheers Calum!
Cutout the lid of my airbox completely and fitted a new air filter, it was butchered anyways.
Upon first start the caburetor was obviously way lean, would only run on choke and it sounded crackely, so swiftly shut it off and fitted one of the mid range pilots I had and removed the main jet, as to your guide Calum.
Bike ran nice, could adjust the pilot circuit nice and it seemed to have a sweet spot with the screw fairly far out. Bike would splutter badly when going full throttle, obviously due to the main jet being removed, but up to 3/4 seemed to rev nice so didn't touch the needle yet. Fitted the 142 main jet out of my kit, which was alot bigger than standard, think the second size up from my kit, bike ran nicely up to temperature on the spot, revved fairly clean but has a bog when pulling throttle wide open from idle, I know this is likely the main jet being lean but I didn't want to change it until I have the needle and pilot correct.
Went for a 5 mile run into town for some petrol, bike splutters and ran crackely up to about quarter throttle when riding the bike at a constant rpm, seemed to smooth out past that, so I'm guessing pilot is still lean?
However it also had similar symptoms while accelerating until higher rpms, once onto the main and the ypvs opened the bike went awesome, bags of power and sounded very crisp, however i didn't ring it out too much. Temperatures are staying good while riding.
I'm thinking tomorrow I will raise the needle a notch and swap out to the next size up pilot jet and try another test ride, I've got the next couple days off work to play about with this, and this carb is brilliant to work on.

Something like this would do the job, you'll have pleanty spare at 100cm, https://www.ebay.co.uk/itm/M8-M10-M12-1-0mm-FINE-PITCH-Threaded-Bar-Rod-Studding-Full-Nuts-Washers/292737174175?var=&hash=item44287eca9f
Just select M8 diameter as it fits the drilled axles rear axle nicely. You might want to check the diameter of the drilled part of your front axles mind, I don't have standard forks and axle so it may be slightly narrower and need drilled out for the bar to work.
Also you'll probably get the threaded bar and nuts allot cheaper from a local firm, I think I only paid a couple quid if that.

@NINJA only by about 19mm