+1 on the above. Slides, needles and needle jets wear and cause running issues. No point in starting out on day one chasing carb gremlins !
Burlen do rebuild kits that contain the gaskets and o rings you’ll need too.
Does it help to fit anodized slides in worn carb bodies? Or do rebuild kits come with o/size slides, allowing for carb bodies to be machined to o/size as well? I must confess not having spent much consideration on the s/h carbs to be fitted to my bike.
-Knut