The clutch engages farther out on these bikes, makes people uncomfortable who are used to what they are used to, nature of the beast
That loud noise when shifting could be and most likely is clutch adjustment. Properly adjusting it will alleviate that mean clunk/clash. Slacken cable by screwing adjusters in at engine and lever. Loosen lock nut and turn CW til resistance is felt. Back ~1/4 CCW and tighten down. Adjust at engine and fine tune at lever for only like 1/8" or so of lever slack.
Does it have a stock airbox? Don't worry about that carb stuff now until you have cleaned them real well, not just carb cleaner squirts, but real cleaning. General consensus is clean and re-use your brass parts because they are usually "better" and just use the gaskets.
You want some real help list carb numbers off the carb like o69b, stuff like that. Your top left search bar is the greatest resource because I can guarantee you can find an answer to just about any question. Then you can ask more pointed questions people will answer better for you
Welcome, post pics or we will shun you
