Nope no advancer rotor as yet, bikes starts ok as is, runs mega.
Saying that though, I'm considering trying a 4 degree rotor or modifying my OEM rotor next time casing needs to come off.
As Teeccee advises, defo replace float valve seals as a minimum, there's also a fine mesh gauze filter in there too that needs a good soak in brake or EGR cleaner,.
Personally I replace all O'rings in the carbs, including float bowl seal.
Since fitting my Ivans MB kit, I've come across discussions in this & other forums about pro's & con's of drilling 1 or 2 pilot holes, 2 being as per Ivans recommendations, I have no experience of trialing another set of carbs with 1 pilot drilled, so I can't say if 1 drilled is better than 2 drilled ... best person to ask would be Falcon on this forum as he's spent god knows how many hrs ripping carbs apart & tinkering away fitting Jet kits for owners less capable, but if you've got a methodical approach, pulling carbs is pretty easy to be fair.
One thing or error I've come across fitting the MB kit, is there's no mention to strip the carb bottom ends before drilling pilot holes, to me it's common sense to fully strip the carbs 1st, tiny bits of alloy swarf will end up in the carb passages if not, also no one ever mentions separating the carbs to inspect or replace the "Air cut valve" diaphragms, only 1 can be accessed with carbs together, 3 can't so they need to be split apart, seems it's an often neglected part on these Mikuni's, bike won't run correctly without them being in good order, plus you can't fully clean out the carbs effectively with either an ultra-sonic bath or solvents, Solvents will likely damage the diaphragms, I believe they're no longer available from Yamaha, plus they'd be silly money too ... "Ali-express" is you're friend here, £15 posted from China for a set of 4 diaphragms, comes with new springs too, look identical to OEM items, same parts on ebay at £60 plus, so do yourself a favour if planning on doing the MB kit, order a full set of carb seals or "Tourmax service kit, ideally replace the float valves too, some kits come with em.
Also ensure the 2 carb vent gauze filters are spotlessly clean or you'll get poor idling or no idling, fuel starvation symptoms, these sit inline between the carbs on short hoses & vent to atmosphere above the air box (often neglected) & need a regular wash out with brake cleaner or petrol.
Most bin the "Pair" system too & block off the header tubes ('mines long gone)
Fit a set of new plugs too, older bikes seem to dislike Iridiums.
MB kit's not a cheap mod, but neither is it mega expensive, always a plentiful supply of used exhaust cans on sale on eBay or F/Book, I've done all the above & not had any probs with the carbs or the bike in general since, bit of tweaking to pilot screws may be needed but that's all.
Modifying throttle tube to 1/4 turn makes life easier too.