The vin tag says 3 of 1986 I did check the slides and they are in fact drilled so I am now assuming it's a Dyno jet set up, i dissambled the carbs, needle and seats pilot jets main jets ,choke plungers, polished the slide bores polished the slides( they were hanging up) put it all together with needles in the 3rd clip with one washer under the needle,40 pilots 130 mains and 2.5 on the fuel screws, the bike had 35 pilots and 125 mains needle in #2 ,and it felt lean especially in the mid range, I also have a square hole in the front of the air box between the two snorkels ,maybe 4X4 inches and a KN filter, also have aluminum F1 mufflers, sooo I just started the engine and WOW throttle response is instant! Way better than it was! Finally I think it's the monster it should be, Verry Happy now, was quite a learning curve to do the carbs took me 6 hrs start to finish, so glad I did!