Yes the bike is very very clean and all original only thing I have changed so far are I put a round headlight on it, the rectangular one just did not look good to me,shortened the turn signal stalks and bolted the gauges on from the underside of the triple clamp to lower it about a half inch also replaced the steering head bearings with the timkin kit from all balls,I like the carb even though I have not worked on one like it but dang near every other type I have worked on round slide flat slides lectron flatside with power jet ect but none like the ft one.I will rejet to the specs you recommended,you might be able to put a small shim under the needle say maybe ten thousands this should help the mid range I have done this on diafram type carbs a lot and you can dial in the midrange jetting.I have a good spare carb that came with parts bike that was part of the deal when I bought it so I am going to take it apart and check out the innards lol rebuild it and jet it and then swap it with the one on there now.I will use a sixteen tooth sprocket like you recommended, took it for about a 40 mile ride today and and it could use it.Also popped for the stock Honda service manual I found on ebay dang payed through the nose for it 95 bucks but I know from working for many dealers and shops the factory manual is so much better than any others by a long way not even a comparison for the most part.Maybe the spare parts bike I got in the deal I will turn into a full blown street tracker,already have a spare set of progressive shocks that are the right length just need a set of springs,my vintage dirttracker got the springs when I changed the shock length on it,also will do the front springs the stock ones are pretty sorry lol stainless brake lines too.