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Hey Anon,, WHY are you needing to replace the carb?? In my 40+ years of being a motorcycle/atv mechanic, I have only replaced 3 carbs,,,and CLEANED and repaired HUNDREDS AND HUNDREDS. reply to me on here.... I'll help you
1. trash(including rust in the tank if metal) in the tank/carb. If the carb set for more than 6 months it may need the fuel system cleaned out(includes the carb). Putting a filter in the system will not take care of the rust problem in most cases. If the tank is metal and has rust it will need a tank liner kit like the brand "kreem" or the equivalent.
2. the needle/seat combination and/or float is incorrectly set or bad causing that fuel level to get high in the bowl. Check the float height according to the manual or replace the float/needle/seat.
3. bad seat o ring if it has one and also a petcock that does not shut off. If you can jog the seat around in the carb, then the o ring is probably bad. If you disconnect the fuel line from the carb and gas still comes out, the petcock is most likely bad or it has trash in it.
If it's the Sreamin' Eagle Mikuni, it should come jetted close enough to take your bike to someone with an exhaust gas analyzer. That's the best way to get your card jetted correctly with the extensive amount of changes that you have made on this bike. I would advise that you take the bike to someone that has a dynometer that is equipped with an EGA and have the run the bike up. I would not want the mixture to exceed 14:1 at any time and preferrably run about 13.5:1. It's a bit on the rich side but it will help keep your engine running cooler. I've installed the carbs before but I cannot remember what jets they had in them. Sorry. Good Luck.
The stock harley choke plunger will not work on a Mikuni carb! It causes the carb to run rich all the time! You can go to a GOOD Indy in your area and order the Mikuni plunger. It is listed in the DRAG book