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Have you ever replaced the oem fuel hoses going to the cabs? As the fuel hoses age they tend to get stiff and then they begin to leak because they lose their grip on the fittings. Check the fuel hoses before you do anything.

Even though this is for link is for Keihin carburetors this will explain and help you properly jet your carburetors. When it comes to jetting your carburetors it takes a lot time and plenty of patiences to get them properly tuned. https://static1.squarespace.com/static/5be4d5b35ffd2095efa9bdff/t/5bf1a09b6d2a7391b5a84730/1542561947962/KeihinCarbJetting-2015.pdf

Even though this is for link is for Keihin carburetors this will explain and help you properly jet your carburetors. When it comes to jetting your carburetors it takes a lot time and plenty of patiences to get them properly tuned. https://static1.squarespace.com/static/5be4d5b35ffd2095efa9bdff/t/5bf1a09b6d2a7391b5a84730/1542561947962/KeihinCarbJetting-2015.pdf

What’s your outside temperature and humidity? Sometimes just a little bit of change in elevation can make a difference as well. These 3 factors listed above play a huge part in your jetting. What are the current carburetor settings mains, pilots, clip on the needle and how many turns “OUT”on the air screw from the seated position? What type of fuel are you using and at what fuel/oil ratio are you using? Please report back with more detail information.

These people say that they have 4 in stock. I don’t know how true it is but this might help. https://www.unitedoutdoorsupply.com/product/keihin-jet-needle-cel/

Give this company a call. I’ve used them in the past for the hard to find keihin carburetor parts. http://www.pjmotorsports.com/index.html

When you had the 30 pilots in did you ever try it with the air box lid on ? What type of riding conditions are you riding in that requires the air box lid ?