Join Date: Jan 2019
Location: Eagle Lake, FL
Year/Make/Model: 2008 en500c
Welcome aboard GAB!
Figured I'd chime in here and hopefully give some pointers that will hopefully help out.
The fuel coming out of the upper T vent (as you called it) is most likely a symptom of a sticking float or dirty needle seat. Working at the shop, it would probably surprise you to know that a good 80% of freshly rebuilt carbs will leak a little at first. As you're installing them, you tend to jostle the float around, and it doesn't seat back fully closed usually due to it being dry. The usual trick is to give the bowl a couple good taps with something hard, but not hard enough to break anything... screwdriver handle, or similar. That's the first thing to try when you first rebuild a carb and have a leak as you're describing.
Once you have this situation fixed, then we can work on the idle. With a leaky carb, it'll flood itself out and never idle correctly.
Do be VERY careful if you try to run any kind of wire through your jets, especially steel or brass wire. Your jets are made of brass, and guitar strings use a harder alloy (yes, the brass ones), and can potentially damage your jet. If you absolutely must run a wire through the jet, use ONLY copper or aluminum wire. Both are softer than the brass your jet is made of, so damage will happen to the wire itself before the jet. At the shop, we soak the jets, then blow them out with compressed air (about 90 psi). If that doesn't work, then we resort to a wire, if applicable. Often if they're that far gone, a replacement is the better bet.
To set resting float height, and do it properly, you need a special tool, with the carbs in place on the bike. You ~can~ make your own tool to use, but the carbs can only be properly checked on the bike.
Last edited by MN-Rider; 07-14-2019 at 07:50 AM.