Will a carb rebuild fix this?

1.8 L honda 34mm keann carbs.Altitude adjusting via all vacuum lines 1984 to 87dx models they just get old and they have plastic floats 1 carb.1 float set they are a discontinued oem part they will fill up with gas and sink causing them to flood.Find some old stock float sets and carb.kit should fix right up.Maybe some one out there makes custom carb floats out of brass???That is what they need!!!!

if the carburetor keeps flooding out, the float could be stuck in the up position. tap lightly on & around fuel reservoir to free. depending on age of carburetor, you might need to put in a carburetor kit.

Sounds like your float is stuck and your needle will not come off of the seat. You need to find someone that is capable of rebuilding your carburetor or replace it.

make sure all filter r clean or new

Check that your choke is working properly.
Start with a tune-up, new gas filter, air filter if dirty, oil and oil filter, spark plugs, distributor cap and rotor. If your spark plug wires are old, buy a new set, or test yours with an ohmmeter.
If still bad, check if your fuel pump is putting enough gas into the carburetor. Take the gas line off at carb. and check volume flow into a container. Also the carb may need adjustments-maybe the fuel level in carb. bowl is too low-would need to raise float height. Check if the needle valve and seat at the gas inlet to carb is not clogged or stopped from trash or debris.
Look down the throat of carb and watch for gas jetting out when you open the throttle to wide open-you should see gas spurt downward, if not, the carb needs some work to it.
Is your choke adjusted right? Sounds like it may not be-the choke flap should be nearly closed when starting, partially open after running, and fully open after the engine warms up.
Other problems could be weak ignition components-possibly a coil or igniter-what Toyota calls an ignition module.
Post back with what you find. Webers are great carburetors-much better than stock.

It sounds like the float inside the carb is stuck. For an immediate fix, I've read that you can tap lightly on the side of the carb with the plastic/rubber handle of a screwdriver to loosen the float. However, in my experience with my '72 Cutlass, the issue will reappear (it's getting stuck due to gunk in the carb) and could cause an engine fire --imagine the gas pouring onto a hot engine block. It's time to rebuild/replace the carb.

Disconnect the carburetor from the gas line, and rebuild it, blowing out the jets with compressed air, and adjusting the float so that it will allow gas to flow into the carburetor bowl.

You can adjust the carburetor with a straight blade screwdriver.Remove the air cleaner and have someone push the gas pedal,you'll see a lever connected to the carb moving back and forth,this is the accelerator linkage.While looking straight at the linkage you'll see a screw between the linkage and the carb.Using the straight blade screw driver turn clockwise a quarter turn.Replace the air cleaner and start the engine.The RPMs should be higher, now hold the brake pedal and put it in gear.Stays running,your good to go,otherwise give her another quarter turn.Now this is a "get-by"solution,you need to give some attention to your engine by giving it a tune up!That means changing:distributor cap&rotor,spark plugs&wires,carburetor rebuild,oil change and lube.Oh yeah,tighten down the four 1/2" bolts holding down the carburetor too!You could have a vacuum leak under the carb or even a vacuum line disconnected.This will also cause the low idle speed!Good luck!

Wow, sounds like head gasket &/or timing problem. First thing you need to do is a pressure test on cooling system to see if head gasket gone, then I'd do a compression test as well. Have you pulled any spark plugs to see what they look like?

Hold the gas peddle to the floor when starting. The carb does not add fuel until the engine is running. Don't pump it as the accelerator pump will pump fuel each time you do it. Cause of problem is your float inside your carburetor is not seating correctly and "dribbles" fuel while your pump runs. Basically it is leaking inside and needs rebuilding..