Hi, my zx6r is playing up. weve striped the carbs, cleaned the float needles and carb needles, but the carb s is still being flooded, even when the engine is turned off pleeeese advise, as this is the 7th time in 4 days weve had the bike apart to try and sort :(

it sounds like it is still you needle and seats are worn or your float has a hole in it just check the float and see if it has fuel inside it ,but i say a new set of needle and seats and bowl gaskets cheers

Flooding carbs often means that the needle valve that the float is supposed to close is leaking, causing the float chamber to overflow. replace needle valves.

more information. was the carb removed from the car, when you say clean, was it taken apart. float/needle valves/etc. flooding is usually caused by the needle valve not properly reseating when the bowl is filled. how do you know that the carb is flooding.

Stuck float valve, letting too much fuel into the carb. Try taking the bowl off of the carb and checking to make sure that the float needle moves freely up and down. If there is evidence of gumming inside the bowl you will want to get some spray carb cleaner and clean everything in there thoroughly.

You need to remove the fuel bowl and check the float and needle valve. Possibly clean the carb.

The timing has not changed just because you cleaned the carb. If it's flooding, the needle and seat are not sealing like they should. If this is the case, you should be seeing fuel coming out of the overflow tube when the engine is not running or the fuel flowing into the carb. You didn't mention what type of carburetor you are running on the engine. The original Keihin carb is notorious for doing this. I've worked with them all day long trying to get one to quit flooding. It's as if when you clean the carb and take the float out, if you rotate the needle or something, it just will not seal. I've had to lower the float setting on many occasions to get it to stop. Do not lower the float setting over 1mm.(0.040") as you may start to starve the engine for fuel at highway speeds. If the carb is an S&S carb. Check the float setting with the bowl held upside down. It's shoudl be 1/8" into the bowl from the gasket surface. If it's a Bendix carb, you may not have the float spring in the carb correctly.

Good Luck
Steve

From your description we will assume it is flooding. If you suspect float problem, check float level, holding the carb upside down the float should be parallel to carb body when needle seat is closed. On metal floats this is accomplished by bending the tab that rides on the needle, units with plastic floats you may have to replace it. Also remove float and shake it, should not be any gas in the float, this will make it flood. Also set carb adjustment screw at 1.5 turns out, may need a little tweek from there.

Sounds to me like the float needle valve in the carb is leaking. This will cause fuel to over flow out of carb, and will even get into the engine oil. Check to be sure that float is not got gas in it the can go bad. Also check float adjustment. Check needle and seat very carefully for dirt or wear. Just the slightest bit of dirt or wear can cause it to leak. Hope this helps.

The fuel is probably flooding due to trash in carb, remove the fuel bowl,clean float needle,clean jet and the orfaces in it.(if dirt is in it clean the rest of the fuel system to keep it from happening again.) Spray cleaner does good.

Then there likely is still trash in the carb.

Or, it could also be that the tank vent is clogged, and not letting fuel vapors be expelled from the tank. As fuel heats up, vapors are created, which pressurize the tank, which can force fuel through the carb past the float / needle.