Carb Overflowing & Hanging/Surging Idle

[GuyS]

I set mine at 24mm which I verified correct by using the tube to float bowl drain method. The fuel level was 3mm below the float bowl/carb joint. I have the DOHC with the BS34 carbs.

 

[Deltic]

My heads been spinning lately & I need some help figuring out my problem here...

I've been having an issue with the carbs overflowing, not right when I turn the fuel on, but after about an hour or so it's start pouring out of both sides...

I've changed the float height to 26mm, tested the float needles to make sure they were sealing (which they are) but they keep on overflowing.

And yes, im turning the petcock off its not sitting in prime.

Im thinking my issue might be a faulty petcock? I'm running out of ideas I've went thru these carbs almost 10 times & they are squeaky clean

Now I'm having an issue where I kick start my bike the first time and it starts, not amazing because I haven't balanced them yet, but the right cylinder isn't firing correctly.

So I shut the bike off, try to kickstart multiple times, then theres no spark.

Texted both sides by holding onto the engine to see spark and nothing... these are brand new NGKs btw



Faulty coils? This is a brand new battery so no way it not getting enough power.

Send help before I lose it lol. Sorry for the long thread.

I had the same problem. There were two faults causing the carbs to flood; the first the petcock had been assembled wrong and was still allowing fuel down to the carbs when the engine was shut down. The petcock, the plastic spacer between the two diaphragms, there is a front and back. Get it back to front and it doesn't stop the fuel flow when the engine is stopped.

The second, one or both carbs float valve were allowing fuel to overflow the float chamber and flood the inlets and cylinders.

The float valves were both renewed.

This solved my problem.