Hi all, this is my first post so please bear with me.
I own a '75 CB400F which I rebuilt from a barn find. These are the details:
-Engine: standard bore
-Carbs: Standard, Fitted pods, jet 85 and pilot jet 38
-Exhaust: Marving 4 in 1
-Ignition: Electronic (Kokusan from David Silver Spares UK)
I rebuilt the engine using a complete set of seals and gaskets, new piston rings, carbs were cleaned and overhauled, new standard piston rings. After all the long work and following Haynes manual instructions I cannot manage to get the engine to get a proper idle, I synced the carbs with vacuum gauges, adjusted the floats to 21mm as per manual, cleaned everything adjusted electronic ignition timing as per manufacturer's. One thing I noticed is that on one of the carbs the air-fuel mix screw will go deeper on the thread compared to the others if you screw it down to the bottom before adjusting it to 2.5 turns. I was thinking that this might cause the whole syncing to be messed up or perhaps I have a vacuum problem.
Any ideas?? This is driving me potty!!
Many thanks
