bike won't run smooth when holding throttle

Yes plugged up the holes made some changes on the carbs and did a few miles won"t say it runs fantastic but it runs after more then a year building

Really good paperweights.

This thread brings to mind an excellent book by the late John Passini, which I read years ago.
It was about Weber carburettors specifically but it contained much info. about the fundamentals of carburation.

He explained that an internal combustion engine NEVER requires a rich mixture in the combustion chamber no matter how cold it is.

The reason chokes were needed was because in a multi cylinder engine with rather long inlet tracts, some of the fuel vapour condenses on the internal surfaces of the manifold when the engine is cold, resulting in a weak mixture in the cylinder.

On our Nortons with their short inlet tracts, the choke is pretty much superfluous.

The choke on my bike must have been removed long before I acquired it. I have never felt any need for it.

Cheers
Martin

What is kind of strange about this thread is my bike won't run with the choke on. It starts to chough and sputter...so you really didn't get the proper engine signals to warn you the choke(s) were on. I wonder if your running lean on idle?

My bike runs fine with the choke on, but it bogs down when giving it throttle.