A set of high quality TourMax carb to head rubbers to fit:

229501 Carb to Head Rubbers for Honda CB750 FZ, FA, FB, FC, F2C, FD, F2D (DOHC) 1979-1983 (set of 4)

These are also referred to as "Throttle Body Insulators".

Irregular engine running at idle is usually due to old, hardened or brittle intake manifold(s).

TourMax brand - made in Japan.

Professional installation by a qualified motorcycle mechanic is highly recommended to ensure correct fitment and safety.