Weber throttle by-pass settings
Posted: Tue Aug 03, 2021 1:31 pm
I fitted a set of Spanish made Weber 45s some time ago.
They are running very well.
I have just been trying to fine tune the idle speed. The idle mixtures are perfect, the throttle return springs are new, the linkage rod adjustment is correct, the idle speed adjuster is off the stop, and the throttles plates are fully closed.
But the idle is still too fast, around 900 rpm. With previous carb sets I could get it down to a much lower speed
On this set of carbs there is a throttle py-pass port on each barrel, with an adjustable needle-valve and locknut, located just below the pump jet, see pic I cannot find any information on setting these, I seem to remember seeing something about these being factory settings and not to be adjusted.
Before I start experimenting, has anyone any ideas ?
They are running very well.
I have just been trying to fine tune the idle speed. The idle mixtures are perfect, the throttle return springs are new, the linkage rod adjustment is correct, the idle speed adjuster is off the stop, and the throttles plates are fully closed.
But the idle is still too fast, around 900 rpm. With previous carb sets I could get it down to a much lower speed
On this set of carbs there is a throttle py-pass port on each barrel, with an adjustable needle-valve and locknut, located just below the pump jet, see pic I cannot find any information on setting these, I seem to remember seeing something about these being factory settings and not to be adjusted.
Before I start experimenting, has anyone any ideas ?