What you describe sounds like flat-spotting, which can be caused by
insufficient damping of the carb pistons when accelerating. It can also be
caused at a steady throttle but an increasing load by incorrect needles
being too weak in mid-range but that is usually 'corrected' by richening,
either by adjusting the jets or pulling the choke slightly, what does
pulling the choke do?
Fuel pump is easy to check, disconnect a delivery pipe from a carb and
direct it into a container. With the ignition on it should deliver at least
one Imperial pint per minute, and in practice closer to two, in a steady
stream of pulses with minimal bubbling. That's the spec for an SU pump, but
if an after-market doesn't deliver at least that it isn't up to the job.
What's the tach doing when this is happening? Steady or jumping around?
PaulH.
----- Original Message -----
> When cold its ok or driving around town with a constant variation of revs
> but once I start to cruise along with revs at say 3300 and then I try to
> accelerate I have hesitation, at time severe, it also seems to be brought
> on if I go up a hill as driving at steady rev level
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