All
Is everyone aware that there are reprints available from original SU
publications? For example britishtool.com has a reprint of AUC9600A.
It's the Su Workshop Manual and covers H, HD, HS, HS2, and HV carbs
along with L, HP, LCS, and PD fuel pumps. A copy of this or one of the
generic carb books should be part of everyone's manuals including the
factory one specific for your vehicle.
For example the following information describes the use of the spring
inside some carbs.
Blake
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The majority or current body castings incorporate a throttle edge union
(27) for actuation of an automatic ignition control, and on certain
carburettors (generally single-ca.rburetter layouts for six-cyUnder
engines) there is an additional similar pipe and union fitting for
actuating what is termed the 'weakening device' providing a weakened-off
mixture for part throttle cruising when the engine is pulling against a
light load. This fitting cannot be suppled except as car manufacturers'
original equipment owing to the complicated tuning problems involved.
The weakening device is dealt with in Section A.S.
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