The earlier type HS carbs with no idle circuit are meant to be adjusted
that way, with the "idle screw/throttle adjustment" method.
The SU company did improve the design for the more common type HD carbs.
The manufacturer did not provide an "adjustment" device. What they
provided was a throttle stop that is meant to be actuated by the use of
the "choke"
If you are using the throttle plate method you have effective lessened
the effectiveness of the choke circuit.
When the carb is adjusted properly, pulling the choke part way is
supposed to lower the jet slightly without opening the throttle.
Pulling the choke futher then opens the throttle a bit for "fast idle"
So now, if you have your throttle stop holding open, when you pull the
choke, you are opening the throttle and lowering the jet at the same
time.
Rick
San Diego.
On Jun 18, 2004, at 7:14 AM, frogeye wrote:
> OK you guys...IF the throttle stops have no purpose, as the majority
> seem to
> believe, then WHY did the manufacturer even bother to provide an
> "adjustment" device when a simple non-adjustable stop would have
> sufficed?
> Dave
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