To start with...4 turns down?
you should be starting with both jets about 12 flats down.
You could also simply measure the jet below the bridge
at 0.060" for the initial setup.
Check that both needles are properly set with the
little shoulder on the needle, perfectly level with the bottom
of the damper piston.
Make sure your interconnect linkage is not limiting you
from properly setting the idle stops and that the high idle
stops on the choke levers are not holding the idle throttle
position from sitting on its proper idle stop screw.
If this still fails, you could have a piston sticking.
Try cleaning the shaft of the piston that slides in the
dashpot as well as the dashpot 'tube' in which it slides.
It doesn't take much to stop it from lifting properly.
A simple test to see if both are pulling equal amounts of air
is to use a short length on gas hose as a stethoscope
and listen to the sound of the air rushing into the carbs.
It's relatively easy to notice even a slight air speed difference
in sound.
Good luck and let us know what you find. I just did this myself,
and still retained the carbon canister breathing system and
associated plumbing that the old ZS setup was using.
pics at
http://www.teglerizer.com/triumphstuff/75w_carbswap.htm
Paul Tegler ptegler@gouldfo.com www.teglerizer.com
----- Original Message -----
From: "Chris DeStaffany" <destaff@yahoo.com>
To: <spitfires@autox.team.net>
Sent: Monday, March 26, 2001 12:20 AM
Subject: SU transplant
Spent the weekend transplanting a set of HS4s into the
75 1500. This is a good used set that I checked for
trottle shaft wear. There was none measurable. It got
dark so I had to stop working. It starts and runs but
sounds like it is missing on a cylinder even though it
is not. The rear carb is pulling well but the forward
one is not doing much. If I richen it up blocking the
air by putting my hand over the intake, it runs well.
I get a little gas back on my hand after about 20
seconds. I've dropped down the jet to about 4 turns
from the top, but it doesn't seem to be doing
anything. Any Ideas out there?
Chris DeStaffany
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