Shimano STI function

I've just rebuilt an old bike with Ultegra parts and a 12-27 cassette.
Everything works well after careful adjustment, except that I cannot get
a click shift onto the 24 tooth cog. I can pull the chain onto the 24
tooth cog manually or by holding the shift lever, but there is no click
detent. Is this normal with this cassette or is the lever
malfunctioning. I've followed Sheldon Brown's recommendations about
adjusting tensions, and the limit screws, the B screw and all other
things seem correct. Any help gratefully appreciated.

--
Bob Wheeler --- http://www.bobwheeler.com/
ECHIP, Inc. ---
Randomness comes in bunches.

bwheller- I've just rebuilt an old bike with Ultegra parts and a 12-27
cassette.
Everything works well after careful adjustment, except that I cannot get
a click shift onto the 24 tooth cog. I can pull the chain onto the 24
tooth cog manually or by holding the shift lever, BRBR

Disconnect the shift lever and ensure you have 8 clicks in the lever(9s). If
not you either have a 8s lever or the thing is history. You can also try to
flush with WD-40.

Peter Chisholm
Vecchio's Bicicletteria
1833 Pearl St.
Boulder, CO, 80302
(303)440-3535
http://www.vecchios.com
"Ruote convenzionali costruite eccezionalmente bene"

bwheller- I've just rebuilt an old bike with Ultegra parts and a 12-27
cassette.
Everything works well after careful adjustment, except that I cannot get
a click shift onto the 24 tooth cog. I can pull the chain onto the 24
tooth cog manually or by holding the shift lever, BRBR

Disconnect the shift lever and ensure you have 8 clicks in the lever(9s). If
not you either have a 8s lever or the thing is history. You can also try to
flush with WD-40.

Peter Chisholm
Vecchio's Bicicletteria
1833 Pearl St.
Boulder, CO, 80302
(303)440-3535
http://www.vecchios.com
"Ruote convenzionali costruite eccezionalmente bene"