ORIGINAL: w8ye
Even the current ST carb spray bar is cut just like the GMS and tower except you can twist the ST spray bar easier than on a GMS or Tower.
Do you have any S.T. and GMS/Tower engines?
Ever take them apart?
I have...
Unless the S.T. carb has been modified within the last 3-6 months ( most of mine are older than that ) this is NOT true... I see no changes to new engines on the S.T. web site as well.
The S.T. uses a monolithic brass spray bar with a venturi vent cut into the bottom of a rectangular piece of brass stock.
If you look at the bottom of a S.T. carb you see what appears to be a slit cut into a square brass piece.
The HS needle screws into a hole from the opposite side, that closes the aperture WIDTH. The spray is pointed downward into the engine.
The GMS/Tower on the other hand use a steel round shaft nozzle, with an opposing "stopper" type L.S. needle. This is completely different and far more similiar in design to the way the O.S. carbs are built.
You cannot "twist" the spray bar on the GMS or Tower AT ALL, as they are ROUND to begin with with no preferential direcition on the opening...
SuperTigre says you can adjust the midrange by angling the square exhaust aperture, though I have found this of little to no help.