[TR] Carb Questions

[wbeech]

Good day List,
 
Preparing rebuild my older pair of SU H6 carbs, AUC768, and am trying to
find the tolerances for the throttle shaft (butterfly shaft).  In other
circles I have heard about bearings and reamers to correct any issues here
but upon initial inspection I do not find any type of bearings in the body
for this shaft.  I measured the play using a dial indicator in the center of
the carb throat and I can lift the shaft .002, but I don't know if this is
good or horrible???
 
I have the Speed Sport book "Tuning SU Carburetters" that is nice but no
data other than lots of needle charts.  Which brings the second question:  I
live at an elevation of  6,000ft, the needles in these carbs are "SM" which
is the standard needle according to the the Bentley's &   Moss catalog,
Haynes says TESM.  Should I be using a richer needle to compensate for the
elevation?  I am not racing or tuning for high performance.
 
BTW, all this should leave me with a spare pair of Stromberg 175s should
anyone be in need you can contact me off list.
 
Thanks to all,
 
Bill B
'58 TR-3A TS/30766 L
'59 TR-3A TS/64974 LO
"A Triumph is man's best friend, it always comes when it is called...of
course, some times it is difficult to make it go"