[Roadsters] Seals for bearings on SU's

[Keith0alan at aol.com]

Sounds like it is running lean at the top end. What needles did you put in  
them? Check with the current Z-therapy folks about the throttle shaft seal  
problem. They didn't own the company when the work was done but they might 
still  sort them out for you. 
 
keith williams
 
 
In a message dated 3/8/2011 3:09:42 P.M. Pacific Standard Time,  
shas1983 at netzero.net writes:

I have a  set of SU' that were rebuilt about 10 years ago by Mike Poorboy 
who  I
believe formerly owned Z therapy.They have sat in a box never installed  
until
last spring. Everything was replaced including roller bearing shafts  which 
I
thought were sealed. I took some carb cleaner one day and  discovered that 
the
bearing were not sealed. Getting carb cleaner anywhere  near the shaft
instantly shut the carb down. I found out after the fact  that these were
supposedly set up for racing, with no springs and different  needles. I have
added springs and replaced both the needles and the  jets.  I have never 
been
able to get these to work well without  running heavy 40w oil in the 
dashpots,
which I am speculating is due to the  air leakage around these bearings. 
With
this oil, I get good response in  low gears and at lower speeds, but once 
over
80 mph they want to bog when  pushing the throttle heavily. I can only gain
speed by gently applying the  throttle and waiting for the speed to 
gradually
increase. t seems to me  this may be the result of the heavy oil not 
allowing
the pistons to open  enough for adequate air/fuel at higher speeds. Does 
this
make sense? Can I  be over compensating with the Heavy oil for the airflow 
to
the point that I  am sacrificing high end? Not sure if the floats could be
impacting this as  well. I set these using a drill bit as a guage as 
described
by others, I  have noticed a tendency on even minor inclines to loose
acceleration. The  engine has good compression, electronic ignition,.etc so 
I
am left  believing it is somehow related to the carbs. Any help would  be
appreciated.
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