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@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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