[TR] SU H6 throttle shaft bushing replacement

[John Reed]

It's time for me to replace the throttle shaft bushes in the SU H6 carbs on my
TR3.  They're leaking a bit and I can't get my idle speed below 1200 RPM.
Otherwise no problems with carbs and it runs great.  In the early 90s when I
rebuilt the carbs I got the throttle shaft and bush kit from Moss and had a
shop in Cincinnati ream out the bodies and press in the bushes.  I'm trying to
decide how much work I should do now.



Should I just get four new bushes from Moss and not replace anything more?
Hoping the wear is in the bushes and not the shafts.



Should I put in new shafts also?  Will I be able to use micrometers to tell if
there is wear on my shafts?  My concern with replacing the shafts is drilling
them for the pin to locate the throttle stops.  Any tips for doing that?  I
have a drill press.



Should I install a complete rebuilt kit even though I have no other problems?
I've only got about 25000 miles since the rebuild.  But is 17 years getting
near the end of the life expectancy for seals?



The shafts that are installed measure 5/16" (.3125").  I'm hoping that is the
standard shaft size and the OD of the bushes Moss sells now is the same as
those sold 17 years ago.



thanks,

John Reed

1957 TR3