> I have noticed that a
> change of just .001" seems to make a big difference, at least in how
> smoothly it idles.
That's odd. I've very little experience with the 6-pot Triumphs, but on my
TR3 it takes at least .003-.004 to make any noticeable difference, and even
then it's not much.
> Carbs are HS4 SU's
> with individual K&N air cleaners. That's what it's had since I
> bought it.
Hmmm. Any chance some previous owner has installed a performance cam ?
They usually sacrifice idle quality for more high-end power. They also
frequently require more valve lash than the stock cam does, which might
explain why your engine is so picky about lash.
> As for my emission testing equipment, that's my nose. And the state
> of my clothes when I get to where I'm going after idling at enough
> stoplights. All very hi-tech equipment, you know.
Not much to work with, unfortunately. What happens if you go say, 1/2 turn
leaner on both mixture nuts ? Or raise the idle rpm by 3-400 rpm.
I assume you've tried fresh plugs, plug wires, cap, rotor, points, condensor
...
Randall
_______________________________________________
Support Team.Net http://www.team.net/donate.html
This list supported in part by the Vintage Triumph Register
http://www.vtr.org
Triumphs@autox.team.net
http://autox.team.net/mailman/listinfo/triumphs
http://www.team.net/archive
|