I haven't been happy with the power of our (daughter & me) '76 TR6 for some
time, especially its reluctance to continue to rev much beyond 4K rpm, even
tho it has mild mods like cam, head milled, header, Monza, etc.
Today I was checking the timing and plugs, and also adjusted the mixture on
the ZS carbs, which were running a little rich. After resetting them I
decided to see if right-foot WOT was really opening the butterflys fully. I
had checked the linkage previously , of course, but always at the carb
linkage end of things.
I found to my surprise that when the accel pedal was fully depressed against
the stop that the throttle plates were only opening about 3/4 of full
throttle, and the linkage was not hitting the stops on the carbs, though it
could be made to do so with a manual assist at the carbs. So I shortened the
long adjustable rod by just under 1/2" and got full throttle consistently.
No effect on idle speed.
Needless to say, when I took it for a short test ride it was a major
improvement. Acceleration thru the first 3 gears was MUCH more impressive,
and it winds readily to 5500rpm now. Responds much more vigorously when
punched at any speed.
Apologies for the long post, but I had to pass it along.
Tom
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