> i've checked my spedometer against my gps. the speedo is low 9mph
> across the range. there was a small speed adapter thing on the back of
> the speedo but it broke. bought a new cable. what could you guys
> recommend to fix this ? the speedo adapter adapter thing is american
> not british (internal cable is larger, nut/thread is larger) so it does
> not fit without two other adapters, one for each side. this all seems a
> mess to me. do all triumphs or gt6's have to have this adapter ? do
> one of the catalog co's (trf, sb, vb) sell the correct british adapter ?
Larry, the adapter is non-original, but is a common solution to speedometer
calibration problems after changing tire diameters and/or drive ratios. I
would guess that some PO has changed the differential gears to a 'taller'
(numerically lower) ratio, and gone to a speedo shop to get the adapter.
If it's truly a 9mph offset at all speeds (meaning your speedo reads 0 when
you are doing 9 mph), you can just move the needle on the shaft as outlined
in Tony Rhode's article.
If however, the offset is a constant percentage, and the odometer is
affected by the same percentage, then another adapter is a good solution.
Call around to the speedo shops in your area, I'm sure one of them can make
you a new adapter. Last one I talked to wanted about $45 for it.
Or, I believe a rebuild shop like MO-MA can build it to whatever ratio you
need. You'll have to tell them what that is, of course.
Randall
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