Brum Speedo Trip Reset

[Russell]

Can anyone tell me how you reset the trip on my 58 Brum speedo…
[attachment=0:9e48tqf0]WP_20180728_07_46_42_Pro.jpg[/attachment:9e48tqf0]
I guess there should be a knob or cable somewhere but can’t see one 😕

[Tman]

Dunno about yours specifically, but similar nacelle’d BSAs had a short cable protruding downwards for the trip. Looked horrible, which is probably the reason for their rarity today.

[Stan Thomas]

Unless your speedo has been made up from bits using a “non-trip” case which will not have a trip cancelling spindle projecting out of the bottom of the speedo case, the following applies:

As the previous post says, there should be a knob under the headlanp shell poking though a rubber grommet under the headllamp shell – although if it is the correct length, it is only really visible by looking under the headlamp.

Remove the headlight/reflector unit, and you should see a short spindle projecting through the bottom of the speedo case. If so, you will need to measure the length of “trip re-setting” cable required from any of the speedo services who advertise on the ‘net – as they are easily obtainable.

[Russell]

Hard to tell from this photo, but I can’t see anything but the main speedo cable and the wire for the speedo light, does that mean it doesn’t have a trip reset fitted ?

[attachment=0:2u4yw0gq]speedo.jpg[/attachment:2u4yw0gq]

[dave bushell]

Check the left hand side of the speedo casing (viewed from underneath) as this is also a trip spindle outlet on some speedos and someone may have fitted a replacement of the wrong type. Also, as Stan said, it my have been built up using a non trip case

[Russell]

I guess it must have a non trip case as I can’t see anything !

[Stan Thomas]

If the correct “trip connecting spindle” is present on your speedo, it emeges from the case about midway under the purple wire between the blue and brown wires just left of the knurled drive cable connection on your photograph.

As Dave says, some speedos have the trip connection emeging from the side of the case – these speedos are for when it is mounted separately not integral with the headlight. However, all the internal parts of the speedo are modular insofar as you can change them easily (although delicately) to build up a speedo for a specific application, and there are of course specialists who can do this for you.

[Russell]

I can’t see any spindles, so guess it must be a non trip case 😕

[attachment=0:37d2wnyv]WP_20180803_21_17_24_Pro.jpg[/attachment:37d2wnyv]

[Oldguy]

Two variations on that theme.
1, the side mount:
[attachment=1:3np505rz]IMG_3798.jpg[/attachment:3np505rz]

2 The bottom mount:
[attachment=0:3np505rz]IMG_3800.jpg[/attachment:3np505rz]
Yup that tiny protruding stud on the right edge —

[Russell]

That was useful, definitely nothing on the bottom of the case, but there does feel as though there is a hole where the side mount goes. So is it possible to convert to a rear mount, and is it a specialist job?

[Oldguy]

It is certainly possible, you would need to send to one of the specialist repairers.
One such is: https://www.speedorepairs.co.uk/
There are others but I have had good service from Ashley at the above.
Perhaps other folk on this forum have there own pet people so more ideas could be forthcoming.
You could do it on a diy basis if you can get the bits —
There are some good websites on rebuilding the chronometric speedo too.

[Author]

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