Wildguzzi.com
General Category => General Discussion => Topic started by: nwguy on May 15, 2025, 03:37:29 PM
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The thin brass threaded shaft inside my Bassa's speedometer housing that accepts the female threaded reset knob is only about 3 or 4 mm long. I suspect that it somehow broke off leaving that little stub. The new knob doesn't tighten on the threads because there aren't enough of them. I did read that it's reverse threaded.
How do you operate the reset button when it's installed and works? Turn it counterclockwise?
I'm wondering what I could do to make it operable. I read someone crazy glued on a thin straw from a spray can. Maybe I could crazy glue on the new knob. I ask how it works so I know where to not apply any adhesive if I do try gluing the knob on.
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I have a similar issue on my 1981 T3 California - the knob is missing and none of the replacements that I have found are the correct diameter/thread. I haven't wanted to try gluing something on because you have to remove the trip reset knob to remove the gauge from the dash housing...
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Reset is accomplished by rotating knob anticlockwise until all numbers are moving and match. Stop at all zeros.
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What about a small length of rubber hose, of suitable diameter? A dab of silicone sealant to afford some protection from the knob popping off. Some trip resets use this method (or plastic tube) as standard.
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I have a similar issue on my 1981 T3 California - the knob is missing and none of the replacements that I have found are the correct diameter/thread. I haven't wanted to try gluing something on because you have to remove the trip reset knob to remove the gauge from the dash housing...
This is the one I bought (says it fits Bassa):
https://www.mgcycle.com/index.php?main_page=product_info&cPath=276&products_id=86
I hadn't thought that maybe it's just the wrong I.D. I should take the housing off and re-evaluate why mine's not threading on. Here's a view through the housing hole of the threaded stub.
(https://i.ibb.co/JWTsfWsS/Trip-Reset-Stub.jpg) (https://ibb.co/JWTsfWsS)
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I contacted Joel Levine who repairs Veglia gauges in GA. He says:
Moto guzzi veglia speedometers with the side trip meter reset knob came in either 3mm left hand thread or a 2.5mm right hand thread.
What you have probably is a 3mm inside diameter.
When we have those gages for repair and need the knob we make them on a lathe and blend the cost into the full repair cost.
The least expensive way is for you to find one for a 2.5mm thread.
We could make one but there is a $75.00 minimum charge.
I contacted MG Cycle and suggested they change the description text for the knob they sent me to say it might or might not fit.