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SPEEDOMETERS UP TO 1964
Regarding Smiths speedometers a major change was made in 1964
Pre 1964 machines fitted the following;
The larger 3” instrument was of the Chronometric type. This in reality is a two in one clock a speed recorder and a distance recorder.
The speed is calculated by the same principle as used in clocks and watches which gives very accurate readings. The distance is calculated by a series of gears and ratios which move the numbers round.
Type identification numbers on the dial start: S xxx/x/x OR SCxxxx/xx for speedo RC xxxx/xx for Tacho
The 2” speedo was of the magnetic type still used today.
A magnet which is close to a metal disc is rotated by the drive cable and ‘drags’ the disc round with it. A pointer is fixed to the disc which shows the speed on a dial.
A hair spring retains the disc from revolving freely. Speed is recorded by the drag of the magnet against the restraining force of the spring.
Mileage is again recorded by gears.
Type identification numbers on the dial: X 80421 OR SN31xx/xx for Speedo RNxxxx/xx for Tacho
SPEEDOMETERS USED FROM 1964
In 1963 the British motorcycle industry approached Smiths Industries to manufacture a cheaper 3” speedometer as the chronometric was too expensive for mass produced machines. Note British government (Police etc) still used Chronometric instruments after this time as they were very accurate and reliable.
The 3” speedometer manufactured after 1963/4 used the same principle described earlier.
Type identification numbers on the dial start: SSM 3xxx/xx SSM 4xxx/xx SSM 5xxx/xx for speedometer RSM 3xxx/xx RSM 4xxx/xx for Tachometer.
The design of the smaller 2” speedo was changed but the principle remained the same:
Type identification numbers on the dial start SSM 2xxx/xx Speedometer RSM 2xxx/xx for Tachometer.
WE OFFER THE FOLLOWING SERVICES:
Service & Repair (inc 12 months warranty)
S/SC 80mm - 120.00
SSM 80mm - 100.00
SSM 60mm - 100.00
Please note: If any internal parts are beyond repair it will be reported to you with possible additional costs. If you decide not to go ahead with the works your instrument can be returned to you with just the P&P cost.
Full Restoration (inc 12 months warranty)
S/SC 80mm - 175.00
SSM 80mm - 145.00
SSM 60mm - 145.00
Please note: Your instrument will be cosmetically restored as well as parts replaced and cleaned. Please state when sending in if you would like the odometer reading staying the same or resetting to zero.
If any internal parts are beyond repair it will be reported to you with possible additional costs. If you decide not to go ahead with the works your instrument can be returned to you with just the P&P cost.
Glass & Bezel replacement
35.00
When sending instruments to us, please retain all fixing straps, brackets, bulb-holders etc, and please ensure they are well packaged, (We regularly receive instruments that have been damaged beyond repair due to inadequate packaging). Also make sure your Full name and address is shown on the outside of the package, and also included inside with your instructions.
We recommend that each instrument is wrapped in something like 'Bubble-wrap' and packaged in a stout cardboard box. Please ensure your parcel is sent recorded delivery.
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