M and M Lambretta

Factory Changes

The information has been obtained from technical information sheets that were supplied to Lambretta dealers by the Centro Ricambi at Innocenti.

This information could be described as obscure and is possibly only of interest to those who want to have that little bit of extra information to ensure that their Lambretta is as correct as possible.

Jump to:
 Series 1 Changes

Series 2 Changes

Series 3 Changes

Note: dates listed below are in format of DD.MM.YY
Series 1 LI 125 & 150

For the eagle eyed, Series 1 Li 150 engine numbers start with a 7. Not sure if this was a mistake on behalf of the Italians or if over the years we have got our engine number information wrong. Anyway, I've split the info into two sections 1958 and 1959 to show the changes made during those years.

1958
 
18.7.58 - Li 150: Steering lock replaced, grub screw changed for screw for fixing steering lock
From engine number:  708821
 
29.7.58 - Li 125 & 150: Rear brake - in order to avoid dust infiltration a protective hose between rear brake cable ferrule and brake pedal used
From engine number: 502222 (125), 715631 (150)
 
1.8.58 - Li 125 & 150: Chain guide changed for an adjustable one
From engine number: 503046 (125), 716522 (150)
 
8.8.58 - Li 150: Electrical equipment updated - new battery from 6v4/A/H to 6v5A/H, new junction box also used
From engine number: 719165
 
10.9.58 - Li 125 & 150: New spring plate for front brake shoes
From engine number: 508581 (125), 710871 (150)
 
27.10.58 - Li 125 & 150: carb air intake fixing grill removed and plastic manifold introduced
From engine number 508590 (125), 727431 (150)
 
27.10.58 - Li 125 & 150: passenger hand grip changed from rear to front seat
From engine number  509266 (125), 728651 (150)
 
21.11.58 - Li 125: Electrical equipment updated - new junction box, new headlamp
From engine number 514081
 
13.12.58 - Li 125 & 150: new style choke cable fitted
From engine number: 518584 (125), 739491 (150)
 
15.12.58 - Li 125 & 150: new style exhaust fitted
From engine number:  518144 (125), 739571 (150)
 
1959
 
22.1.59 - Li 125 & 150: in order to avoid penetration of mud through the footbvoard opening a plate was fixed to the brake pedal to act as a mudguard .
From engine numbers 520810 (125) & 742261 (150)
 
05.02.59 - Li 125 & 150: New style front forks fitted with new cone for lower ball race and new internal mudguard fitted.
From engine numbers 523387 (125) & 746560 (150)
 
07.03.59 - Li 125: Headlamp switch changed with new switch where screws used not only fixed it to handlebar but also to cover.
From engine number 524542
 
07.03.59 - Li 125 & 150: Handlebar levers modified to eliminate vibration.
From engine numbers 528442 (125) & 753860 (150)
 
09.03.59 - Li 125 & 150: Grease nipple assembled on backplate of front brake cam and cam pin diameter lowered.
From engine numbers 527211(125) & 751436 (150)
 
09.03.59 - Li 125 & 150: New style petrol cap fitted with breather.
From engine numbers  528176 (125) & 751591 (150)

12.03.59 - Li 125 & 150: Toolbox changed & single gasket used instead of 4.
From engine numbers 529270 (125) & 754550 (150)

24.03.59 - Li 150: New speedo drive, cable and fixing ring fitted.
From engine number 751201

03.07.59 - Li 125 & 150: Gasket for air intake removed due to modification of filter plastic section and addition to pipe of 2 filter cover centering tongues.
From engine numbers 534176 (125) & 775198 (150)

04.07.59 - Li 125 & 150: Fitted with RIV shock absorber (one ring).
From engine number 533991 (125) & 778058 (150)

10.07.59 - Li 125 & 150: Spark plug changed from CW225c for Marelli CW 225c.
From engine numbers 533994 (125) & 781260 (150)

16.07.59 - Li 125 & 150: Front brake cable instead of passing inside fork steering tube now passes outside.
From engine numbers 537137 (125) & 790650 (150)



Series 2 LI 125, 150 & TV 175

Li 125 & 150
 
16.10.59: Li 125 & 150 - lower and upper handlebar, horncast, frame, headlamp, headlamp rim and rear light unit updated.
From engine numbers 547748 (Li 125) &  808963 (Li 150)
 
19.04.60: Li 125 & 150 - front fork changed.
From engine numbers 730679 (Li 125) &  849715 (Li 150)
 
10.11.60: Li 125 & 150 - legshields changed.
From engine numbers 761126 (Li 125) &  900682 (Li 150)
 
12.11.60: Li 125 - Kickstart changed.
From frame number 761126
 
28.02.61: Li 125 & 150 - rear light with brake light fitted.
From frame number 777544 (Li 125) &  921665 (Li 150)
 
06.03.61: Li 125 & 150 - airbox and airintake changed.
From frame number 780906 (Li 125) & 923214 (Li 150)
 
28.04.61: Li 125 & 150 - carb MA 18 BS5 (on the Li 125) changed to MA 19 BS 7. Carb MA 19 BS5 (on the Li 150) changed to MA 19 BS7. 
From engine number 784443 (Li 125) &  919525 (Li 150)

TV 175
 
11.06.59: Handlebar changed.
From engine number 103459
 
16.10.59: Tail light, frame and tool box door changed.
From engine number 109375
 
30.01.60: Carb MB 23 BS5 changed to MB 21 BS5. Also changed air intake, and air filter housing, 
From engine number 204492
 
01.09.60: Front forks changed. 
From engine number 209104
 
10.11.60: Legshields changed.
From engine number 221911
 
28.02.61: Rear light including brake light fitted. 
From engine number 224376
 
06.03.61: Air intake and airbox changed. 
From engine number 224886
 
28.04.61: Carb changed from MB 21 BS5 to MB 21 BS7.
From engine number 227928



Series 3 (All)

These data sheets we have sight of only go up to 1966 but we hope that you find the information invaluable.
Frame Change:

Modification sheet S/40 of 12.05.1965 deals with the change over of the old chrome ring frames to the new non-chrome ring frames. Also changed at the same time were the headset bottoms and legshields. This modifications is relevant to the Li 125, 150, TV 175 and Li 150 Special models.
 
4 Pole to 6 Pole:

26.9.1962: Innocenti made a change from 4 pole to 6 pole magneto's the machines where this change started are as follows:
 
LI 125  - from frame number 036626 onwards
LI 150  - from frame number 631475 onwards
TV 175 - from frame number 507945 onwards
 
Antivibration Plugs:

Machines had 4 anti-vibration plugs fitted to the flywheel cowling from the following frame numbers:
 
LI 125  - frame number 038839 onwards
LI 150  - frame number 633086 onwards
TV 175 - frame number 508889 onwards

TV 175 & TV 200 Side Panel Change:

09.12.1963: Innocenti change the Li style sidepanels on the TV 175 & TV 200 to the Li 150 Special style panels.

Golden & Silver badges:

Modification sheet T/73 of 05.05.1965 deals with the introduction of two new badges for the Li 150 Special. These badges being the silver and golden badges that were now used on the legshields.


The following information has been provided by Pete Davies of the British Lambretta Archive and produced with written permission.  The British Lambretta Archive is available here. 

Many thanks Pete !

More to come ...


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