Lambretta And Vespa
   Ignition Timing Information





 

Vespa Standard Ignition Timing


16 Degrees         = T5 125
17 Degrees         = V100 Std., 100 Sport
18 Degrees         = PK125 ETS, PX Electric Start Modern setting for Unleaded.

19 Degrees         = V50S, V90, PK50/80/100/125, PK50XL/100XL
21 Degrees         = P125/150X Points Models and some Electronic PX - IT setting
22 Degrees         = Super, Sprint etc., VSD1
23 Degrees         = P200E All Models ( A setting )
24 Degrees         = V90SS Racer, Primavera, Rally Femsatronic

25/6 Degrees      = VMA1, 232L2,
28 Degrees         = Sportique, 312 L2

Don’t Forget that all timings are + or – 1 Degree  -

Please Note: Older recommended Ignition timing setting where for 2 star fuel. Modern unleaded fuels tend to move the timing a little closer to TDC. 

Vespa Tuned Ignition Timing
DR 110cc and 135        = 19 to 20 Degrees ( or standard modern setting for unleaded fuels ).
DR 180cc                     = 20 to 21 Degrees - Standard IT setting, 18 degrees is the standard IT on newer models for unleaded.
Malossi 110 and 135cc  = 16 to 18 Degrees
Malossi 166cc               = 18 Degrees
Malossi 172 T5             = 13 to 14 Degrees instead of 16 Degrees
Malossi 210cc               = 18 Degrees instead of 23 Degrees as used on std. P200E’s
Pinasco 177cc               = 20 to 21 Degrees ( IT standard setting ), Cast Iron, Alloy, Two Port and Three Port.
Pinasco T5 162cc Kit      = 20 Degrees instead of 16 Degrees
Pinasco Kits 50-100cc    = 18 Degrees in stead of 19 Degrees
Polini 207cc                  = is measured in mm and is 2.3mm
Polini 177cc                  = is also measured in mm and is 2.0mm
Polini 125/135cc            = is 2.0mm

Lambretta Ignition Timing
125 to 200cc Li SX        = 23 Degrees ( or standard modern setting for unleaded fuels 19 to 20 degrees ).
125 to 200cc GP           = 21 Degrees ( or standard modern setting for unleaded fuels 19 to 20 degrees ).


Lambretta Tuned Ignition Timing
175 to 225cc Li SX        = 17 to 19 Degrees.




Beedspeed Info on Crankshaft Stroke and Con-Rod Data

 

Con-Rod

Stroke

VESPA

 

 

50 Special, PK 50

87mm

43mm

V90/100, Prim, PK80/100/125, ET3

97mm

51mm

150 Super, PX125/150 All Models

105mm

57mm

T5

105mm

52mm

Rally 200, P200E All Models

110mm

57mm

PX125/150 Long Stroke

105mm

60mm

Rally 200 (Ducati) P200E Long Stroke

110mm

60mm

LAMBRETTA

 

 

75 Vega

85mm

44mm

J100/J125

95mm

48mm

Li Series

107mm

58mm

TV175

116mm

58mm

240/250 Conversion

116mm

60mm

YAMAHA

 

 

RD 350

110mm

 





Lambretta Ignition Timing
Piston Travel (mm) vs. Crankshaft Rotation <BTDC>
(Before Top Dead Centre)

 

107mm Rod
Standard

110mm Rod

116mm Rod

58mm Stroke Crank  Standard

15 Degrees

1.25mm

1.25mm

1.23mm

16 Degrees

1.42mm

1.41mm

1.40mm

17 Degrees

1.60mm

1.59mm

1.58mm

18 Degrees

1.79mm

1.79mm

1.77mm

19 Degrees

2.00mm

1.99mm

1.97mm

20 Degrees

2.21mm

2.20mm

2.17mm

21 Degrees

2.43mm

2.42mm

2.39mm

22 Degrees

2.66mm

2.65mm

2.62mm

22 Degrees

2.90mm

2.89mm

2.86mm

60mm Stroke Crank

15 Degrees

1.30mm

1.30mm

1.28mm

16 Degrees

1.48mm

1.47mm

1.48mm

17 Degrees

1.67mm

1.66mm

1.64mm

18 Degrees

1.87mm

1.86mm

1.84mm

19 Degrees

2.08mm

2.07mm

2.05mm

20 Degrees

2.30mm

2.30mm

2.26mm

21 Degrees

2.53mm

2.52mm

2.49mm

22 Degrees

2.78mm

2.76mm

2.73mm

22 Degrees

3.03mm

3.01mm

2.98mm

61mm Stroke Crank

15 Degrees

1.33mm

1.32mm

1.31mm

16 Degrees

1.51mm

1.50mm

1.49mm

17 Degrees

1.70mm

1.70mm

1.68mm

18 Degrees

1.91mm

1.90mm

1.88mm

19 Degrees

2.12mm

2.11mm

2.09mm

20 Degrees

2.35mm

2.34mm

2.31mm

21 Degrees

2.59mm

2.57mm

2.54mm

22 Degrees

2.83mm

2.81mm

2.79mm

22 Degrees

3.09mm

3.07mm

3.04mm

62mm Stroke Crank

15 Degrees

1.36mm

1.35mm

1.33mm

16 Degrees

1.54mm

1.53mm

1.52mm

17 Degrees

1.74mm

1.73mm

1.71mm

18 Degrees

1.95mm

1.94mm

1.91mm

19 Degrees

2.17mm

2.15mm

2.13mm

20 Degrees

2.40mm

2.38mm

2.36mm

21 Degrees

2.64mm

2.62mm

2.59mm

22 Degrees

2.89mm

2.87mm

2.84mm

22 Degrees

3.15mm

3.13mm

3.10mm



Vespa Ignition Timing
Piston Travel (mm) vs. Crankshaft Rotation
<BTDC> (Before Top Dead Centre)

87mm Rod  Standard

V50, Special, PK 50 (Standard Stroke 43mm ST)

17 Degrees

1.453mm

18 Degrees

1.306mm

19 Degrees

1.167mm

97mm Rod Standard
Primavera, ET3, V90, V100, PK100, PK125 (Standard 51mm Stroke)

17 Degrees

1.401mm

18 Degrees

1.569mm

19 Degrees

1.745mm

20 Degrees

1.931mm

21 Degrees

2.125mm

22 Degrees

2.328mm

23 Degrees

2.54mm

24 Degrees

2.761mm

105mm Rod Standard
T5 (Standard 52mm Stroke
)

 

13 Degrees

0.829mm

14 Degrees

0.961mm

15 Degrees

1.102mm

16 Degrees

1.252mm

105mm Rod Standard

150 Super, Sprint, PX125EFL, P150X, PX150EFL (Standard 57mm Stroke)

17 Degrees

1.576mm

18 Degrees

1.765mm

19 Degrees

1.963mm

20 Degrees

2.172mm

21 Degrees

2.391mm

110mm Rod Standard

Rally 200, P200E, PX200EFL (Standard 57mm Stroke) 

17 Degrees

1.561mm

18 Degrees

1.784mm

19 Degrees

1.945mm

20 Degrees

2.151mm

21 Degrees

2.368mm

22 Degrees

2.595mm

23 Degrees

2.831mm

110mm Rod Standard

Rally 200, P200E, PX200EFL (Long 60mm Stroke)  

17 Degrees

1.661mm

18 Degrees

1.86mm

19 Degrees

2.069mm

20 Degrees

2.289mm

21 Degrees

2.519mm

22 Degrees

2.76mm

23 Degrees

3.011mm


 












































































 




























































































































































TIP for setting the ignition timing using a Beedspeed timing disc:

Lambretta and Vespa Example:
With the piston at TDC ( Top dead Centre ), make a white mark across the 
flywheel and the  engine casing. Place the TOP mark on the timing disc  also
in line  with the TDC  white marks. Then move the Flywheel and  Disc
anticlockwise  the  required amount of  degrees BTDC and make another  white
mark  on the  engine casing  opposite the  white mark on the flywheel  –  this
is  the timing mark for the required amount of degrees Before Top Dead Centre (BTDC).
Either the points should  open at this point or  the electronic should trigger should operate.