I found this info here for setting the ignition on the Montesa Cota 123.
|Electricity : Ignition setting|
|The ignition adjustment is static: it is done with the engine stopped, unlike other engines which allow dynamic adjustment using a strobe lamp.First set the distance between the switches: 0.30 to 0.35 mm. A 0.40 mm shim must not pass.|
To calibrate the ignition, I use a graduated disc (available for download ) which I fix in place of the rotor bolt and which is held in place by the extractor. I locate the TDC with the comparator (a simple rod may suffice), then I watch when the switches start to open. I can then read my angle on the graduated disc (I use the top of the gear selector as a guide). So as the rotor turns in CCW (count clockwise - editor's note: anticlockwise) and my disc is graduated in CW (clockwise - editor's note: clockwise), my ignition point must be at 335.7 degrees (24.3 degrees before TDC for COTA 123 ). In the direction of rotation of the rotor (CCW), the advance is reduced.
In the opposite direction (CW) the advance is increased. On the other hand, the stator adjustment margin is also 24.3 degrees. To effectively tighten the rotor nut, shift to the 6th gear and lock the rear brake. Meanwhile, tighten vigorously (8 to 10 m.kg)
connected with 13.
and tail light winding