Sunday, December 22, 2019

cota 123 ignition timing


I found this info here for setting the ignition on the Montesa Cota 123. 

Electricity : Ignition setting
The necessary equipment
1 flywheel extractor

1 set of shims
1 graduated disc (download)
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)
CAUTION: do not lose the key when removing the magnetic flywheel!
IGNITION ADVANCE
settings for COTA
MODEL
REFERENCE
ADVANCE
in millimeters
ADVANCE
in degrees
COTA 25
10M
2 to 2.25 mm
COTA 74
16M
2 mm
24 °
COTA 123
28M
3 mm
24 ° - 30 °
COTA 172
19M
3 mm
24 °
COTA 247
21M
2.5mm
21 °
COTA 348
51M
1.8mm
17.5 °
According to the manufacturer's data
Ignition MOTOPLAT
COTA 123 (ref. 9600.433)
and COTA 172 (ref. 9600.433)
1-Breakers
4-Stop winding
5-Lighting winding
connected with 13.
6-Ignition winding
8-Rotor
10-Pilot
and tail light winding
14-Ignition plate
15-Capacitor
17-Low voltage cable
19/20-Fixing the steering wheel
21-Clavette
27-High voltage coil
28-High voltage cable

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