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Montesa cota 311 1992 wiring diagram. Plus mods to fan system.


Bikewimp
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Hi, some additional info.

No 9 is not a Rectifier, It is a 12v regulator which bleeds any voltage from the stator winding that is over 12v to earth. therefore the lights etc are fed 12v AC current.

No 11 is a Rectifier which rectifies the 12v AC to 12v DC to feed the fan. Note the Thermostat in the cylinder head when switched will provide the earth to both this rectifier and the fan.

Kill switch is fitted to the white from the CDI in the same connector as the green to the coil.

I modded the fan system as below using modern electronics as all were cream crackered. 

Used a 12v regulator from Electrex world (replacing No 9 on above diagram)  https://www.electrexworld.co.uk/acatalog/RG12.html#SID=990

Used a Leonelli fan rectifier from Splat Shop for the fan 12v feed. https://www.splatshop.co.uk/gasgas-fan-rectifier-regulator.html

Used a 2 pole thermostat to mimic modern wiring diagrams for Gas Gas fan. Switches on at 65 degrees so fan comes on sooner. Original was a 16mm thread and switched at 77 degrees. https://www.ebay.co.uk/itm/2x-M16-Radiator-Thermal-Fan-Switch-Thermostat-For-250cc-Water-Cooled-ATV-Scooter/111851998808?ssPageName=STRK%3AMEBIDX%3AITand_trksid=p2060353.m1438.l2649

Wired as below. I hope this info is of help to someone in future, as it took a bit of figuring out. Sorry for the scruffy bit of drawing. 

Cheers, Andy

Montesa_cota_311_1992_fan_wiring._new.jpg

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