bighomer46 Posted November 25, 2009 Share Posted November 25, 2009 Hello, Is there anyway of testing a cdi unit, rd125lc The frame No is 1GW001861 yamaha 34X-85841-01 (No off the circuit board) 34X-85842-00 ( No off the long black chip on the board) 1GU-MO71S (off the black box) I presume the No for the cdi is 1gu-85841-M0 It has two plugs and one wire One plug has 5 wires and one plug has 2 wires and a bullet connecter with one wire Please can someone tell me if this part has been superseeded by another or where i can source one as I think it is faulty. If a photo would help I will take a couple and post them Thanks in advance David Link to comment Share on other sites More sharing options...
Moderator Airhead Posted November 25, 2009 Moderator Share Posted November 25, 2009 Generally workshop manuals say that everything else should be checked first and give details about what to do and what resistance values you can expect to find on the various coils etc. Only after all this has been done do they say substitute the CDI for another...they never give a way of testing although there will be one. You can pay for this service at West Country Windings though this post may be useful too Link to comment Share on other sites More sharing options...
bighomer46 Posted November 26, 2009 Author Share Posted November 26, 2009 Thanks for the Links, I have no spark at all, and I have gone through the manual and tested the Ohm Value of the coil etc and all checks out ok. I have just put a new ignition on and am awaiting a new battery so one the battery arrives I will go through the system again. Can you tell me when the ignition is turned on should I hear the motor reset on the valves or ypvs ?? At the moment nothing is happening. Also do you know off the frame No what year this machine is. In France these bikes are not on a log book or anything and Bike do not have MOT's So it is get it running and go. Thanks David Link to comment Share on other sites More sharing options...
Speedshop Posted November 26, 2009 Share Posted November 26, 2009 Thanks for the Links, I have no spark at all, and I have gone through the manual and tested the Ohm Value of the coil etc and all checks out ok. I have just put a new ignition on and am awaiting a new battery so one the battery arrives I will go through the system again. Can you tell me when the ignition is turned on should I hear the motor reset on the valves or ypvs ?? At the moment nothing is happening. Also do you know off the frame No what year this machine is. In France these bikes are not on a log book or anything and Bike do not have MOT's So it is get it running and go. Thanks David I have a test rig that will run AC cdi boxes. I built it myself and it simulates the generator, altering the voltage and frequency as the engine would as it runs up and down the revs. there's a few other features I included to test other functions as well Link to comment Share on other sites More sharing options...
bighomer46 Posted November 26, 2009 Author Share Posted November 26, 2009 I have a test rig that will run AC cdi boxes. I built it myself and it simulates the generator, altering the voltage and frequency as the engine would as it runs up and down the revs. there's a few other features I included to test other functions as well I have sent you PM asking about shipping to you to test Thanks you very much A Great Offer David Link to comment Share on other sites More sharing options...
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