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Check all wiring connections on cdi unit - just follow spark plugs leads back. If all cables are ok then you need to check the cdi unit out. Check that cut out switch is not on, although it should not tunr over, if this was the case
Is battery voltage up to at least 12.5 volts? Have you checked ALL of the ground points related to ignition? Is there spark at the spark plugs when engine quits? When running, does the charge show at least 13.5 volts on battery? Have you had the CDI unit checked at a Yamaha dealer?
If it is a CDI unit it could be that even tho it my test ok. If you have not all ready done so, take it to a bike shop and get them to test it under load. It should only cost a few dollars to have this done. And change Spark plug even though it my look ok it could be shot. And make sure that the CDI has a very good earth. I have found this problem with one of my bikes in the past and this fixed mine. Hope this helps Regards Micky
ok, your problem could be simple or could be quite involved. First thing to do would be to make sure its not a safety cut out i.e. kill switch on handle bar is set to off or is malfunctioning, side stand down while in gear, no neutral light. Also is the battery good?? A poor battery can cause the bike to have no spark as it can act as a resistor and not allow 12v to flow through the system thus preventing enough current for a spark. If its not that, hears where it can get tricky. It could be a number of other things i.e. If it has an immobilizer factory fitted or via an alarm system, Coil (which is usually not the case), Generator stator and pick ups or worse case a faulty CDI/ECU. You may want to get someone who knows about bikes to take a look. Good Luck
Hi With Ignition switch off :- 1st Check for bad connections, broken/crushed wires, continuity & resistance between the cap, HT lead, coil, ignition coil primary wires 2nd Disconnect the CDI unit from its connector & check for the same between the loom side of the connector back to the coil 3rd Check coil is earthed
If all OK suspect the CDI unit but double check everything first( there are some more checks as well), as these are very expensive
Ride safe
Bike-Doc
Please rate this solution well if it has helped !! Any comments welcome
My thoughts...Light globes are made to withstand voltages of less than 16 volts. So if you are finding your headlight globe burnt out, it's because the system voltage has exceeded this. Have your voltage regulator replaced which will remedy the problem. Over voltage will have an effect on other electronic components such as the CDI unit and wreck your battery too.
It seems the charging system of your bike is not working
Recharge the battery and thn fit it in the bike and start it and check the charging rate.
Remember with lights 'on' it drains power from the battery butthe charging system of theengine takes over i.e. if its working alright, with your explanation, its for sure the charging system is not functioning.
Chekc the altenator and the rectifier.
did the bike stop when riding?
if you have no spark to both cylinders it will be the CDI box , pick up coils or wiring
If you can give me more details on how/when this problem happened i can help more
if you get a small voltage(1-2v)from you pick-up coil then this should be ok,CDI requires to test your supply to it ie:12v etc and your voltage from pick-up and obviously supply out.If you have these voltages coming in and nothing out then your unit is U/S but one thing to make sure of is that you kill switch wire is not earthed out at the unit.
Check the side stand kill switch if your bike has one. It kills the engine so that you don’t start out with the side stand down. If broken or out of adjustment, it would kill the spark. Check for a broken wire at the side stand switch and coupler. Try moving the kill switch by hand. If that doesn’t work then wire a jumper around the switch to bypass it. Check the fuses. How good is the battery? Try a jump start from your car battery. Is the handlebar kill switch on? Check the operation of the ignition switch and all kill switches with a volt ohmmeter. Install new spark plug.
If that doesn't do it, check the wiring harness. Did a wire come unplugged? Are all wires clean and with solid connections? Any abraded or pinched wires? Is the bike in neutral and the neutral light is lit up? If no neutral light, check the neutral switch and neutral switch wire on center casing. If still no spark, get CDI system and coils checked at the dealers shop. You can screw up a CDI unit checking it yourself.
You said the motor cut out and popped and backfired when it quit, this is almost always one of two things; either the low speed pulse coil or the actual CDI "black" box. You will almost never lose a main coil. One thing I would also check to make sure did not happen is shearing a flywheel mag key. When the motor backfires you can easily shear a mag key if you have a heavy flywheel, (external). However when this happens you don't usually lose spark but it will certainly cause the backfire. One other item of importance is that the bike you are in question about does not emit a bright spark when you are checking for fire. Make sure you are using a brand new plug and ground it on the head. Try to make sure you are in a dark environment when you check the spark.
Battery location
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