Hi i have an issue with my wiring on my 1991 ktm 250 mx i am, getting no spark it has sem stator and coil/cdi the previous owner sold it this way he could not find a wiring diagram for sem coil and stator i am at a dead end i am pulling my hair out i now know why he sold it i have tested the stator with a ohms meter and all the sem parts are working i just dont know where the wires go from the stator it has 2 blue and one red and a black from the sem coil.cdi unit it has black white orange brown and red any help would be greatly appreciated. i also have a sem electic 2 box if any one requires it i will post.many thanks iain.
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A few things,start simple disconnect the kill switch,remove the spark plug cap from the wire,check all your coneections from the stator to the cdi box to the coil.Still no spark your going to need a multi meter to check the stator and coil.If all this checks out to be good then it is your cdi box.A word of caution test these parts before replacing as they are not returnable and could get costly.A good shop could diagnose your problem in hour time.It may be money well spent if you do not understand your bikes ignition system.
If your 125 pit bike skyteam is not sparking, even though you've tried everything, there could be a few different issues causing the problem. Some possible causes include:
Faulty ignition coil: The ignition coil is responsible for creating the spark that ignites the fuel in the engine. If the ignition coil is faulty, it will not produce a spark.
Stator issues: The stator is responsible for generating power to the ignition coil. If the stator is not working properly, it will not produce the power needed to create a spark.
CDI issues: The CDI (Capacitor Discharge Ignition) is responsible for sending power to the ignition coil. If the CDI is not working properly, it will not send power to the ignition coil, resulting in no spark.
Spark plug: A fouled or worn spark plug can prevent the engine from starting. Check the spark plug and replace it if necessary.
Wiring issues: A problem with the wiring can prevent the spark from reaching the spark plug. Check all the wiring connections and make sure they are clean and secure.
Battery: A weak or dead battery can prevent the engine from starting. Check the battery and charge or replace it if necessary.
It is possible that one or more of these issues may be causing the problem. It is recommend to check the owner's manual for troubleshooting and further guidance. If the problem persist, it is best to take it to a qualified mechanic for diagnosis and repair.
The Voltage From The Stator To The CDI Should Be Around 40 Volts(AC) At Cranking Speed. Be Sure Your Meter Is Set For (AC) Not (DC). The CDI Changes The (AC) Input Voltage To (DC) Output Voltage To The Primary Terminal At The Coil. An Electrical Shock Hazard Exist If Stator Voltage Is Checked With Engine Running. Always Perform This Test At Cranking Speed (R.P.M.) For SAFETY. 120 Volts (AC) Can Be Present With Engine Running.
If you are able to use a digital volt meter and work your backwards from spark plug wire to coil to cdi to stator you can figure out where voltage stops.thats a fairly newer bike unless you really submerged that bike under water i dont think its the cdi box.it could be coil wire it could be coil.you want to check or change the cheaper parts before you go right to cdi because there not cheap.I have a yamaha banshee 350 and she was breaking up real bad.I thought because it was only happining on top end that the cdi was breaking down or stator was going bad.Found out with meter it was the coil wires and spark plug boots.These items have to have a certain amount of resistance or the do not conduct correctly.And spark plug wires and boots are not that exspensive.So thats why I say start from sparkplug boot and work your way back.Try that and Good Luck.
I have a 83 DR 250 and i'm not getting enough voltage to create a spark, all I can suggest is that you check your battery and make sure its at full flavour. Check and see if you are getting any voltage prior to the ignition coil (should be 18-35v). If you suspect battery then try clutching it as the alternator moving faster might give you enough to get her going. Also check all your connections and earths. Earth wires are often overlooked and can cause you just as many problems as the actives. So give that a go and get back to me mate. Cheers
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