Question about 2000 Yamaha DT 125 R

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Cant get a spark on my dtr125

Do u know what colour wires go to the cdi unit and coil on a DT125R to get a spark from the plug. Thanks

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ITS A SINGLE ORANGE WIRE

Posted on Feb 27, 2011

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1 Answer

My Jonway YY50QT-6 49cc scooter voltage regulator burned up. I changed it but cant get any fire to the plug. I also changed the coil and cdi box but still dont get any spark the plug. Need help badly!


Good chance it has blown the cdi fuse ,alot of Chinese bikes have a separate fuse for the cdi unit,if it's ok I would say the generator is fried if you have had a burned out regulator.so check it for scorched wires.

Apr 15, 2015 | Jonway Motorcycles

1 Answer

Yamaha dtr125 misfire at high revs


Hi, Namesjames00 and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition and leaking.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil, module, and or sensor.
5. Battery nearly discharged.
6. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
7. Intake air leak.
8. Water, dirt, or rust in the fuel system, carburetor and/or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose, dirty, or corroded ignition module connector at crankcase.
13. Faulty MAP, CKP, O2, and/or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damaged intake or exhaust valve.
For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have nice a day.
Yamaha DT125R engine problems
dt125r keeps missing at high revs
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
OEM parts for Yamaha
http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf

Nov 21, 2012 | Yamaha DT 125 R Motorcycles

1 Answer

No spark from plug


Could be a wiring problem, Bad CDI unit, Bad Coil, Bad HT lead or a bad spark plug.. first thing to do is to take the spark plug cap off and hold the wire near the engine and see if a spark arcs onto the engine. if it does then its your spark plug or spark plug cap. If that doesnt work get a test lamp and check the voltage to the wire going into the coil, if it flashs the light then the coil is bad. If that doesnt work then it could be a wiring issue, so i would try unplugging the kill switch first. if that gives no joy then its a wire harness or CDI/ Magneto issue. So my next step would be to go to a salvage yard or mechanics with the bike and ask them to test the CDI (by using one they know is good or checking the wires).. they will tell you what the problem is from there. Tell them what you have done so far so they don't waste time.

Sep 09, 2012 | Motorcycles

1 Answer

How to test CDI unit for KTM65 2009 to diagnose if faulty or not.


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.

May 09, 2011 | 2009 KTM 65 SX

1 Answer

Low spark on one spark plug


Sounds like you need new wires.....but the cdi box could be working only on one cyl. also........I would try new wires first.....

Dec 29, 2009 | Polaris New Genuine Polaris Snowmobile...

1 Answer

No spark on 1998 Cagiva Canyon


did you check the primary coil? the ignition coil?if you think that these are all good,then you must replace the CDI.You cant test a CDI if this is good or not because it is a form of IC or integrated circuit,unless you have a manufacturer's diagram of it.You can check it by by detaching into its plug and get and replace an old CDI which you know is working,for example,get the CDI of the other motorcycle (if it has)the try to plug-in ,and if it fires,then thre you can surely know that the problem is on the CDI.

Nov 17, 2009 | 1998 Cagiva Canyon 500

1 Answer

No spark


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.

Jun 18, 2009 | Honda XR 200 Motorcycles

1 Answer

1983 Honda CX 500 B no spark


Hi, Roxsaund and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead acid batteries.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting/leaking, spark plug cable connections loose check for spark leakage in the dark.
6. Faulty ignition coil or electronic control module.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Intermittent Spark on CX650 AGAIN
How to diagnose no spark situation on motorcycle
Honda CX500 Shop Manual will have a wiring diagram
http://www.partsfish.com/page/oem-parts-for-honda
Honda CX500 CUSTOM Owner Manual

Jun 14, 2017 | 1983 Honda CX 500 B

3 Answers

1986 gsxr 400.not sparking r starting


Hi and welcome to FixYa,

If somehow, the CDI could be opened up, then component level repair maybe tried. There would be 2 final transistors that actually do the switching; 1 for each coil. Offhand, it would appear that 1 of those 2 is faulty. Otherwise, replacement is the only option.

Incidentally, in some versions, a fault in the tachometer could also cause one of the CDI's output to fail.

Postback results of tests.

Good luck and thank you for using FixYa.

May 27, 2009 | 1996 Honda CBR 400 RR

3 Answers

19-95 KLF300 ATV Kawasaki 4x4 no spark put new ignitor unit on.


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.

Dec 13, 2008 | kawasaki KLX 300 Motorcycles

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