Question about 2000 Yamaha DT 125 R

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Yamaha125dtr got no spark on bike changed spark plug checked coil and fuses ok was sparking fine then stoped

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  • Anonymous Mar 14, 2009

    all this has been checked and bypassed but still no spark suspect stator or cdi any ways of testing these components

  • rrrttt Mar 22, 2009





  • joe May 11, 2010

    engine kill switch is in the right position, right?

    bike is in neutral, not in gear, right?

    does this model have a kickstand safety switch? if it has one, is it still plugged in? tried to start it with the kickstand up?

    did it ever run? if it did, what was done to it before it got into this condition?


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Get a BRAND NEW plug and recheck for spark. Be sure plug is grounded to engine. By the way, FTjoe (above) has some very good questions. The sator is not involved here. The dealer can check the CDI usually for free.

Posted on Mar 14, 2009

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Won't run ?

The carb has nothing to do with the spark so forget that for the moment. I'm assuming you changed the coil because of no spark in the first place, in which case don't throw out the old one as it is probably fine and the fault lies elsewhere.
Another assumption.....Your headlights, brake lights, indicators, horn etc all work as they should with just the ignition turned on. Yes? Then no problem with the battery, but all the same check all your fuses are ok and the battery is charged. Press the starter and if the engine turns over then that side of things is fine (again, I guess you have already done that but failed to produce a spark).
Next thing to do is see if power is getting to the coil. When you changed the coil there will have been 2 wires coming from the wiring loom that you connected to spade terminals on the coil. A coloured one and a black one. Connect the coloured one to a test meter and see if there is any power there. If nothing, then I would try swapping your CDI unit (the bikes electronic brain) with another one from maybe a friends same bike if you can as they aren't cheap and it may not be faulty. If you are getting power to the coil then it is possible (although extremely unlikely) that the replacement is faulty.
The above may all be things that you have tried, but if not and you still have the problem after trying what you can, get back with more details including model and year I am sure others, myself included, may be able to help get it all running

Nov 10, 2015 | Motorcycles

1 Answer

Weak spark

If you have an ohm meter, check the resistance on coil 1 and 4 - across the positive and negative wires and compare that to the coil that feeds 2 and 3. If the resistance is higher on coil 1 and 4 that would cause a week spark and i would suggest changing it. If you don't have a meter, simply connect coil 2 and 3 to the wiring of coil 1 and 4 and turn the bike over and check the spark. if it is a stronger, then your 1 and 4 coil is the problem and will need replacing. Prior to checking all this, make sure that the earth contacts on your coil to bike frame are good and are clean and free of corrosion and the like. Hope this helps

Apr 14, 2014 | 2000 Yamaha YZF-R1

1 Answer

Zxr750l no spark at plugs but have power to coils. kill switch ok, coils ok. have checked side stand switch, fuses good. any help please.

You say you proved power to the coil but there is no spark at the end of the spark plug wire ... have you checked that spark plug wire? Could be very high resistance or open ...

Feb 24, 2013 | Motorcycles

1 Answer

No spark on my 2001 yamaha r1

Hi, Anonymous and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
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 CDI box.
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, pick up coil, trigger coil or CDI box testing needs to be checked with an ohmmeter at 70 degrees Fahrenheit
7. Faulty safety switches clutch, kickstand, neutral, off/on etc.
8. Faulty ignition switch.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
How to diagnose no spark situation on motorcycle
2000 2001 Yamaha YZF R1 Service Manual R1 Moto Data Project
OEM parts for Yamaha

May 06, 2012 | 2001 Yamaha YZF-R1

2 Answers

Honda crf450 no spark atall plenty of power out of stator changed cdi nd had coil checked all ok tried dissconecting kill switch to.

maybe get a new spark plug.make sure your grounded(earthed). did you take the plug out and check for spark against the motor while you cranked the bike over?

Oct 17, 2010 | 2002 Honda CRF 450 R

2 Answers

Hi i just got a 1988 gsx600f i put new plugs in it tuck it out for a ride and it was running good then i gave her a little gas to kinda see what it would do and it bogged so i idled it home and statred...

it seems odd that your coils would play up, usally the they just stop working. You talk of it bogging down? , i would suggest that to be a carby problem, especialy if the bike has sat around for a while. first try to just drain the carbys, as you can do this without removing them, should be a drain screw or plug on the bottom of the carby. Make sure your air filter is clean too!

May 27, 2010 | 1988 Suzuki GSX 600 F (Katana)

1 Answer

Ok, I put new gas in my bike, changed the oil, new battery, all new plugs,solenoid works, starter is fine,checked wiring to my starter that's fine, fuses are all fine what the heck else could this be? My...

If the bike has been sitting for awhile it may be clogged with old gas that evaporated an turned to varnish.

Check your choke cable and make sure it's properly adjusted.

You may have to clean the carbs. Or your coils are not sending spark to the plugs.

Apr 02, 2010 | 1981 Yamaha XJ 650

1 Answer

No spark at spark plugs so wont fire new battery all connections and grounds seem good was sitting for 3 months and ran at that time someone had turned on key and ran down the bat. so replaced but now have...

Check the coils first, leaving the key on may have burnt out part of your ignition system.
Easiest way to check coils is to pull one lead off, plug a spark plug into it. Run a hot wire from the positive side of the battery to the coil ( Do Not Plug it in!!) . If you flash the wire on and off the power side of the coil it should make a spark jump across the sparkplug ( don't forget to earth the base of the plug.)
If the coils are ok, see if you can borrow a CDI unit to try in your bike ( it is good to have mates with the same brand of bike )
Don't forget to check all fuses first and make sure the "Kill Switch" on the handlebars is on.
Happy fault finding.

Mar 29, 2010 | 1986 Yamaha FJ 1100

1 Answer

I have a 1998 TT 600R with 6,500 thousand kms. I can't seem to get any spark and as a result it won't start. There's power from the ignition but doesn't sem to be any spark. Apparently the bike was going...

Hi, Try checking all your fuses first , if they are fine test the spark plug and its lead, ,possibly change the plug as well if you do that then you will know if its a spark plug problem or a lead and coil issue ,
I had one of those and they are a fun bike to ride , there is not much electrics in them and there is only a few things that can cause it so try this first 

May 18, 2009 | Yamaha TT 600 R Motorcycles

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