Question about 2005 Yamaha yZ 250 F

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2005 yz250 2 stroke has no spark! changed out spark plug, stater, coil, plug cap, cdi, checked wire harness for continuity? cleaned ground block and still no spark? what did i miss?

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Hi, Rob1 and the usual suspects are:
1. Fouled spark plugs.
2. Discharged battery, needs to be 12.5 volts or better and be able to pass a "LOAD" test, your battery may show 12.5 volts but has little or zero amps and must be replaced.
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 CDI 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.
2005 yz 250 eletrical issues NO SPARK
Yamaha YZ250 Project Part 1 No Spark
YAMAHA YZ250 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Posted on May 01, 2017

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Posted on Jan 02, 2017

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I have yamaha warrior 350 that has no spark. have changed cdi box, pick up coil, ignition coil, stater, spark plugs basically everything besides wiring harness. has 110lbs compression. i need help.


Hi Cheyenne, if you have a CKP sensor it needs compression to send correct signal to the ICM/ECM, make sure both spark plugs are in heads and use a grounded third plug to check for spark or hold spark plug cable close to spark plug in head. If still not getting spark the usual suspects are:
1. Fouled spark plugs.
2. Battery voltage below 8.7 volts, loose or broken battery cables, check the "NEGATIVE" cable at both ends.
3. Loose connection at ignition coil or plug between ignition sensor and module.
4. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose.
5. Faulty ignition coil or ignition / electronic module
6. Failed CKP, CMP, MAP or BAS sensor.
7. Faulty ignition switch.
8. Security alarm failing to disarm.
For more information about your issue, please visit the websites below. Good luck and have a nice day.
Yamaha Motorcycle Service Repair Workshop Manuals

Oct 10, 2015 | Yamaha Motorcycles

1 Answer

No spark on kawazaki kl250 a3 1980 model


Sounds like all there is left is the plug wire from the coil - but it's probably a single unit - coil and wire w/ plug boot.
All that comes to mind is grounding. With a VOM make sure you have a ground. Also look further up the chain - follow the wiring the CDI unit plugs into for breaks. Headlight gets brighter when kicked over ? Follow the wiring to it's termination points, loose plugs etc.

Single cylinder engines vibrate an awful lot, with that in mind look things over. There is a chance the no spark condition is a product of an unrelated failure - ignition system could be fine. Check the stator coil for an open circuit where it should be closed.

Besides checking wire and plug condition, cleaning and tightening grounds. The stator is the first place I'd check.
Be careful and gentle, the coil wires are very fine and as such break easy. A shorted winding will show continuity but not generate power, a web search should give resistance ranges of the coil assy.
Too low fail/Too high fail ranges.

My brain is picked out....Hope it helps you.

Sep 02, 2014 | Motorcycles

1 Answer

Suzuki street magic spark issue


First change spark plug. If not plug, check plug cap, unscrew it off lead and hold lead end to cyl head and crank. If it sparks, change cap. If not, check H.T coil, C.D.I. and stator coils.

Apr 24, 2014 | 2005 Suzuki Street Magic II

1 Answer

2000 honda crv engine


coil, stator, or wire to ground and to kill switch, it is grounding out somewhere - remove from coil to test.that.
Get inline spark tester at princess auto cheapie 6.00 can, or 10 for a good one. spark plug, timing, head gasket burn valve, hard to tell without compression test. if low put cap of oil in cylinder and if goes up is rings, if stays low (under 50lbs should be 90.) if stays low is a valve or head-gasket.
Check plug if dry when trying to start vehicle with choke on then remove spark plug and inspect it.
is carb or fuel problem if dry, is electrical if wet!
check fuses, and stuff and wires but probably a CDI unit to control the spark, or if old is a set of points and condensor and the spark must be triggered by a CDI, a lobe, or a coil CDI unit combo.
The coils on stator send 12 volt, coil to sparkplug send 20,000 volt and the gap in points or ruluctors should be set properly, typically stator to reluctor is set by a book of matches not folded but put piece carboard in between,spark plug gap say double that..
I suspect without more input fuel or spark. if the engine wont turn over the fuel to oil mixture wasnt enough, or the oil injector for fuel mixture if two stroke maybe clogged and may destroy your engine.
I don't suspect this but giving things to consider later.
Some bikes there is wires in a rubber plug as a chaijn indicator and the chain can break this connection, not sure about 4x4 though.
:)

Nov 01, 2013 | Computers & Internet

1 Answer

2005 grand am wont start


see this steps and fix it. God bless you
When the engine cranks normally but won't start, you need to check ignition, fuel and compression. Ignition is easy enough to check with a spark tester or by positioning a plug wire near a good ground. No spark? The most likely causes would be a failed ignition module, distributor pickup or cranshaft position sensor CKP

A tool such as an Ignition System Simulator can speed the diagnosis by quickly telling you if the ignition module and coil are capable of producing a spark with a simulated timing input signal. If the simulated signal generates a spark, the problem is a bad distributor pickup or crankshaft position sensor. No spark would point to a bad module or coil. Measuring ignition coil primary and secondary resistance can rule out that component as the culprit.
Module problems as well as pickup problems are often caused by loose, broken or corroded wiring terminals and connectors. Older GM HEI ignition modules are notorious for this. If you are working on a distributorless ignition system with a Hall effect crankshaft position sensor, check the sensor's reference voltage (VRef) and ground. The sensor must have 5 volts or it will remain permanently off and not generate a crank signal (which should set a fault code). Measure VRef between the sensor power supply wire and ground (use the engine block for a ground, not the sensor ground circuit wire). Don't see 5 volts? Then check the sensor wiring harness for loose or corroded connectors. A poor ground connection will have the same effect on the sensor operation as a bad VRef supply. Measure the voltage drop between the sensor ground wire and the engine block. More than a 0.1 voltage drop indicates a bad ground connection. Check the sensor mounting and wiring harness.
If a Hall effect crank sensor has power and ground, the next thing to check would be its output. With nothing in the sensor window, the sensor should be "on" and read 5 volts (VRef). Measure the sensor D.C. output voltage between the sensor signal output wire and ground (use the engine block again, not the ground wire). When the engine is cranked, the sensor output should drop to zero every time the shutter blade, notch, magnetic button or gear tooth passes through the sensor. No change in voltage would indicate a bad sensor that needs to be replaced.
If the primary side of the ignition system seems to be producing a trigger signal for the coil but the voltage is not reaching the plugs, a visual inspection of the coil tower, distributor cap, rotor and plug wires should be made to identify any defects that might be preventing the spark from reaching its intended destination.


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Oct 16, 2012 | 2005 Pontiac Grand Am

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

I have a 1996 xj600 Yamaha. I 've been experiencing a engine miss fire. I checked for spark by pulling each plug and grounding them out on the block. Number 4 doesn't spark at all, so I replaced the plugs...


could be a bad wire or plug cap they have a resister in them, each coil fires two plugs, so if the other one works off that coil the cdi is probably ok.
pull the caps off and check the resistance from the plug wire back to the coil ground, they need to be the same, the wires are moulded into the coils so if one has high or open resistance-new coil required

Apr 08, 2011 | 1994 Yamaha XJ 600 Diversion S

2 Answers

Sunl 150cc Won't start


sounds like the CDI module. I've had it go out on a couple scoots I've owned. Take it to a shop and have them check it

Oct 07, 2009 | Transport Schwinn Rechargeable Portable ...

1 Answer

2006 crf100 no spark


You have 2 basic possibilities,
  • A kill switch is active
  • The ignition control module has gone bad
The stock spark plug is an NGK CR7HSA. Is a kill switch on? Does the side stand have a kill switch? Is it working properly? Check the operation of all kill switches with a volt ohmmeter.

Check the wiring harness. Did a wire come unplugged? Are all wires clean and with solid connections? Any abraded or pinched wires? If still no spark, get CDI system checked at the dealers shop.

A top rating on this answer? Thanks!

May 24, 2009 | 2005 Honda CRF 100 F

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