Question about 2003 Honda XR 650 L

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No spark on spark plug how to check ignator coil and pulse generator

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To check the ignition coil, unplug the wires going to it and check the resistance with an ohm meter. There are two parts of it to check, the primary and secondary circuits. The primary circuit is the low voltage side where the black and green wires from the harness attach. The resistance through this part of the coil should be between 0.16 and 0.19 ohms. Check the secondary side by measuring the resistance between the spark plug lead and the primary side where the green wire was attached. The resistance there should be between 3.69 and 4.51 ohms.
The resistance through the pulse generator, as measured between the two wires that come from it, should be between 468 and 572 ohms.
Generally, the various components of the ignition system are very trouble free. If you're not getting spark to the spark plug, be sure to check all of the bike's wire harness and connectors for corrosion, melted connectors, broken wires, etc.

Posted on Nov 22, 2009

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Why my 94 Astro van will not fire


this generation of gm vehicles is easy to troubleshoot. the engine needs 3 things to run: compression, fuel, and spark. since you mention fire, i assume you have no spark.

disconnect any random spark plug wire and connect the end to a hei spark tester. crank engine and observe for spark. if you have no spark, disconnect the center terminal of the distributor cap and use the hei tester in the same manner. spark means cap and rotor bad or bad plug wireset. no spark means make more checks.

check for battery voltage and good ground on distributor. check for open or shorted ignition module or ignition coil windings. if power and ground is present and ignition coil tests ok, check for ignition pulses at coil primary. if you have no ignition pulses feeding the coil, change the distributor.

with that generation of vehicle, the ignition system will operate without help from the computer. don't even troubleshoot the guts of the distributor, if you change the cap, rotor, and anything else, it will be the same price as a remanufactured distributor, and might not fix the problem. if you troubleshoot a low volrage related issue (no pulses, shorted or open circuit, unstable timing, etc), change the whole thing.

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To fire up the bike will need gas and a good spark on time.
Do you have a wet spark plugs on rear, if not, you have a carb problem (clogged jets, no fuel in carb chamber, torn diaphragm),
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Check for faulty spark plug, fouled spark plug, loose or disconnected wires, broken or shorted spark plug wires, faulty ignition pulse generator, faulty ignition coil, faulty engine stop switch, faulty ignition control module or some others.

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Oct 16, 2014 | Motorcycles

1 Answer

2004 Tiburon...drove earlier today then parked. Tried to start it again but it would not start. I checked all of the fuses related to the ignition system and checked for spark on each of the coils.None of...


If there is none of spark at each spark plug when you crank the engine. Assuming that you checked the spark like that, unless you have other way in doing this, then the problem is the ignition module.
The spark at the secondary coil is only generates a spark at a spark plug if there is a pulse voltage at a primary coil. The pulse voltage is not there then there is no spark. The one generates the pulse voltage is the ignition module when the starting is in action. Hop this can help.

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1994 honda cbr 600 motorcycle wont start just turns over put new petrol and replaced plugs but still wont start please help


check pulse generator circuit for any opens or shorts..even if you still show a weak purplish/red spark its bad..it must be a big bluish/white spark..check plug #1 for spark and then check #3 foe spark if there both week then its your pulse generators that are bad ..but if one of them has a blushish spark then it that systems coil..eg #1and#4 or the #2and #3 coils..

Aug 19, 2010 | 1994 Honda CBR 600 F(2)R

1 Answer

I have a 1995 gsxr 750 and its just not getting any spark is there any way to check the coil.


if there's no spark on all your plugs.. #1and #4 run off one coil, and #2 and #3 off the other, so if All the plugs aren't getting power then its not the coils, it might be the pulse generators or other wise know as the distributor. The distributor distributes the energy pulse to the coils so it can fire the plug at the correct time!

Aug 17, 2010 | Suzuki GSX-R 750 G Motorcycles

1 Answer

No spark


check pulse generators first, i found one burnt and one was open on my 87 hurricane 600. Ohm the wires out for opens or low ohm readings readings,they should be about 400ohms or more. if thats good then check out spark unit..if thats good then check to see if coils wires are getting 12v. Then if that is good check resistance of primary and secondary plug wires. or just replace them anyway and that one less thing to worry about. you have new plugs and wires. it can only really be the coils or pulse generator. hope this get you in the ballpark can iget a helpful on this thanks but if i helped you fix it by checking the pulse generators i'd like a very helpful, appreciate!

Apr 10, 2010 | 1987 Honda CBR 1000 F

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I have no spark.. have replaced crank sensor, computer, coil pack.... cranks over fine just no fire.... also injectors are pulsing with key in on posistion


The coil is good after you check resistance from primary and secondary terminals, but it won't generate spark if there is not pulsing at the primary terminals. You can generate sparks by connecting at the primary coil to 12 volts from the battery. Connect the secondary terminal to a spark plug. Now the primary connection has to make pulses on off continuously (either positive or negative ) to generate the spark from the secondary terminal (now is at the spark plug). If you have spark here then the problem is the ignition module. It is a electronic device to perform the function as you just did to generate the spark. Good luck.

Nov 10, 2009 | 1992 Oldsmobile Silhouette

1 Answer

Still no spark to plugs even after replacing coils.


Either your pulse generator does not give right pulses to the ECU or your ECU need replacement.Find the wires that travel from the pulse gen to the ECU to check them for pulse.

Jun 18, 2009 | 1980 Honda GL 1100 Innerstate Gold Wing

1 Answer

I can not get a spark on my dominator ,checked the kill switch pulse generator ,new coil new plug ,


Did you replace the plug wires? are the spark plugs fouled or gapped improperly? Check to see if you have power going into the coil, if you do then there should be spark coming out of the coil, and if there is and your wires and plugs are proper and servicable then you should have ignition.

Jun 07, 2009 | 1997 Yamaha XJR 400

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