Motorcycle Coils - Testing Primary and Secondry Resistance.
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- čas přidán 19. 03. 2019
- A quick test of the old coil to show the resistance readings across the primary and secondary wires. Nothing wrong with this coil but the HT Lead was shot so had to replace. You must make sure you know the resistance readings you are looking for so check your manual against not just make and model but also the year.
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I didn’t sign up for your autobiography I thought you show something like a test
Previous two videos
Thank you for the post.
You’re welcome
This is interesting and useful, bookmarked for future problem solving
Cheers dude, always good to get stuck in and have a look at how things are working.
Check the resistance without the plug cap, it could have 5k ohms resister in it, it might say on the side of the cap. It's for suppression.
you’re right it does.
my twin coil is showing 1 on the secondary (open circuit) and 5.3 on primary which is way to high. So i think it is totally fried, new coil on its way to me. Would you change the plugs as well?
Do you mean change the plug caps ? Either way I would change the plugs and caps all together, they are such cheap consumable parts. Did you test across the cap itself, or take it apart to check the resistor, that is a good confirmation of what’s wrong with the secondary reading, may be a fried resistor, but yeah replace it all, issue resolved 😁
cheers
All the bike coils are actually the same.
Primary if zero ohm thats fantastic
Secondary not higher than 7k ohm
And you can install a zero resistance spark plug also.
Zero resistance ??? They’re coils not superconductors 😂
what bike is that coil off ? I'm looking for a smaller coil to replace the standard 12 volt Lucas type . That looks about right as it has a primary of more than 3.5 ohms .
It off a 1992 Yamaha Virago XV535
How much volt do u need on the primary side? So it wil work propely?
I done know precisely but it will be in the low hundreds. Have you got a stator issue. I’d run a test on that.
Great vid! i'm getting a misfire and when i checked the primary the meter didn't read anything and the secondary read 2.5. do you think the lack of a reading from the primary could constitute a faulty coil?
make sure you have your multimeter ohms setting just higher than the reading you are looking for, as the primary should be 3.5-4.5 ohms and if you have set the meter to very high “in the thousands” setting the reading may be a false 0.00, set it to about 20ohms for the primary reading. Then turn it up for the secondary to about 20,000 ohms, and see what you get. If you do that and still get the same readings yes it’s a pretty good indication it’s fried as it seems you don’t have continuity across the primaries. If the reading are fine after you have done that then I’d replace the coil as routine as you may have a leaky HT lead and it’s all moulded of course. I’d also give the plug well a good clear, replace the plug, clean up the terminals on the LT cables and see if that makes any difference. As a quick measure, swap the coils and plugs over to see if the problem switches to the other cylinder 😁
@@memybikeni9931 Thanks for imparting your knowledge! yes i set the multimeter just how you explained but still no continuity at the primary circuit. It's just a single cylinder so i can't swap the coils over to test so i ordered a coil and plug. I also checked the stator and it's reading 490 ohms which it seems is within tolerance.
@@ProfileP246 yeah sounds like the coil is just dead then doesn’t it. The one thing I’ve learned is buy OEM coils, aftermarket seem to be quite short lived. I’ve gone through a couple on my virago.
@@memybikeni9931 if they are made in mexico not good they used too small dia wire will not last long
@@frankdavidson9675 that is the issue with aftermarket non OEM isn’t it. Never know what the quality is going to be like.
How do you test a coil with two spark plug leads? If you do the same test then you dont get a reading from the spark plug leads. There must be a different test for duel leads.
For the primaries it’s the same, for the secondary you test across the two HT Leads.
Hi mate, I have a ktm excf250 2008 and it's not sparking. I've tried following your video and still can't workout what's wrong. I was wondering if I can somehow get in contact with you and if you would help I'd really appreciate it.
Hi mate, it’s a difficult one to diagnose from a distance, very often takes a poke around. I’d suggest starting at the plug for spark, then cap with plug out, HT lead minus the cap, low tension wires into the coils, then back to the low tension output from the igniter. Connector into the igniter, connection from the battery. Have a good look round the wiring loom for any chafing, and grounding, check the side stand switch if fitted, clutch switch if fitted, and the dumbest thing, the kill switch. Check the voltage output from the pulsar coil and make sure that connected to the igniter properly. Check for resistance across the pulsar coil out put. Go back to the main coil and test for resistance over the primaries and the secondaries. Somewhere in there is going to be the issue. What will happen is you’ll go so far back and see there is a power break somewhere or a high resistance, I.e in the main coil, and that will isolate your issue.
Hi spoke to you before. Have just tested ignition coil on my DRZ. Secondary test seems ok showing correct resistance. Primary however reads 0.000 ohms resistance. Has this coil had it. Thanks Pete
So if you have just tested the secondary, then you may have the meter set high at around 20,000 ohms, as you’ll be looking for a reading in the 10-20k range. If you have not then dialled it down for the primary this may be your issue. As you are only looking for about 4-6 ohms you should set it to the lowest ohms reading setting, e,g 200 ohms. It should then register the lower reading that you are looking for. If it’s set at 20k still it’ll likely not register and show as zero. Nothing has zero unless it’s a superconductor. It’ll either show something or open circuit. If it is still truly showing zero after that then you have a broken multimeter I’d say, but my guess is this is the issue 😊
If it were a short in the coil, you’d likely still get around 0.6ohms from just the short and probes etc.
@@memybikeni9931 okay thanks for really quick reply. Have settings set correctly now thank you. Would you know if workshop manual recommended secondary resistance readings would be with spark plug cap on or off. Recommended reading should be between 12-20k ohms. Mines registering 6 ohms Thanks again Pete
6k ohms
@@petedevon if there is no resistor in the cap it shouldn’t make a difference. 6k seems low. Probably worth replacing the coil and leads etc anyway, but shouldn’t be the cause of a no spark if you are still having that issue.
Actual video regarding resistance begins at 2:25
@Edmund Pickle That's what happens when you don't wear your glasses, and type on a small cell phone screen, genius. lol
I have a 2002 drz400. Only Has one cable going into it. How do I test the primary coil. Also testing the secondary coil the reading shows 16.52. Is this too high. Thanks in advance
So to test the primary where there is only one lead you just place one of your multimeter probes on the input and the other to the grounding block, as that is the ground rather than a 2nd lead running back to ground. For the secondary that doesn’t sound too high to me, but I don’t have a spec on a DRZ400, but sounds about right. Why are you testing it, what’s your issue ?
@@memybikeni9931 Went to start the bike about 2 weeks after last being ridden. Wouldn't start or even remotely sound like firing. Tested for a spark and there isn't one. Not very mechanically minded but gradually working my way through things. Thanks for your last reply by the way. Will try this tomorrow. Bike is Kickstarter only. No battery either. Think my next step after checking the primary would be the stator maybe ?
@@petedevon yes just methodically work your way back, pulsar coil possibly or maybe a dodgy connection somewhere. Could be anything couldn’t it 😬. I actually quite like no spark situations, it’s there somewhere, just got to find nothing happening where it should be happening, and keep going back until you find it happening, and that’s where the issue lies 😂
@@memybikeni9931 Yes I'll keep plugging away at it. Thanks again
@@petedevon literally test and clean every single connection back, plug to the block, cap to the block, naked lead to the block, voltage from the primary lead to ground, stator resistance and voltage, pulsar coil same, issue will be in there somewhere mate. Other things to check if applicable, kill switch, side stand switch, clutch switch etc, although not familiar with the DRZ so just a generalisation.
Great video!
You couldn't change only the lead?
Thanks
you could with a bit of work but it’s a moulded unit.
@@memybikeni9931 thanks!
Checked the resistance on mine, read OK, literally tried everything other than the coils to stop the misfire...still misfiring so I'm replacing both coils...let's hope it works. If it doesn't, I'm our of ideas!
Try pulling the plug cap off the plug and just lightly holding it on the terminal. Have you test per that the plug is seating ok, and grounding well ?
Thank you for a great instruction video. I have a bike with 2 x CDI's powering 2 spark plugs each. I have a no spark situation at the plugs in caps. Using your method I have a Primary figure of 4.3 ohms on the LH CDI and fluctuating 4.3-5.1 ohms on the RH CDI. The manual says Primary should be 2.3-3.5 ohms. The Secondary on all 4 leads/caps is ZERO no reading at all, Manual says 12-13K ohms. I am thinking that both CDI's are toast but strange that both have tossed it in at the same time and also strange not even a reading for any secondary.
So the coils do sound bad, high resistance and variable resistance on the primaries, is clear cut, open circuit on the secondaries. Firstly though make sure you are testing the secondaries correctly. When you have one coil with two plug wires, test across the two plug wires, not primary to secondary, like you would with a single plug. If you still have nothing, take the plug caps off, probe directly into the wire. Trim the wire back, take the wire out, go straight into the coil terminal if you can. The virago ones are all moulded of course, but it sounds like yours are dead. It’s not unusual for both to go bad, one can over load the other if one fails. At least I think that’s why you were referring to when you said CDI, you meant coil ?
@@memybikeni9931 Thank you so much for your help, most appreciated. It's a 27yr old Ninja bike 1997 zx9r so I think I have got my money's worth out of the coils:-) The point of sale vendors refer to them as CDI's so I am picking up the term from that, but yes coils in the manual. I tested across the two plug wires and get a reading flash up and disappear quickly with wiggling the probes of 19K. I have ordered two new coils, hopefully will generate a spark for me.
@@johnbaxter85 sounds like that’s your fix. So the CDIs are specifically the ignition units that send the timed power to the coils, they are something different so maybe the seller was using the wrong term or just getting your wires crossed, excuse the pun.
3.30 sir this process my ignition coil is showing continuity is that okay or not ?
No resistance
So continuity means resistance, and depending on your bike should read a certain value. Across the primaries, the two pins on the coil, 3 - 5 ohms typically, so yes continuity, with low resistance reading, and across the secondary, either pin on the coil against the other end of the HT lead, 12-14,000 ohms needed, so again yes resistance should be seen, high ohms. Hope that makes sense.
@@memybikeni9931 sir tell me what to do secondary winding woth this process of video one lead in spark plug and one on signal point cdi it shows 4 ohms is that okay ? Can you give me your WhatsApp ? I will send you info
@@YAMAHA_FAN_BOi_95 make sure your meter is set correctly, as 4 ohms is way too low for a secondary reading as you describe. I don’t have WhatsApp sorry.
@@YAMAHA_FAN_BOi_95 take the plug cap off the end of the HT LEAD and try it once more, directly onto the HT lead, there may be an issue with the cap, some of them have resistors inside. If it still that low, replace it.
@@memybikeni9931 what you say sir is that okay
mine reads zero does that mean its bad
So I assume you mean the primaries ? So bear in mind nothing has zero resistance except super conductors and you’d expect you see something just through your probes, so if it shows ‘0’ then you may have the multimeter set on a very high Ohms reading of say 2000 or above and due to the sensitivity of your meter it’s just zeros out, so make sure it’s set no higher than 200 to get a reading in the 2-6 Ohms range. If you mean it’s showing ‘I’ as in an open circuit/infinite resistance then there is a break and it’s dead. If it is showing truly zero when you check the meter settings then there is likely a short in the windings and it should be replaced. If you mean the secondaries which I don’t think you do, and you have the meter set correctly at 20k ohms or above and it is showing 0 Ohms rather that ‘I’ infinite resistance, then as there is no physical connection between the windings it’s more likely you have a short. As the meter is set too high to read a low resistance value, again it will show zero resistance due to the meter calibration. Hope that makes sense.
i have zero reading on primary....so coil is buggered correct? replace it???
absolutely
@@memybikeni9931.. I have a reading.. Was on wrong setting on voltmeter. Its 4.60ohm. That will be functional?
@@danmobbs1976 oh yeah that is within range so all good there
@@memybikeni9931 still won't go... Got spark and carbs clean and receiving fuel. Got an Email? Can you help plz. I'm stuck for ideas
@@danmobbs1976 check the carbs are balanced ok, and mixture screws are set correctly. What’s the filter look like, is it blocked ? I assume you have compression, did it just stop running ?
How to check pulser coil
I did a video on this, here is the link czcams.com/video/CW903Y2xX6Y/video.html
As mentioned earlier, plug cap is a resistor!!!
Correct.
Wait,,,,what?
coils seem to get blame for all tbls there points and condensers to consider condenser cause all kinds of tbls first sigh of tbl is pitting points caused by faulty condenser or wrong mfd value. installed there is no one size fits all on condensers it must match the coil for max spark
This is a ‘92 with a pulser coil, and CDI so no points and condenser to worry about. But you are right, from this and your other comments, aftermarket parts not quite right for the bike can be a source of issues. I had no end of troubles with the ignition on this bike, but cheap parts mostly to blame.
get on with it!!!!
sir yes sir 💁♂️
Kool
Thank you
That ig, coil was in good condition of use .
Erm, yes ?
3:04
3:40 ''if we try now against...''
(if we try now 'GROUND' against secondary)
Hah ! So I used the verb ‘To Try’ interchangeably as it is with many verbs, understood from the context, and you feel the verb ‘Ground’ is more appropriate. Although ‘If we try now ground against’ is actually poor grammar on your part. Such a strange comment, but at least you tried or ‘GROUNDED’ 😂.
@@memybikeni9931 Wut in the - - - - are you
going on about, and my grammar is
bad (?), you sound like a 3rd grader, I wasn't
correcting any of your grammar, you don't even know what a
- - - verb is either.
I used your grammar not to insult you
dipwad, I used it (your grammar)
to keep the context paralleled, and simple.
MY POINT was to clarify for others that
you were 'trying' (taking) GROUND to the secondary,
(why do you think I highlighted 'ground' and
not your Grammar? lol
Someone that needs your tutorial will
most likely need to know the; 'what to what'.
Not having to guess what the CP is talking
about, is a good thing, some of the people
you're helping barely know what a multi
meter is. Cheers..
You talk so damm much get to the point
I really do.
Too much talk
It’s my religion 💁♂️
Voice is very low.cant understand.
Oh. Sounds ok on my iPad, is you vol up ?
@@memybikeni9931 sounds fine to me, turn up your volume.
OMG, just STF up and get to it. You waste first 4 minutes babbling.
Are you on your period ?
talks way too much
You’re right silent movies are definitely the way to go.