SF3 Blowing Plugs after electronic ignition installed

Mumbles said:
doing ohms test with a multi meter on the electrode of the plug shows it is broken, not conducting any longer.
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This is probably a dumb question, but did you have your meter on the correct Ohms scale?
You're using resistor plugs so will need a scale >5 KOhms. Any lower scale will read as no conductivity.

If the plug is really open circuit, then as Tippie said, it could be blowing the resistor. But I'm gobsmacked that an ignition system could do that to any spark plug of reasonable quality like NGK. Makes me think you might have a batch of fake NGK plugs. Apparently counterfeit NGK plugs are quite common, and are rubbish. There's plenty of info on internet about identifying them.

I'm surprised an Electronic Sachse ignition would fire the plugs when switched on. I thought they were better designed than that.

I'd be interested to have a look at a "blown" plug. I'd like to take it apart and see how it's failed. Simple enough to take one apart. You just have to remove the crimped edge (ideally in a lathe, but do-able with a grinder) that holds the porcelain insulator in.

I'm showing my age here, but I remember the good old days of Lodge spark plugs that you could take the innards out of, clean with various wire brushes and then reassemble. The porcelain insulator was retained by a threaded collar rather than a crimped edge.
 
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This does not make sense. There is no way an ignition can cause a spark plug to go open circuit unless you have ignitions coils the size of your house producing huge amounts of current. The amount of current flowing through the plug is very small. Are you sure you have real NGK spark plugs not China fake reproductions?

Have you tried testing with non resistor plugs and using resistor wires?
 
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1200ts said:
Have you tried testing with non resistor plugs and using resistor wires?
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Or resistor plug caps.
Get any plug (from your lawn mower or whatever) and stick them onto the plug caps, resting on the engine (not installed), and spin the motor over. Let us know if the spark plug on one side just sparks once and dies.
 
1200ts said:
This does not make sense. There is no way an ignition can cause a spark plug to go open circuit unless you have ignitions coils the size of your house producing huge amounts of current. The amount of current flowing through the plug is very small. Are you sure you have real NGK spark plugs not China fake reproductions?

Have you tried testing with non resistor plugs and using resistor wires?
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Thanks I believe with the amount of plugs I would have at some point, but I will go and specifically buy these now, leads and caps to suit - let you know --- Cheers
 
Dellortoman said:
This is probably a dumb question, but did you have your meter on the correct Ohms scale?
You're using resistor plugs so will need a scale >5 KOhms. Any lower scale will read as no conductivity.

If the plug is really open circuit, then as Tippie said, it could be blowing the resistor. But I'm gobsmacked that an ignition system could do that to any spark plug of reasonable quality like NGK. Makes me think you might have a batch of fake NGK plugs. Apparently counterfeit NGK plugs are quite common, and are rubbish. There's plenty of info on internet about identifying them.

I'm surprised an Electronic Sachse ignition would fire the plugs when switched on. I thought they were better designed than that.

I'd be interested to have a look at a "blown" plug. I'd like to take it apart and see how it's failed. Simple enough to take one apart. You just have to remove the crimped edge (ideally in a lathe, but do-able with a grinder) that holds the porcelain insulator in.

I'm showing my age here, but I remember the good old days of Lodge spark plugs that you could take the innards out of, clean with various wire brushes and then reassemble. The porcelain insulator was retained by a threaded collar rather than a crimped edge.
Click to expand...
If I can find an ex-plug I will attempt this and take photos and let you know - buying plugs from reputable stores keeping in mind I have tried multiple brands. -- Cheers
 
Maybe it is just a coincidence: when I changed to the DMC, I also had some plugs fooling. What I found out is that the starting procedure matters, at least on my bike: Many people open Choke fully to start the bike. This floods a lot of gas into the cylinders which can lead to plugs fooling (carbonizing the contacts).

After changing to first pressing the starter and then slowly opening the choke until the engine barks into life, I have never fooled a plug ever again. Maybe that helps?
 
Laverdalothar said:
Maybe it is just a coincidence: when I changed to the DMC, I also had some plugs fooling. What I found out is that the starting procedure matters, at least on my bike: Many people open Choke fully to start the bike. This floods a lot of gas into the cylinders which can lead to plugs fooling (carbonizing the contacts).

After changing to first pressing the starter and then slowly opening the choke until the engine barks into life, I have never fooled a plug ever again. Maybe that helps?
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Thanks can't hurt to try although fouling not the issue here - I will work on the resistor blowing and go from there. Ta M
 
Hey Lothar, Your English is usually excellent, but the word you're looking for is fouling, not fooling.

Fooling is a valid word, so spell-check wouldn't have picked it up.

I'm not just being a pedantic git. My intention in pointing it out is to help you refine your English language skills. If you'd only done it once I'd have assumed it was a typographical error and ignored it, but you did it several times so you appear to have vocabulary mix-up in your head.

My foreign language skills are pretty crap compared to yours. I speak a little French (not fluent), even less Italian and pretty much zero German. I can make sense of written French because I can read it at my own pace, but any native French speaker will talk too fast for me to keep up.
 
Thanks for keeping me correct here, I try to remember that. I wasn't aware of the difference really so: yes, it is using actually the wrong word because of lack of better knowledge ;-) Nevertheless, I am also diagnosed with Dislexia, something you are not getting rid of but can improve with lots of training (and the help of the spell-checker, really my favorite tool on every application!). So - sorry if sometimes I miss-type even some words (like triple and Tripple, just to name one of many examples), I have a hard time remembering these words even in German... :cautious: So - I am used to get corrected and I am really thankful you do. I appreciate that you take the time to help me to get better, please! ;) (and just to avoid potential misunderstanding: I honestly mean that!)

cheers


Lothar
(P.S.: Spell checker only showed 4 faults this time 🥳🎉👯‍♂️, hope he caught all of them and I corrected them right...)
 
My free spell checker, Grammarly, I rate at 75%, just using Google and its inbuilt spell checker is in my experience 90% accurate. And it's free as well. The one in Chrome is complete crap. Dyslexia is my issue as well. I just blank out on simple words a lot, it's painful to live with especially when you deal with insensitive CUNTS. That I can spell.
 
Dellortoman said:
Hey Lothar, Your English is usually excellent, but the word you're looking for is fouling, not fooling.

Fooling is a valid word, so spell-check wouldn't have picked it up.

I'm not just being a pedantic git. My intention in pointing it out is to help you refine your English language skills. If you'd only done it once I'd have assumed it was a typographical error and ignored it, but you did it several times so you appear to have vocabulary mix-up in your head.

My foreign language skills are pretty crap compared to yours. I speak a little French (not fluent), even less Italian and pretty much zero German. I can make sense of written French because I can read it at my own pace, but any native French speaker will talk too fast for me to keep up.
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Won't get fooled again...

 
Laverdalothar said:
I am also diagnosed with Dislexia)
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Rather appropriately, you mis-spelled dyslexia. :)

I'm reasonably OK with spelling, grammar and punctuation. But I seem to have the numerical equivalent of dyslexia. I often transpose the numerals in multi-digit numbers. I often bugger up phone numbers and I always have to read and re-check what I've written when entering numbers on forms or a computer. It's a bit of a hazard when paying bills or transferring money on line. I've sent money to the wrong bank account on two different occasions. I was unlucky in each case that the account number I entered was somebody's actual account. If it had been an invalid account number, the transaction wouldn't have gone through. Fortunately, on both occasions, the owner of the account agreed to refund the money. They had no legal obligation to do that in Australia. If they'd decided to keep the money, there would be little I could do. One of the incorrect transfers was $8,000 for a motorcycle I'd bought. I was shitting myself that I wouldn't get it back.
 
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