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r80 ignition problems
- Thread starter 406409383
- Start date
guenner
Member
That's a standard ignition module and since you said it is new the heat paste should be OK.
The ignition module and its heat sink should not get that hot in a few minutes. After a longer ride, yes!
Measure the primary coil's resistance - across the two spade connectors on the coil. Should be around 0.6 Ohm.
Why did you install a new ignition module?
Does it cut out when you ride?
It seems you are in Europe. You may also find help at the www.2-ventiler.de forum (in German language, though).
/Guenther
The ignition module and its heat sink should not get that hot in a few minutes. After a longer ride, yes!
Measure the primary coil's resistance - across the two spade connectors on the coil. Should be around 0.6 Ohm.
Why did you install a new ignition module?
Does it cut out when you ride?
It seems you are in Europe. You may also find help at the www.2-ventiler.de forum (in German language, though).
/Guenther
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zagurai@seznam.cz
New member
That's a standard ignition module and since you said it is new the heat paste should be OK.
The ignition module and its heat sink should not get that hot in a few minutes. After a longer ride, yes!
Measure the primary coil's resistance - across the two spade connectors on the coil. Should be around 13 Ohm.
Why did you install a new ignition module?
Does it cut out when you ride?
It seems you are in Europe. You may also find help at the www.2-ventiler.de forum (in German language, though).
/Guenther
Hi, the inductor is new too, but I measured only 0.6 ohm between contact # 1 and contact # 15. But the inductor coils normally, the motorcycle runs. the motorbike is a special wiring, it is a custom construction scrambler, I finished it last week.
zagurai@seznam.cz
New member
Silicone BERU with copper core
zagurai@seznam.cz
New member
I really do not know, it is a standard cable. How do I measure this resistance? Thank you.
zagurai@seznam.cz
New member
I'll make it easier. Is he able to tell how warm the ignition module should be after about 1 minute of idling? Is it not possible to keep your thumb on aluminum, or is it just lukewarm or something in between? Simply, what is its operating temperature?
guenner
Member
I never burnt my fingers on the ignition heat sink of my R100GS.
I have never heard or read about the operating temperature of the ignition module's heat sink. There is certainly a limit of 100+ degrees Celsius for the few components inside the ignition unit. So the heat sink temperature should be well below that.
Take a measurement of yours with a remote temperature gauge and we'll have a number to talk about.
Could be that the voltage regulator inside the ignition module has to dissipate to much energy. What is the max charging voltage you see at the battery with the motor running at >2500 RPM?
Take the ignition wires completely off and measure the Ohms between the ends: 5kOhms!
Try another ignition module!
/Guenther
I have never heard or read about the operating temperature of the ignition module's heat sink. There is certainly a limit of 100+ degrees Celsius for the few components inside the ignition unit. So the heat sink temperature should be well below that.
Take a measurement of yours with a remote temperature gauge and we'll have a number to talk about.
Could be that the voltage regulator inside the ignition module has to dissipate to much energy. What is the max charging voltage you see at the battery with the motor running at >2500 RPM?
Take the ignition wires completely off and measure the Ohms between the ends: 5kOhms!
Try another ignition module!
/Guenther
zagurai@seznam.cz
New member
Hi, I measured 5 Kohms on one and 4.7 Kohms on the other cable. Could this be a problem? Thank you.
zagurai@seznam.cz
New member
Thank you. So I'm clueless.:-(
zagurai@seznam.cz
New member
Maybe I know about the problem. On the secondary winding of the ignition coil I did not shoot any ohm. But how can the engine run?
guenner
Member
There is no connection between the spade connectors (primary coil) and the round spark plug cable connectors (secondary coil) for your type of coil.
From the picture it looks like a new Bosch coil which should be compatible with your ignition module. To be sure contact BMWBayer to verify that.
/Guenther
From the picture it looks like a new Bosch coil which should be compatible with your ignition module. To be sure contact BMWBayer to verify that.
/Guenther
zagurai@seznam.cz
New member
Thank you for your patience. I checked the compatibility and everything is fine. Is there any way to measure this coil? The motorcycle works, but has shut down several times. I think it's the warming ignition module.
guenner
Member
Only its resistance: ~0.6 Ohm primary coil, ~13 kOhm secondary coil.
Some older coils have been reported to produce a short when heating up. Is the coil getting hot as well?
The ignition system on the airheads is very simple. From what you told me yours SHOULD work.
Maybe and just maybe, the new ignition system doesn't have heat paste between the ignition module and the heat sink. Might be worth to unscrew the heat sink and take a look.
Or...find someone who can give you a working ignition module just for comparison!!!!!
/Guenther
Some older coils have been reported to produce a short when heating up. Is the coil getting hot as well?
The ignition system on the airheads is very simple. From what you told me yours SHOULD work.
Maybe and just maybe, the new ignition system doesn't have heat paste between the ignition module and the heat sink. Might be worth to unscrew the heat sink and take a look.
Or...find someone who can give you a working ignition module just for comparison!!!!!
/Guenther
Last edited:
