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kz650 B melting coils
- adbz650
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My questions are : Why would the coils melt ? gone through three and they all give out on the junction where the bolt tab joins the main body ?
Do I need to fit the B model coils? a coil is a coil right ? or wrong ? I have picked up some B model ones but will have to change mounting point / wiring as factory fitted HT leads not long enough ? Can oneone tell me if the F model has the same resistance as the B or point me in the right direction .. local Kwak dealers / motorbike shops wont touch her and sitting staring and praying is nt helping me .. many Thanks Adam
hard tail chop z650 named Christine
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- Nessism
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- wex652
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If you have points ignition and you have the ignition switch on and the engine stop switch on, with the bike not running a coil may get hot. This is because if the points are closed there will currant flow to the coil.
Not sure if it’s the same for bikes with electronic ignition.
Anyway, I noticed this with my Z650B1, so if I have the ignition switch on and the bike is not running, I always make sure the engine stop switch is off.
Also, for points ignition the coil primary resistance will be about 4 Ohms. For electronic ignition it will be about 2 to 3 Ohms.
Brian
Brian
Z650B1
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- adbz650
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hard tail chop z650 named Christine
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- adbz650
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Its electronic ignition. Unfortunatly no kill switch, the electrics have been stripped back.
What causes the melting in the first place ? will try and post some pics this afternoon
hard tail chop z650 named Christine
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- SWest
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Steve
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adbz650 wrote: ... electrics have been stripped back.
What causes the melting in the first place ?....
Would suspect that an internal short could cause the melting, or where the coil is allowed for whatever reason to receive continuous battery voltage even when the engine isn't running or in the process of being started (one example would be inadvertently leaving the ignition switched ON when parking the bike).
My Z1 coil failed one time while riding in Yellowstone, where inspection revealed melted black goo oozing from the old original coil. Not roadside-repairable absent a spare coil, but thankfully a Z1 can motor along quite capably while hitting on just two cylinders. And in this case until locating another coil. Which was all it took, and thankfully without being associated with the regulator/rectifier or wiring incident to the regulator/rectifier.
When traveling with another Z1 rider, where both coils crap out on one of the bikes, a less risky alternative to towing (difficult without a rope, but not impossible) , one good coil may be pirated from the other bike and temporarily installed whereby ride-ability of both bikes may continue.
Then there's always the option of parking and securing the disabled bike as best as possible and continuing as a passenger on your traveling buddy's bike --- a likely fave when it's dark and wolves have started howling. :woohoo:
Shoo, wolf. or I'll sic this Dyna-S on ya!
"Harley Helper" (KZ900 LTD)
Good Fortune!
1973 Z1
KZ900 LTD
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- loudhvx
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If you are running electronic ignition coils with points, that could cause them to heat up quite a bit, but the points would also be wearing pretty fast.
The older points system uses 4 ohm coils.
The electronic ignition system uses 2.3 ohm coils.
They should not really be interchanged.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
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- adbz650
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Its running a new newtronic electronic ignition system .. I just put volt meter on the coils and they are live with ignition on but motor not running ?? Have checked wiring but no obvious short ... will keep looking.
Whats bit about not being interchangeable .. Im looking at getting a pair of coils off the F model... the screw on caps will allow me to fit the longer HT leads I need.. all help and advise greatly received and appreciated
hard tail chop z650 named Christine
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- loudhvx
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You will have to refer to their literature to figure out what coils you need, with regards to ohms.
If the coils have 12v on one primary wire, and near zero volts on the other primary wire, with the motor not turning, the coils can overheat.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
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hard tail chop z650 named Christine
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hard tail chop z650 named Christine
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