coil problems!!!!!!!!!
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2nd Gear
Joined: Jul 2007
Posts: 6
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coil problems!!!!!!!!!
What could make a coil go bad?I had one go bad(only fired on one terminal) on the way to Sturgis.Bought a brand new one for a Dyna from the stealership.Worked good for a couple weeks,now it's firing good from one terminal and the other one is getting sporadic spark.Tried a different wire,same thing.then I hooked up my old coil with the new one(one coil per cylinder)and it ran fine.
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2nd Gear
Joined: Jul 2007
Posts: 6
Likes: 0
RE: coil problems!!!!!!!!!
oops...78 Sporty...stock coil I guess..Accel wires.As for mounting 2 coils,I just wired 'em up and let one rest on the highway peg,and started up the bike,then shut it off after I found out it ran better
Road Master
Joined: Aug 2006
Posts: 751
Likes: 6
From: 500 miles south from Artic Circle
RE: coil problems!!!!!!!!!
What kind of ignition electronic or points ? having new sparkplugs ?
Both of them needs specific coil, if system is electronic you need coil that has primary resistance around 3 Ohms. If you have traditional points you need coil that primary resistace is about 5 Ohms.
If someone claims that you can use 3 Ohms coil with points he is RIGHT, BUT you need to know that
it's RACING ONLY, coil and points wouldn't last very long.
Same situation when you connect 2 coils in parallel to system, it causes abnormal wear of points
Aslo sparkplug wires: is good to use wires that are desingned to use certain system. Low resistance wires are desinged to use in points iginition but high resistance wires ( carbonfiber ) can be used in both systems.
Low resistance wires isn't recom to use in electronic systems, because of interference and if you have fouled sparkplug it MIGHT damage you electronic ingition module.
Both of them needs specific coil, if system is electronic you need coil that has primary resistance around 3 Ohms. If you have traditional points you need coil that primary resistace is about 5 Ohms.
If someone claims that you can use 3 Ohms coil with points he is RIGHT, BUT you need to know that
it's RACING ONLY, coil and points wouldn't last very long.
Same situation when you connect 2 coils in parallel to system, it causes abnormal wear of points
Aslo sparkplug wires: is good to use wires that are desingned to use certain system. Low resistance wires are desinged to use in points iginition but high resistance wires ( carbonfiber ) can be used in both systems.
Low resistance wires isn't recom to use in electronic systems, because of interference and if you have fouled sparkplug it MIGHT damage you electronic ingition module.
Tourer
Joined: Feb 2007
Posts: 328
Likes: 2
RE: coil problems!!!!!!!!!
I have never seen a stock HD coil fire on one terminal and not on the other, unless maybe corrosion has gotten to the connectors inside the terminal. Getting two coils in a row like that is highly unlikely. I doubt that a coil off of a "dyna" will work correctly on an ironhead.
Is it actually a stock ignition system? You say the coil fired on only one terminal. Are you actually looking at the spark, or are you referring to one cylinder not firing? On a stock ignition setup, you should be able to swap the plug wires at the coil and not notice any difference. Can you?
Is it actually a stock ignition system? You say the coil fired on only one terminal. Are you actually looking at the spark, or are you referring to one cylinder not firing? On a stock ignition setup, you should be able to swap the plug wires at the coil and not notice any difference. Can you?
Road Master
Joined: Jan 2007
Posts: 770
Likes: 2
From: East NM
RE: coil problems!!!!!!!!!
Might be too much resistance in the circuit. Was it on the same cylinder both times? High resistance can result in high voltage at the end of the secondary winding in the coil, causing the insulation beween the winding and coil frame to break down. Also, you have to use a coil made for the type of ignition you have. Breaker point and electronic ignition systems use entirely different coil designs.
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