Question about 2007 BMW K 1200 GT

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Plug wire OK, So I'm putting new plug wires and caps on the K 1200 GT I'm restoring and I noticed a difference in Ohms between the new set and old set. My old wires with no caps are showing .2 Ohms New wires with no caps are showing 11 K Ohms What gives?

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Did you buy the copper core (Low Ohms) or the carbon core (High ohms). The higher ohms will give you a higher voltage spark, assuming your coil can deliver it.

Posted on Nov 20, 2008

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Only one spark - won't start 1976 harley davidson 1200

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How to test a motrcycle twin ignition coil

To test a twin ignition coil on a motorcycle you will need a pocket multimeter.
With the meter set to kilo-ohms(1000 ohms) scale,place one test lead into one spark plug cap & the other test lead into the other plug cap.(this is called the ignition coil secondary resistance) The reading should be around 20-40kilo ohms.
If a high reading exists check again with spark plug caps removed(they un screw from the lead) then check caps seperate. Caps typically read 5 to 10 kilo-ohms.

A faulty plug cap is not as un-common as you might think.

To test ignition coil primary resistance set the meter to ohms(lowest scale) Place one meter test lead to the small wire going into the coil & the other test lead onto the coils body(where its metal) The reading should be only 2 to 5 ohms.

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1985 1200 aspencade, i sold this bike 18 years ago, bought it back from same needs a lot of work cosmetically,which will be easy enough. my main problem is an inability to tick over,very rough...

I drove a Goldwing home like that and was mad at myself for not putting the spark plug caps on that I had in my pocket the whole time. Go match up a set of 5000 OHM "NGK" brand spark plug caps and replace all of the old plug caps. They simply unscrew off of the end of the wire. The new caps screw right on. Do not worry about the double rain covers ( they will fit with the NGK plug caps) they really are not necessary. It sounds too simple but I think you will be surprised when this works. You can test the caps with a voltage meter they should read 5000 OHMS no higher or lower. The resisters burn out with time and performance suffers. Let me know how this works for you. The NGK brand plug caps are like the OEM caps (same brand) but they will only cost around $5 each.

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My 1985 Honda 1200 started to lose power when under heavy load, miss fires. Is there a diagnostic test that will show if there is a weak ignition coil. Replaced spark plugs with some improvement.

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Unscrew the plug boot from the wire and look at the tip of the wire if you see some blue or greenish corrosion cut off about a 1/4 inch of the wire and replace the boot on the wire Ihad that problem before on a 89 CB 750

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Try the cheapest route first. Have you installed new spark plugs? Spark plug caps are notorious for going bad on this model. Unscrew the caps from the end of the wires and check them with an ohm meter. If they read higher or lower than 5000 ohms, replace the spark plug caps. You might also have a bad coil wire. Unfortunately, the coil and wire are sold together. You could spray some water on the right wire, when it is dark, to see if there is arcing or shorting on the wire. If so, replace the coil and wire. New Honda part if available, a good salvage part It might be just as old or as bad as the one you take off.), or Accel makes some good aftermarket coil sets with wires.

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This is strange. I've been working on Harley's for almost 40 years and I've only run into two bad coils on the later model bikes. Are you using original equipment coils? If so, are you using the correct ones?

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1 Answer

Plug wire help

Did you buy the copper core (Low Ohms) or the carbon core (High ohms). The higher ohms will give you a higher voltage spark assuming your coil can deliver it.,

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