I think my ignition coils are breaking down.

Can someone please tell me the symptoms of ignition coils breaking down please?

Guess not.

[yorkie_chris]

Misfire under load or any other random misfires that are hard to trace.

Mine cuts out intermittently at about 6500rpm... sounds about right

Mine ran on one cylinder, but the second would fire randomly.

[NedSVS]

Originally Posted by carpet monster

Can someone please tell me the symptoms of ignition coils breaking down please?

Originally Posted by carpet monster

Guess not.

I think the lack of replies is pointing to the fact that this is very rare/unlikely. Maybe the vibrations are just right at 6500rpm to affect a poor contact or breaking wire? I wouldn't be in too much of a hurry to buy replacement coils until I had done some investigating.

[johnnyrod]

does it happen more with a hot engine than cold?

Had this on my K6. Cutting out was intermittent to begin with, usually when hot, then the front cylinder stopped firing completely one night, ended up coming home on the rear only. If you've done the simple check first (visible plug condition) Remove the spark plug from the cylinder, keep the plug on the lead and hit the starter with the plug (spark end) pointing at the head or frame. Hold the plug by the plastic cap before you turn over. Check the condition, colour and frequency of your spark. Nice healthy spark is blue, not so good is yellow to brown.

If you deem the spark unhealthy, try another plug in good condition and repeat the process.

My spark was brown, very weak and intermittent. I bought a moulded coil, lead and cap from ebay for a fiver. Mitsubishi.

This was all great fun in the dark.

Once thing I did notice is I needed to bump start the bike after is didn't want know to from just the starter.

Good luck!