Failing coil symptoms

[KSMITH]

yes I agree with you steptoe, but it is a very good indication of output condition.

trouble is the bikes have 2 coils per cylinder so it make sometimes somewhat difficult to diagnose.

i battled for weeks with mine - rode the bike with all sorts of coil plugged/unplugged combinations and only figured out which coil was messing me around by doing the idle spark jumping to the engine test and could see the spark. replaced the one coil that had a weak yellow spark and hey hey hey...... the bike was totally different!

can be O2 sensors - there is always a first time that may be acting up different to everyone elses bikes and that is why it is sometimes so difficult to come to a conclusion of the cause of a problem, by simply taking for granted the comment " no they never give trouble"

i did, as I heard that the coils "never give trouble " and chased my shadow for weaks on end with an idling problem.

still up side - i learnt a lot about these bikes , am a lot more confident to work on them and appreciate the bike more.

Bendy toy - you will crack it and when you do you will feel like a kung fu ninja with black belt!

let us know how you go

 

[Bendy toy]

Thanks @KSmith and to Steptoe for his input.

The replacement lambda does seem to be dodgy and it rattles so its being replaced anyway. The other issue is the bike runs fine at speed but stalls easily when I stop. Maybe its the mixture being messed up but it could be I have another faulty coil. Time will tell.

I'll try the spark test with the coil hot when any winding faults tend to be worse.

 

[Bendy toy]

Stalling was the other coil failing.

The North Oxford service guy did say that when one coil goes, the other is often close behind. It also has a new BMW Lambda at silly money but what can you do the generic was rattling and the original BMW chucked away after I cut the cable connector off.

The fuel consumption is still in mid 40s when it should be high 40s so things are still not right but thats for another day.

 

[Steptoe]

.

trouble is the bikes have 2 coils per cylinder so it make sometimes somewhat difficult to diagnose.

FFS, having 2 coils per cylinder makes it easier to find the faulty one as you can ride with one coil at a time.

 

[Bendy toy]

When my first primary coil failed the bike ran on one cylinder. When revved it reluctantly kicked off onto both sounding like a 2 stroke coming on the pipe.

Both plugs were badly sooted which led me to think it was a lambda problem. Being not too bright I didnt swap the sensors left-right before getting new (generic/universal) sensor.

I still have relatively poor fuel consumption so maybe my secondary coils are also failing. Disconnecting one or the other 2ndry with primaries connected makes no obvious difference.

But after getting stung, I'm not rushing to buy new ones just yet.