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Discussion Starter #1 (Edited)
Hi firstly, on here for my mate as his 12s as been out of action 2mnths..
Basically bike died whilst out locally , he got it going to home, not very sweet on power and initial diagnosis from well run local independent was to replace coils for 2nd time, the bike will run but after that , it now smokes a lot ,don't now whole story there, the coil replaced and was bit 'better' but and it went to ocean BMW main dealer, who from what I briefly heard, has replaced a few parts ( without asking him!) tps included but they also don't have a clue what the issue is, they haven't come across it before and he is very worried about a LARGE bill with nothing at the end .So I figured I would try an owners forum for any possible advice other than break it for spares<img src="http://www.k-bikes.com/forums/images/smilies/frown.gif" border="0" alt="" title="Frown" class="inlineimg" />
It's standard bar an aky silencer and has decent mileage, used regularly, I liked my quick ride this year, bar the g/box, I have tried going through posts but nothing similar on here.
ideas?? Updated this already after a chat as he didn't mention the smoking issue. I would personally have gone mental at the independent, but hey ho..
 

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My 12S had a coil failure.
It was caused by a valve failure. If I had known the valve was failing then obviously I would have done something about it before it got worse (and it did get much worse).
Check the exhaust temperatures with a non-contact thermometer. If they aren't equal then something bad is happening and it may not be fixed by electronics or tuning - it could be mechanical.
 

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Firebeast, I'm having a little difficulty following your post; needs to be a little more specific. For one thing, What's "decent miles"? Is it blowing white or black smoke? White is oil, black is gas. If it's white, oil comes past rings or past valve guides. Either is not good. Rings is worse and probably means motor is a goner. Since the advent of electronic ignition and injection, valves fail one at a time less then in the past because the engine runs more uniformly. The whole valve train wears out about evenly. Black smoke can be nearly any of the sensors but should show right up on the diagnostic scan as will a leaky vacuum line.

The coil sticks on all the K-bikes should be lasting 40 of 50 k miles before failing. Is this suspect coil the same one or another or did he replace them all twice? A coil stick starting to go will usually miss fire at high rpms before it fails completely so it gives you a warning.

As for how a dealer does work, you have to be very insistent if you want to put limits on what they do. Their MO is to keep working until it's fixed unless otherwise instructed. The way to manage it is to just have them do a the diagnostic and let you read it before progressing. Personally, I do all my own work and only rely on the dealer to run the diagnostic especially with electrical issues. If it looks serious, you need to do a compression check.
 

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Discussion Starter #4
Firebeast, I'm having a little difficulty following your post; needs to be a little more specific. For one thing, What's "decent miles"? Is it blowing white or black smoke? White is oil, black is gas. If it's white, oil comes past rings or past valve guides. Either is not good. Rings is worse and probably means motor is a goner. Since the advent of electronic ignition and injection, valves fail one at a time less then in the past because the engine runs more uniformly. The whole valve train wears out about evenly. Black smoke can be nearly any of the sensors but should show right up on the diagnostic scan as will a leaky vacuum line.

The coil sticks on all the K-bikes should be lasting 40 of 50 k miles before failing. Is this suspect coil the same one or another or did he replace them all twice? A coil stick starting to go will usually miss fire at high rpms before it fails completely so it gives you a warning.

As for how a dealer does work, you have to be very insistent if you want to put limits on what they do. Their MO is to keep working until it's fixed unless otherwise instructed. The way to manage it is to just have them do a the diagnostic and let you read it before progressing. Personally, I do all my own work and only rely on the dealer to run the diagnostic especially with electrical issues. If it looks serious, you need to do a compression check.
Thanks for both replies , I am waiting to hear back from him in the morning to ask him your questions.
I have carb'd bikes so don't even need diagnostic help and do everything bar suspension tuning, so agree on that,,
I will get back to you soon as I have more answers ,
 

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Discussion Starter #5
Had another update, the smoke was black, smelt fuel rich , it was running rough when the local place got it going again , 30k mileage, ocean main dealer has spent fair amount of time on it, it's been striped right out,with no joy as to the problem, tho not charging much labour luckily.
When I am next passing I will drop in to ask about what has /hasn't been checked over and post back on here, incase anyone has ideas..
 
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