Vibrations and slight misfire

SpanishJohn

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Hi all,

Headed off to the biker 1066 event at Hastings yesterday, only to be forced to turn round and go home as the bike developed a terrible vibration at speed and also a slight misfire. The bike is now having the valve clearances checked, but so far they look good (and they were only checked 1000miles since anyway). The vibration is mainly on the RHS, the LHS mirror is still and useable, the RHS mirror is vibey and not useable. The throttle bodies have been recently done. The bike is a 2005 GS with 26K on the clock.

From reading other threads, I am beginning to suspect one of my secondary coils may have gone, but I'm not sure how to verify this. According to Haynes I should be able to measure 6Kohm at the coil secondary, but *all* the coils give an open cct reading (???) between pin 2 and the plug connector which I dont understand.

Does anyone have a spare seconday coil set they could loan me to verify my thinking? If I knew for certain one of them had gone I would order a set from BMW.

Thnaks SJ
 
swap coils left to right and see if problem moves sides as well
 
Can you swap the secondary coils? I thought they had different part numbers. One thing I will try tonight is to remove *both* secondary coils and see if it smoothes out...

SJ
 
Can you swap the secondary coils? I thought they had different part numbers. One thing I will try tonight is to remove *both* secondary coils and see if it smoothes out...

SJ

I seem to remember a post that said that coils are polarity conscious (don't know why they would be) and if you measure ohms you may need to swap round test leads to get a result

then again I could be mistaken and talking rubbish, in which case someone will come along and let me know!!
 
The secondary coils are handed but AFAIK are the same in electrical terms and will swap over for test purposes.

I would like to know if any of the coils are the same as used on more commonly available cars - and therefore cheaper.
 


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