Hi guys I am new to these things I just had it for service they said computer shows the bike has low tension the guy said could be spark plugs or coils it seems to be running fine how can I check which it is coils are quite expensive 
2009 GS
- Thread starter scot
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Start with the cheapest;; new plugs then see how it goes from there; it seems like it feels fine to you anyway.Hi guys I am new to these things I just had it for service they said computer shows the bike has low tension the guy said could be spark plugs or coils it seems to be running fine how can I check which it is coils are quite expensive
That's what I was thinking or just carrie on until a fault appears it was difficult to understand I live in Spain but don't speak muchStart with the cheapest;; new plugs then see how it goes from there; it seems like it feels fine to you anyway.
I've just clocked your location; if your owt like me with just one tongue in yer he'ed it will be hard;That's what I was thinking or just carrie on until a fault appears it was difficult to understand I live in Spain but don't speak much
There’s another recent thread titled “ ticks over smooth etc etc “ I posted on it, which maybe your problem, but coils don’t register on diagnostic computers ? Are the people who serviced your bike familiar with BMW’s ? If they are they should know how to check the main coil caps/sticks. Here’s the copy and paste from the other thread, it’s a very simple and quick check, takes 5 minutes……. “A very common problem are the main coils. Very very easy to check. Disconnect the connectors on both lower secondary coils on each side, leaving only the main coils connected. Start bike and see if it runs on both sides. Give it a couple of revs to see if they break down. If not firing on one side reconnect the secondary coil of that side and see if it now fires on that side.”.
Quick Q Neil, why is it the mains tend to be the ones that fail, and not the secondarys?
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