Yep, this is what happened on Sunday. Just riding along at about 60, and tehre was a fairly loud bang. At first I thought a tyre had blown out, cos the bike was all over the place.
My mechanic opening it up yesterday and this is what he found. :ermm:
Tightening valve clearances usually result in burnt valve seats. these look pristine and squeeky clean so I’d hazard a guess that somethings gone wrong with the timing mechanism or someones ragged the fugg out of it and bounced the valves:w00t:
looks like a dropped valve to me, could be due to a missed gear change or just bad luck and a faulty component the rest of the damage would be caused by the valve head crashing around before burying itself in the piston, how old is the bike? if its low mileage even if its out of warrenty you might get some help from the makers as a good will gesture, cant hurt to ask.
Yep, my mechanic is pretty certain that is what happened. The bike is 2.5 years old, so 6 months out of warranty. I have contacted BMW this morning too to see what they say.
if they won’t go fully for it, then push for parts supplied FOC, its likely that if you make a big enough noise that they will at least think about it. also its worth logging onto the various owners forums to see if this has happened before (I haven’t heard of it as a problem but who knows ?) here is a good resource
I emailed BMW UK last week. They came back and said this fault was very rare, and to take it to a BMW dealership for investigation. So managed to get it in the back of a mate’s van, and drop it off at Vine’s in Guildford. While we were unloading it, a couple of passing mechanics gave it the “Oh dear, that’s not good…”
Anyway, Monday morning they call up, and tell that BMW are going to do it as a goodwill gesture !!
If I contribute to the labour, I also get a 2 year warranty on the parts. Not bad, seeing as the parts alone are £1100 plus vat!