Join Date: Sep 2008
Location: Honolulu, HI, USA
Because at startup, there is little oil left between the plates of your clutch. After some running two things happen: the oil thins (a little, most oils pretty viscosity-stable now) and oil gets between the clutch plates, as it's supposed to.
K12/K13 clutches and their operating characteristics have been beat upon for ages on this and other similar forums. BMW screwed the pooch seems to be the general consensus. Parts are expensive, the clutch plates are only sold as a pack, the clutch components have changed many times, seemingly without getting it right.
I have taken to starting my 30,000-mile 2010 K13GT in first gear to avoid the hideous clunk when it goes into gear. Supposedly the PO put in a Barnett clutch pack; if so perhaps it's time to replace it, but I just dropped $1400 on some other work so the wallet will rest a bit first.
Coming to a stop, I try get into neutral while the bike is still moving. Once stopped it takes six or seven CLUNK shifts between first and second to find the elusive neutral spot. There's so much clutch drag that it's tough to get that "just enough" pressure on the shifter to only go to neutral, not the gear on either side. Feel like an idiot I do, as if anyone cares (but I do). BMW is supposed to be better than that ... NOT.
Makes me really really miss the silent smooth operation of my previous '85 K100RS, which had a dry automotive style clutch. Damn these wet clutches. Still and all the rest of the bike kinka makes up for it.