Aah the joys of 1200GSA ownership ...
I had exactly the same symptoms, removed the key, ignotion stays live, thumb the starter and you're away with the bike.
Got it BMW assist recovered to dealer (about 45miles away), they diagnosed a failed ignition asembly, ordered and replaced in about 3 days. BMW assist returned bike, ran fine.
Two weeks later, exactly the same symptoms, same palaver, dealer replaced again, returned by a chimp working for BMW assist who had the GSA on a fold-up trailer behind a Vito.
Got lost getting here, spent 25mins on phone finding me, then drove past me waving at end of my drive and proceeded to drive 2 miles up a lane onto a farmyard, thru farmyard into field access and bogged his Vito down in the field --- why you ask?? --- because it transpires he can't reverse with a trailer ... I walk after him and eventually find him after long (exasperated) mobile conversation. Then spend 20mins getting bike off trailer in muddy yard (which he also doesn't know how to do!) so that he can dismantle the trailer, pack it and hopefully unbog his van.
To be honest, by that point I had had enough and rode the bike back to house, covered in shit due to his incompetent attempts at unsticking the van. The bike was so plastered I had to hose it down to even see the paintwork.
Does the saga end ..... nope!
Ran fine for a couple of weeks, then at 9:30pm, 150miles from home, put key in ignition to find that the bike wouldn't fire due to EWS! warning, ie. immobiliser triggered. The antenna ring around the ignition circuit had failed, bike and me recovered to S. Wales, 2am at home, 2-3hrs kip then back to site by car as I had to be back at site by 7:30am. Bike recovery this time was fine, but BMW assist then arranged a further recovery of the bike from home to dealer, more problems as a single driver turned up to load bike on trailer even tho I advised no one able to help.
Bike returned 3 days later with new antenna ring (from factory), this time on a collapsable trailor again, now with a broken strap supposedly holding it on and frame wear (ie. paint removal) where it was braced.
I await with interest my next ignition problem ... even dealer couldn't believe it third time when I rang, "Didn't we just do this a week or two ago ...?".
So:
- Rydales Cardiff, good service, good feedback
- BMW Assist, good response on phone, good feedback until recovery arrive, crap communication with dealer, mostly crap sub-contracted recovery units as they know p*** all about transporting bikes securley and safely
- R1200GSA, fantastic bike, but ignition glitches getting me down, ride around the world on a GSA, no thanks, the electronics/electrics are too complicated to be that far from a dealer ...
BTW, as a final aside ... whilst waiting on one of the last recovery trucks to turn up I had 30mins chatting with great driver, he estimates that in the last year of bike pickups he had done, 95% of work had been BMW bikes (about 20 bikes), with most of these being electrical/ignition faults.
Have fun