Join Date: Aug 2006
Location: Chicago, IL, USA
oooohhhhh I could go on for pages... but it's late and I have to get up early tommorrow.
From what I understand and have read, the k1200r snd s snd gt are sequential fire. The crank signal is off the front of the engine and is a x-2 teeth confirguation. Can't recall how many teeth. And it actually is the crankshaft gear that drives the oil pump.
There is a usual camshaft sensor near the cam chain tensioner measuring 1/2 engine speed.
Both of these are pretty standard for most motorcycle efi's.
The computer HAS a diagnostic plug that can access the computer but until recetly, the only way to get into the computer was to physically open the ecu and solder in some leads and do some BDM programming.
Recently, companies such as Rexxer and others have felt it profitable to finally offer reflashing services of the ecu. I know Max BMW motorcycles of Connecticut does this service as well.
Before this, piggyback computers (power commander, rapidbike) were used to fix the problem you relate. Over here and elsewhere it has been named the bucking bronco syndrome. LOL.
What year is your bike? Make sure that the dealer has performed all the ecu updates as BMW has reprogrammed the fuel maps presumably to help with fueling over the course of the k1200r lifespan.
If that doesn't work, consider getting a reflash.
The causes of your problem are multifactorial. First, the engine suffers from a significant amount of intake charge contamination due to the high overlap/long duration cam needed for high rpom performance (evidenced by the k1300 bikes having shorter duration cams and presumably less overlap). secondly, low speed mixing isn't the forte of the k1200 cylinder head (again the k1300 had smaller ports and an UGLY ridge cut into the head just above the valve to promote mixing). Finally, the K12R came with very lean fueling in a large part of the fueling map. Fixing this seems to solve a lot of the driveability problems.
I'm presuming that the bike is in good working condition, of course...
'06 K1200R- in pieces
'73 Honda CB500F- slow but fun.
'77 Yamaha XS 750 triple- kinda