Originally Posted by AndyKB
Hello all, I'm a new member to the forum as I'm looking at buying a 1200GT '04 model. Was looking at one yesterday with 96,000klms on it, and the salesman started it up, sounded sweet no strange noises, remus exhaust, (I also have a K100RT '88) but I noticed that it did flutter / hesitate if you gave it any throttle, as it was coming off idle. The salesman reckoned it did it till it was warmed up. I was thinking maybe Throttle Bodies need a sync, but I just saw this post, and wondering if the motronic computer replacement is still valid ( I'm in Australia ).
Will get a test ride on it during the week,and see if the problem is still there once the engine is warm. Is there other things I should look at if it still does it once the engine is warm?? Any advice will be appreciated, really nice bike!
If your dealer is an authorized BMW dealer, he has access to a database of all Service-Bulletin (on-line) and could have easily found it using the search option.
Tell him/her to look for this:
Bulletin No: 13 002 04 (057)
Date published: June 2004
Topic: Throttle response when starting from cold. K 1200 RS/GT, Model year 2003/2004.
For most owners, finding the part number involves removing the fairing, fuel tank.... The Motronic part number tag is on the unit itself (version number is visible on the unit below the Bosch part number - below the barcode). For the dealer, it is an easy task using the BMW diagnostic computer plugged to your bike. If you have a GS911, you can also find the ECU version yourself without removing anything.
My experience: I have seen cases where the new and latest MOTRONIC ECU (BMW part no ending with 296) will fix the cold start hesitation. BUT, I have also seen bikes where the throttle cable(s) free-play adjustment was such that the TPS (Throttle-Position-Sensor) was confusing the Motronic. When the throttle is fully closed (idle-stop), the Motronic is expecting a certain value (tight range) from the TPS - If the cable(s) free-play is too small or nil, this will cause similar symptoms as described in the Service-Bulletin.