So i got an update on my problem.
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My other qestion is about the small vacume hoses that conect all 4 throtle bodys, mine have 4 litle caps that block those ports. Must i have those vacume ports all conectet????
Oweral the bike runs better now bot not ideal.
About the 4 small vacuum hoses / connection:
by design the K1200RS/LT have all 4 small vacuum hoses balancing each other - NOT plugged with vacuum caps. Although I doubt that putting rubber CAP on each will change engine behavior much I HAVE NEVER TESTED SUCH SCENARIO.
The Euro specs K1200RS are built at factory as per my attached photo (you need 5 small pieces of vacuum hoses with 2 small junctions). The USA specs models are slightly different with these small 4 vacuum hoses leading into a fuel-tank vent valve AND a charcoal-canister under seat (as per EPA by law to recirculate the venting fuel vapor from fuel-tank)
Both methods above will work on any K1200RS (without any ECU change) as the fuel vent valve is just missing on Euro specs K1200RS/LT.
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Given your last post, I would also do this to help pinpoint the issues:
Do only one of these at a time and test before trying next one:
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(1) With Ignition OFF, disconnect NEGATIVE battery post for 30 minutes. This will clear MOTRONIC-ECU memory for old adaptive settings. Careful when you connect back the Negative post as there are 2 large BLACK wires on the K1200RS negative battery post (not only one like some other bike)
(2) If the above does not improve your engine behavior AFTER 2 rides (at least 20 minutes with various RPM), you could also:
- disconnect the Oxygen sensor completely for a test ride (under seat) combined with another MOTRONIC memory reset above BEFORE the engine is started.
- Although the oxygen sensor by itself alone, has NO important effect on idle issues , riding with no O2 sensor signal should change the engine behavior as the ECU goes into another state. This might give us a clue about causes - assuming the symptoms / problem improve.
(3) close all 4 brass air bypass screws, BUT note how many turns for each as you do this. This way you can put them back the way they were after - if test is not satisfactory. Given that you may have air-leaks from shafts, this should reduce amount of air at idle slightly. These screws only exist on 1997 up until mid-1998 models.
Always reset Motronic-ECU memory for 20 minutes each time you try something new BEFORE starting the engine for a ride.
IMPORTANT for any modern EFI motorcycle with electronics: ALWAYS do any connect / disconnect of anything electrical ONLY while the ignition is OFF.
In case of doubts about the item being worked on, always disconnect the negative Battery pole before you do any electrical work. Do NOT play with Positive battery pole unless you need to remove the battery completely - if you need this then Negative pole must be removed FIRST and reconnected LAST.