roger 04 rt
New member
But why would you want to willy-nilly disable the closed loop operation? ...
Because that is what BMW sold throughout the world when a catalytic converter wasn't required.
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
But why would you want to willy-nilly disable the closed loop operation? ...
There was nothing nilly or willy about it. It was quite deliberate.
Something is broke; the bike surges and does not run properly or I wouldn't be trying to fix it.
And by the way, when you disconnect the O2 sensor on an 1100RT it stops surging immediately. Sure it runs richer, but it also runs better! Why do you think that is? Because the way it processes and handles closed loop operation sucks.
Inquiring minds want to know why BMW set up all the European R1100s to run richer than all the US bikes. Why? Why? Why? Am I the only one that's curious about this?
They could have had the CO pot set up to trim CO to 0.2% +-0.2% and that would have been the same lean, low hydrocarbon exhaust they set the US bikes to.
But BMW didn't do that, they specified a much richer 1.5% CO. Is it because the bikes ran worse with more fuel or is it because they ran (run) much, much better?
If you put a programmable (wideband) O2 sensor on your motorcycle it is easy to get the answer.
Happy Canada Day HW
Well Earle got his CO Pot in the mail and went out last night to hook it up and disconnect the 02 sensor so I can't wait to hear how things turn out.
I too have wondered if there could be differences in cam timing between models. I am pretty sure that is the case between a single spark 1150 and a dual spark model and it could also be different between an RS and an RT 1100 as well. My only experience with the 1100 is with my '94 RSL which was built in 06/93 which makes it one of the first for export. I think it was a special order machine as well.
This is a very discouraging story. Especially since I just picked up the 2000 1100 that I had the owner holding for me until I could get down to Austin to pick it. I test road it again pretty extensively and it had no problems ths I could tell. But all of this work that has to be some just to get the bike to run is disheartening. I bought the bike for my brother who is not mechanically inclined so with only 12000 miles on the bike I felt good that I was getting him a bike that would not require a lot of work. The bike is all stock and the first thing I will do is change all the fluids. Then see if I will tackle the valves. I am afraid to touch the TBs for fear of messing something up. It can not be this bad to own one of these 11 year old bikes can it?
When I bought my used 2000 rt-p, it ran really well. I think it will be fine. My problem is with a lot of the rubber. The tires, valve stems, fuel lines, brake lines are all shot. It's dealing with the deferred maintenance that is killing me right now.