Results from GS911: K1200RS running rich and hesitates - - Excellence in Motion
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post #1 of 2 (permalink) Old Jul 21st, 2017, 3:53 pm Thread Starter
Join Date: Jun 2009
Location: Hercules, CA, United States
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Results from GS911: K1200RS running rich and hesitates

Hello, This is my first post here. I have posted my question in GS911 (hex code) forum, but I thought I might get more response here, so am reposting.

My 2000 K1200RS, which I have had for more than 5 years has always run rich. It also hesitates on accelerating but in general I have no problem cruising and it has all the power. I can also smell that the engine runs rich, and fuel efficiency is in low 30s.

I did lambda voltage test and there were long periods of flat voltage, so I changed the O2 sensor. I believe the problem is somewhere else, because this is not the first time I have changed the O2 sensor.

I am posting results after changing the O2 sensor. There are two graphs: First one is while idling and in the second one I tried to increase RPM to 2000 and 3000 and then released it to idle. I noticed that the O2 voltage was showing flat when it idled after revving. Can you comment on these graphs? Engine was hot (tested after a 15 mile ride) in both cases.

I am also plotting the TPS on the graph. It seems to be changing, but I notice that it doesn't follow the RPM properly.
I also have a question regarding O2 sensor itself. Can it go bad by carbon fouling from a rich engine?

I have not really checked the throttle body, air filter and everything that is inside the fairings. If I remove the fairings, I would like to do all the necessary checks and maintenance, so any recommendations will be greatly appreciated!

I have the data for both these tests, so let me know if it will be useful to plot any other variables.

PS: A correction: The blue curve in the first graph is indeed for TPS. The right side Y axis shows ignition time incorrectly (because I had it there earlier and then removed it and then forgot to change it in Kaleidagraph). Thanks
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post #2 of 2 (permalink) Old Jul 22nd, 2017, 3:49 am
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I have not graphed mine like that, I just plot the 02 sensor, looks like this.

Have you reset the Throttle position sensor, (TPS)?
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