94 R1100 RS Seems to have a miss.

I went to start it today and it seems to run on one cylinder. However, both plugs are firing and yet it will not run cleanly. Thoughts on the issue? I'm supposed to go on a 12 day ride starting the 17th of July.

Did you just fill up the tank before this happened? Try treating the tank of gas with HEET or whatever other treatment will absorb water in the tank.

Did you do any work on the bike just before this happened? Go back over what you worked on.

Try putting in new spark plugs. Cheap, quick, won't make it worse even if it doesn't fix it.

Found an old thread for the same problem

I found a reply to the same problem from 2005. I followed the steps and it still seems to run like only one cylinder is firing. The right hand injector seems to spray quite a bit more than the left. I suspect it is a faulty injector.

derbyl said:

I found a reply to the same problem from 2005. I followed the steps and it still seems to run like only one cylinder is firing. The right hand injector seems to spray quite a bit more than the left. I suspect it is a faulty injector.

Click to expand...

A clogged injector is not necessarily a faulty injector. A drop of water can clog an injector with just surface tension. And injectors can be cleaned. I would call it a clogged injector.

If you had the tank off, the classic problem is that the right-side throttle cable is not properly seated in the adjuster at the throttle body.

I had the tank lifted after the issue appeared

I had lifted the tank thinking I'd need to do that to remove/work on the throttle bodies. The left injector didn't spray as well as the right and the right runs. I just received and installed a new left injector and the problem still exists. Any thoughts on next steps? Please advise. Thank you.

I used a procedure similar to that shown in the video below to clean the injectors on my 94 R11RS. I used a 9-volt battery to cause the injector to operate whilst spraying the carb cleaner through the injector. I sprayed cleaner through each end. I directed the output cleaner spray into a wide-mouth bottle (old orange juice bottle) and had the garage door open. Safety glasses or other suitable eye protection is suggested; carb cleaner burns when it gets in one's eyes!!! I was quite surprised at how dirty the throttle bodies were. These were cleaned along with the fuel injectors. Bike still runs very well.

<iframe width="560" height="315" src="https://www.youtube.com/embed/rUUgR94drxg" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

Some while ago there was discussion about using "better" injectors (e.g., those used on more recent bikes). Tills in Germany sells matched injectors thought to give better performance -

https://www.tills.de/product-47.html?language=en

New or re-worked injectors can be found from other sources -

https://www.euromotoelectrics.com/category-s/1722.htm

https://www.ebay.com/itm/3339573247...ke:BMW&hash=item4dc1685ff5:g:L-AAAOSwQQpgdPv0

https://www.ebay.com/itm/2536054342...FI1Rd64gBCssU2D3Exds|ampid:PL_CLK|clp:2499334

I have tested for spark and injector function. The right cylinder ran and the left injector didn't spray. I ordered a new injector from Germany 5 weeks ago and installed it yesterday. The left cylinder still does not run. The engine ran fine the day before this happened so I don't suspect compression. I erred by putting regular in as I had been riding my DR650 on a dual sport ride for the previous 2 weeks. Not sure if this would affect only one cylinder or if there might be other issues. Any help would be greatly appreciated.

HES? It signals plugs and injectors, I believe. Has it been updated with new wiring?

I doubt it would be the HES - both fuel injectors fire from pin 27 of the Motronic, yellow/gray wire.

Fuel distributor? Either the left-side feed is narfed or a connector isn't seated (line to that injector).

Pauls1150 said:

Either the left-side feed is narfed.....

Click to expand...

Go ahead, use that technical jargon to confuse us further.

Some people may get confused by the more common N.F.G. - Non-Functional Gear