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Old 11-11-2014, 06:08 PM   #1
scorch OP
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Trouble with 1994 bmw r1100rs

I bought my first bmw.. And ive been having some problems.

The clutch is slipping at high rpms if i rev it hard.

The mpg is about 30mpg

and the bike seems to be running rich, the exhaust after every ride is sooty black

I replaced the oil, sparkplugs etc..

Around 1k rpm to 1.5rpm its really lumpy and when idling it dies often and vibrates alot. Is that normal?

There is a leak in the right cylinder which is very small, but it seems i might need a new gasket.

The mpg is really what bothers me, as i need it to commute and rack up quite a few miles.

There is no cat plug, but i hear that 1994's dont have them and are hardwired?

Thank you for our input.
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Old 11-11-2014, 07:05 PM   #2
Mituk
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You should post this over on Gspot -- that's where you're going to get the best help. The lumpy idle and vibration is definitely not normal -- mine are smooth through 4500rpm or so, when some vibration creeps in. I own a few R1100 bikes, and the valves/TB synch can account for a lot of vibration. You are talking about two different issues -- the poor running and the clutch slip - I would start with the basics for the engine:
- Is it burning oil? What color are the plugs? You said you replaced them, but nothing about condition.
- Valve adjust and throttle body sync - these should be definitely be done. Your vibration description could certainly be caused at least partially with these being way out.
- Don't worry about the cat plug or the FI internals yet -- those are pretty reliable and will yield more incremental improvements, not the way out-f-spec behavior you are describing
- Injector condition -- are you getting a relatively clean pattern, or is it more of a stream of fuel?

I don't think your small leak is related to the performance you are experiencing.

Clutch -- First, make sure it is in proper adjustment. Once you are certain of that, if it is still slipping the most likely culprit is a leaky seal, allowing oil to get on your clutch disk. Whatever the cause, if it is slipping you are going to have to pull it apart to find out what it is, and will likely mean a new clutch.

My R1100's usually get around 42 mpg with varied riding -- though I have recorded 50 if I kept it around 55 mph, which I almost never do.
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Old 11-12-2014, 03:25 PM   #3
scorch OP
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im going to try doing a valve adjustment and tb sync this weekend.

i just noticed too that my front brke light will not go on with the front brake lever, but it will with the rear brake lever.
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Old 11-12-2014, 08:19 PM   #4
AllBlak
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Leak of...
Oil?
Fuel?
Gases?
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Old 11-13-2014, 01:49 PM   #5
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Nowhere to go but up.
It should idle smoothly and pull hard as you start out in first.
No hesitation, no lumpiness, no stalling.

I wonder if the TPS has been tampered with and is causing it to run rich.
You might want to verify that first.

When you do the TB sync be sure to completely remove the BBSs, they are almost certain to be coked up.
Brake light can wait, you still have the rear lever.
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Old 11-15-2014, 09:58 AM   #6
scorch OP
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throttle sync

https://www.youtube.com/watch?v=pT1s...ature=youtu.be

cant get the other screws to adjust anything
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Old 11-16-2014, 08:16 PM   #7
XtreemLEE
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Your throttles bodies are on different planets, they are so far off. I am willing to bet the bike will run better with a spark plug removed from the left cylinder. You tb balance is so far off one cylinder is fighting the other, not good...
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Old 11-19-2014, 06:48 PM   #8
ThorRex
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One of the throttle cables pulled out of it's seat at the throttle body? Pretty common malady and an easy fix...
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Old 11-23-2014, 05:57 PM   #9
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haynes

yes, Haynes sells an excellent service manual for that bike . i own a early RS (4-93) and absolutly love her . the bike is not that hard to work on once you sit done with manual and read it. i can help with the repair questions once you get familiar with her .
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Old 11-23-2014, 08:06 PM   #10
Bueller
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Quote:
Originally Posted by scorch View Post
throttle sync

https://www.youtube.com/watch?v=pT1s...ature=youtu.be

cant get the other screws to adjust anything
Don't know I've ever seen an oilhead so far out of whack. You really need to do a full zero - zero.
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Old 11-30-2014, 05:23 PM   #11
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i had a fellow bmw rider help me with the bike. The guy was a bmw genious. He got the bmw to run like new. Im at 41mpg now, and it doesnt surge or anything. Apparently it was the butterfly was stuck a little open. I appreciate all the input here guys. Im riding it to work tommorow.
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