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Replaced engine and now idling poorly

I know this is an impossible open-ended question, but I'm just looking for some areas that I might not be exploring.

I have a 2001 BMW R1100S and recently purchased a used engine for it. After replacing the engine, the bike starts but idles very poorly. It has the following symptoms:
can't idle without requiring occasional increased throttle
surges
exhaust smells

I ran a compression test on the engine and both cylinders tested at 175 PSI.

It seems like an adjustment setting needs to be changed, but I'm just guessing (that's why I'm here and posted this question)

Thanks, Norman
Old 11-29-2019, 10:08 AM
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unsafe at any speed
 
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check throttle cable ends, to make sure they are seated properly in the little threaded fitting on the throttle bodies.
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Old 11-29-2019, 12:07 PM
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Are the ignition wires to the spark plug new ?
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2004 R1100S
Old 11-29-2019, 09:09 PM
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check the temp sensor and all of the other sensor's
and the cables as bill said
check the throttles are synced
did you change the throttle bodies?
Old 11-30-2019, 08:37 AM
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I won't be able to access the bike until Tuesday (as the facility is closed for a long Thanksgiving weekend). But I will definitely take a look at the spark plug wires and the seating of the throttle body connectors. I was also looking at purchasing a Morgan Carbtune to sync the throttle bodies (but will have to wait for it to arrive). I didn't change the throttle bodies. I'll also test the temp sensor and other sensors, and look at cleaning the fuel injectors too.

Nothing like a problem to serve as an impetus to learn a lot of new things about how your motorcycle works.

Thanks, Norman

Last edited by bullwrinkle; 11-30-2019 at 04:02 PM..
Old 11-30-2019, 03:58 PM
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A complete different engine would require different throttle body settings, mounting a different engine onto your old throttle bodies would require a complete throttle sync and likely fast idle adjustment & throttle position sensor adjustment.
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Old 12-01-2019, 01:55 PM
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There are also digital manometers with a built in tachometer ( tach ).
The Harmonizer from Adventure Rider forums is no longer available.
The Digi Sync is still available for about $125.

The Digi Sync Top Page

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2004 R1100S

Last edited by Groceryrun; 12-02-2019 at 08:43 PM..
Old 12-02-2019, 09:32 AM
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there's a sheet ton of info in the searchable archive for the R1100, if it can happen, it's been covered.
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Old 12-02-2019, 02:17 PM
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https://ibmwr.org/index.php/2001/05/28/zerozero-tps-adjustment/

Mine had been played with. Adjust the valves, new plugs, then I did zero-zero.
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Old 12-02-2019, 02:57 PM
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The answer to the OP jeez it could be anything but i’d Certainly be looking at throttle cables being seated and balancing the TB’s as the quick fix.

I wonder how many on here even remove the tick over screws and clean the Scht off the end!!!
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Old 12-03-2019, 01:59 AM
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I had the same problem after replacing my engine with a used one. The fix was balancing the throttle bodies after a good valve lash adjustment and cleaning the air screws in the throttle bodies.
Old 12-03-2019, 05:32 PM
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Quote:
Originally Posted by N41EF View Post
https://ibmwr.org/index.php/2001/05/28/zerozero-tps-adjustment/

Mine had been played with. Adjust the valves, new plugs, then I did zero-zero.
Zero=Zero has been disproven, since the TPS only works properly down to 250 mV. It needs to be Zero=250mV.

Here's the BMW throttle body sync procedure with an updated zero=250mV step if you need that: https://advrider.com/f/threads/tps-alignment-idle-speed-adjustment-beyond-zero-zero.996719/page-6#post-32357006
Old 12-04-2019, 05:16 AM
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