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I am currently prepping my '07 LT for the trek to CCR and have encountered somewhat of a dilemma when buttoning up the engine after the valve check… I found a 5/8" radius by 1/2" tall rubber piece on the floor near where I was working to reinstall the cylinder head cover. I watched the Illinois videos on valve checking and also looked in my Clymer Manual (see attached page and pictures of Page 83 and the rubber piece). Figure 13 and Instruction 8 tells you to note the position of the grounding spring installed on the intake camshaft's No. 1 bearing cap. I don't recall ever seeing any grounding spring and the rubber piece I'm trying to identify doesn't fit the description of a "grounding spring". Anybody know what the rubber piece is, and what is the purpose of a grounding spring (I would assume that it should somehow electrically ground the cover to the engine, perhaps for radio noise/interference?). I also looked all around the bike to see if any spring had fallen out when I took the cover off yesterday. Any help would be appreciated! :confused:
 

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I haven't seen that bit before so cant help, the grounding spring is just that a spring, and it fits on the cam tower same as clymer, did you buy the bike new as it may have been left off by Previous owner. I am thinking it may be out of the spark plug connector
 

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I am currently prepping my '07 LT for the trek to CCR and have encountered somewhat of a dilemma when buttoning up the engine after the valve check… I found a 5/8" radius by 1/2" tall rubber piece on the floor near where I was working to reinstall the cylinder head cover. I watched the Illinois videos on valve checking and also looked in my Clymer Manual (see attached page and pictures of Page 83 and the rubber piece). Figure 13 and Instruction 8 tells you to note the position of the grounding spring installed on the intake camshaft's No. 1 bearing cap. I don't recall ever seeing any grounding spring and the rubber piece I'm trying to identify doesn't fit the description of a "grounding spring". Anybody know what the rubber piece is, and what is the purpose of a grounding spring (I would assume that it should somehow electrically ground the cover to the engine, perhaps for radio noise/interference?). I also looked all around the bike to see if any spring had fallen out when I took the cover off yesterday. Any help would be appreciated! :confused:

There is nothing in the valve cover area that looks like that part. Maybe in the fairing area, but not 100% sure about this.

My best guess:
you have removed the spark-plug - correct?
This type of rubber piece is often found at bottom of spark-plug long socket to stabilize (and hold) tip of plug. I have lost one of these on garage floor once because it had unglued itself from socket.
 

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Discussion Starter #5
Thanks for the responses! I came up dry on the idea that the rubber piece was from one of the spark plug wires - all four plug wires looked the same - even though I had hoped this was the answer. At least it satisfied my concern about needing to take the valve cover off again. Oh well, I'm know thinking that the thing must have fallen off during tupperware removal. :wave
 

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Discussion Starter #7
Look inside the spark plug SOCKET TOOL.
Excellant suggestion, but I used an 11/16" regular deep socket on the plugs, as my 13/16" and 5/8" spark plug sockets don't work on the LT plugs. Although the rubber piece very tightly fits in the 5/8" socket, the LT's porcelain plug insulator flops around in the rubber piece, so there's no way it could have come from any of my socket tools. But thanks again for the suggestion. :bmw:
 

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I had the same thing happen to me. I can not remember so well since it was two years ago but I am 99% certain it is a spacer for the fuel tank and frame.
 
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