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Old 04-04-2011, 11:10 PM   #1
lmclamore OP
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Throttle Body Adjustment?

I was recently at my dealer's service department for a valve cover gasket replacement on a 2010 F650GS. The service manager came out and said "who's been messing with your throttle body adjustment?". I asked him to show me what he was talking about and he pointed out the painted hash marks on the adjustment screws were black. He said BMW's factory marks are always blue. Not me and my independent mechanic says he never touched them doing some unrelated work this past winter. He used to work at this dealer and ended up speaking to my service manager about it calling the situation a mystery. The bike runs fine and has had a Booster Plug installed for the last 6K of 7K total miles. On approaching my bike in the sun yesterday, I notice the right header pipe is more blue than the left. I never noticed any bluing before.
1. Does anyone have black painted hash marks on their throttle body adjustment screws?
2. Does anyone have bluing discoloration on their header pipes?
3. Does anyone have a noticable difference in this bluing between the two headers?
4. Should I stop worrying about all this and enjoy a running bike?
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Old 04-05-2011, 06:56 AM   #2
JRWooden
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I may have missed it, but I can not find a procedure listed in rev #4 of the BMW manual for sync. of the throttle bodies.
The Haynes manual mentions the screws but simply says not to mess with them ...

It would certainly seem that if they were out of sync. that one cylinder would run leaner than the other. Joel did a tear-down on a twin that seemed to be running that way, but I never heard if he was able to track down the cause....
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Old 04-05-2011, 11:03 AM   #3
YetiGS
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Where are the throttle body adjustment screws? Picture?


I just want to paint mine yellow to mess with my service guy.
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Old 04-05-2011, 11:58 AM   #4
ebrabaek
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If one header prolongely has more blue`ing.....than the other......I`d say I would investigate. Mine looked the same before the addition of the skid plate.......still the same after the skid plate..... But that`s just me...

Erling
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Old 04-05-2011, 08:47 PM   #5
Bayner
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I wouldn't swear by it, but I think mine was black.
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Old 04-06-2011, 03:37 AM   #6
lmclamore OP
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Quote:
Originally Posted by YetiGS View Post
Where are the throttle body adjustment screws? Picture?


I just want to paint mine yellow to mess with my service guy.
YtiGS - They are under the airbox and not easily seen without taking battery, airbox, and plastic off.

Everyone - Thanks much for your responses. I got a confirmation on F800Riders that one rider definitely has black hash marks. That tells me that they are not "always blue".
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Old 04-06-2011, 07:38 PM   #7
JoelWisman
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Imclamore, I have seen BMW use black paint on the throttle body screws, I've seen yellow for that matter. I think they use whatever color paint they have handy. Your service manager is an astute observer, but concerned for nothing in this case.

Imclamore and Jrwooden, the cause of color differences on headers of the k7x bikes I've seen, including the one I've seen torn down was one fuel injector partially plugged. Such evidence deserves a few BMW techron treatments before it turns into a stuck injector. Neumerous other causes are possible, but plugging injectors are the common cause.

Yeti, your a bastard, but I like you :) I have on occasion tossed an extra bolt into a pile one of my techs has mid job. If they flip out trying to figure out where it goes, it relaxes and pleases me. I wouldn't suggest doing the same unless the tech is hourly and you don't mind them chucking large objects at you
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Old 04-06-2011, 07:49 PM   #8
YetiGS
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Quote:
Originally Posted by JoelWisman View Post
Yeti, your a bastard, but I like you :) I have on occasion tossed an extra bolt into a pile one of my techs has mid job. If they flip out trying to figure out where it goes, it relaxes and pleases me. I wouldn't suggest doing the same unless the tech is hourly and you don't mind them chucking large objects at you
He's a buddy of mine. Scrawny little bastard likes to run me into the ground when we go play for runs. It would be fair payback.
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Old 04-07-2011, 03:16 AM   #9
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Quote:
Originally Posted by JoelWisman View Post
Imclamore and Jrwooden, the cause of color differences on headers of the k7x bikes I've seen, including the one I've seen torn down was one fuel injector partially plugged. Such evidence deserves a few BMW techron treatments before it turns into a stuck injector. Neumerous other causes are possible, but plugging injectors are the common cause.
Joel - Thanks for the advice. I have been running BMW FI Cleaner or Seafoam every 3-4 tank fulls since the bike was new. I will step up the Techron treatment to every tank full for a while and keep an eye on the pipes. I'll be visiting George at BUA in a couple of months for something else and will ask him to take a look while I'm there.
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Old 04-07-2011, 06:49 AM   #10
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Mine have black paint. FWIW. 09' F800GS.

Both of my headers are blued. Lots of off-road slow stuff that keeps the fan on almost constantly. Good 10w40 syn oil in the bike.
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Old 04-07-2011, 04:37 PM   #11
lmclamore OP
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Originally Posted by jasonTDI View Post
Mine have black paint. FWIW. 09' F800GS.

Both of my headers are blued. Lots of off-road slow stuff that keeps the fan on almost constantly. Good 10w40 syn oil in the bike.
Thanks JasonTDI - That's encouraging. I spend a lot of time in stop/go traffic which may contribute to the bluing. I see that the significant difference between my two headers seems to be where the right one passes behind the crashbar/frame intersection which makes sense as there is less airflow in that area.
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