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Old 04-18-2013, 04:05 PM   #1
Big Bamboo OP
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Late model airbox "snorkel" removal

I'm talking about the rubber elbows inside the late style airbox on a 1992 GS. Is there a trick to getting them out? I assume the are removed towards the inside of the 'box. I tried a couple test whacks with a 2x4 and a hammer, but they didn't budge. Time for a bigger hammer?
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Old 04-18-2013, 04:11 PM   #2
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You pull the metal sleeves out from the airbox (towards the carbs), the rubber airhorns are held in my that sleeve, and a lip on the their end.
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Old 04-18-2013, 04:30 PM   #3
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Originally Posted by SOLO LOBO View Post
You pull the metal sleeves out from the airbox (towards the carbs), the rubber airhorns are held in my that sleeve, and a lip on the their end.
Yeah, pull those sleeves out Tim. They may be held in with a smear of silicone too.
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Old 04-18-2013, 04:43 PM   #4
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Those are velocity stacks man! I think a stock engine and even a slightly modified setup runs better with them just like they come out of the box. My setup now runs better with the stock stacks shortened to just inside the box but my engine is far from stock now.
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Old 04-18-2013, 05:32 PM   #5
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Originally Posted by supershaft View Post
Those are velocity stacks man! I think a stock engine and even a slightly modified setup runs better with them just like they come out of the box. My setup now runs better with the stock stacks shortened to just inside the box but my engine is far from stock now.
Thanks for the replies! I'm not removing them for the sake of performance. I need to get them out of the way in order to remove the airbox from the bike. The top two bolts are giving me a hard time, and there's no room for anything but an allen wrench in there...
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Old 04-18-2013, 07:51 PM   #6
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Old 04-18-2013, 08:46 PM   #7
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Originally Posted by supershaft View Post

Velocity stacks are plastic, not rubber.
And they are on the outside of the airbox, not the inside.
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Old 04-18-2013, 09:08 PM   #8
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Velocity stacks are plastic, not rubber.
And they are on the outside of the airbox, not the inside.
Wouldn't "plenum" be a better term?
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Old 04-18-2013, 09:12 PM   #9
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Wouldn't "plenum" be a better term?
No. That's something else entirely. Stacks can be made out of whatever. Rubber, plastic, aluminum, steel, brass, what have you. They can be inside of an airbox as well. They are what they are and work like they work in a box or not.
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Old 04-18-2013, 09:56 PM   #10
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Originally Posted by ME 109 View Post
Velocity stacks are plastic, not rubber.
And they are on the outside of the airbox, not the inside.
Not quite. "Velocity stacks" is a catchy term some hot rodder came up with eons ago. The correct term, whether we're talking aero or fluid dynamics is "bell mouth". And they can be made out of anything, as long as the shape is maintained for the intended purpose. If you have bellmouths feeding your throttle bodies, sticking out of the hood of your race car, you want them made out of something substantial so they dont distort or collapse under air loads when at speed. But inside an airbox, rubber is just fine.
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Old 04-18-2013, 09:58 PM   #11
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Originally Posted by supershaft View Post
Stacks can be made out of whatever.
Doh! You're right.

Tim wasn't asking about his velocity stacks tho'

Did you get the "rubber elbows" out Tim?

Oops! well of course the elbows are part of the stack as well, but let's not get sidetracked by technicalities!
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Old 04-18-2013, 10:54 PM   #12
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Originally Posted by Big Bamboo View Post
Thanks for the replies! I'm not removing them for the sake of performance. I need to get them out of the way in order to remove the airbox from the bike. The top two bolts are giving me a hard time, and there's no room for anything but an allen wrench in there...
So use an allen wrench?
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Old 04-21-2013, 09:30 AM   #13
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Originally Posted by Big Bamboo View Post
Thanks for the replies! I'm not removing them for the sake of performance. I need to get them out of the way in order to remove the airbox from the bike. The top two bolts are giving me a hard time, and there's no room for anything but an allen wrench in there...
Those are a bear to get out, I feel yer pain. what you will find is that the fix for this is to swap the hex head bolts on the starter with the socket head bolts (allen) in the airbox when you reassemble, makes both items easier in the future. Why BMW didn't do this in the first place is a mystery to all
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Old 04-21-2013, 11:55 AM   #14
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Those are a bear to get out, I feel yer pain. what you will find is that the fix for this is to swap the hex head bolts on the starter with the socket head bolts (allen) in the airbox when you reassemble, makes both items easier in the future. Why BMW didn't do this in the first place is a mystery to all
I looked at mine because I have to take it out shortly. I put slotted heads in there (and then forgot). Same as a allen head...hold the inside and take off the nut on the other side.
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Old 04-21-2013, 12:55 PM   #15
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I don't understand how they are a bear to get out? That whole setup is a breeze IMO.
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