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#977868 - 01/09/17 01:47 PM Re: Winter time maintenance list... [Re: Marlen Padberg]
dirtrider Offline
The Oracle
Member

Registered: 06/05/10
Posts: 12317
Loc: Ohio
Afternoon Marlen

I looked in my hexhead & camhead BMW dealer shop manuals & there is nothing listed for either lateral or radial run out so BMW pass/fail specs are undetermined.

On most modern alloy rim motorcycle wheels the general accepted spec is: maximum axial and radial runout of 2.0 mm (0.080").

My personal spec is a little tighter & I generally use: maximum (desired) axial and radial runout of around .75mm (0.030") or less but I won't quibble with 1mm (0.039").

Added: I did find the BMW 1150RT wheel runout specs in my BMW 1150 manual as follows---

Max. radial runout/lateral runout
Front wheel .............................. 0.5 mm (0.0197")
Rear wheel ................................ 0.3 mm (0.0118")


Edited by dirtrider (01/09/17 01:51 PM)
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#977944 - 01/10/17 01:33 PM Re: Winter time maintenance list... [Re: Marlen Padberg]
freetime2247 Offline
Newer Member

Registered: 05/26/16
Posts: 29
Loc: Louisiana
What is the semishpere?

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#977948 - 01/10/17 02:28 PM Re: Winter time maintenance list... [Re: freetime2247]
dirtrider Offline
The Oracle
Member

Registered: 06/05/10
Posts: 12317
Loc: Ohio
Originally Posted By: freetime2247
What is the semishpere?


Afternoon freetime2247


The SemiSphere is a little domed cap that goes between the end of the valve stem & the rocker arm to allow the rocker arm to articulate & move the valve up & down.

The thickness of the SemiSphere controls the valve lash. There is a SemiSphere on each valve.

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#977949 - 01/10/17 02:41 PM Re: Winter time maintenance list... [Re: Marlen Padberg]
freetime2247 Offline
Newer Member

Registered: 05/26/16
Posts: 29
Loc: Louisiana
Wonder how that fell out while performing the valve check?

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#977950 - 01/10/17 02:50 PM Re: Winter time maintenance list... [Re: freetime2247]
dirtrider Offline
The Oracle
Member

Registered: 06/05/10
Posts: 12317
Loc: Ohio
Originally Posted By: freetime2247
Wonder how that fell out while performing the valve check?


Afternoon freetime2247

I don't think it fell out DURING the valve check, I would imagine it fell out after the valve check when the engine was started.

I think the clip holding the rocker arm on came off, then the rocker arm slid out & allowed the SemiSphere to fall out.
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#982072 - 03/13/17 07:47 PM Re: Winter time maintenance list... [Re: dirtrider]
Marlen Padberg Offline
Newer Member

Registered: 07/02/15
Posts: 28
Thats exactly what happened. I did some digging, found the semisphere (it didn't drop down into the engine), carefully inspected everything, put it back together, measured valve lash (its within spec), and put everything back. Its all good now. I've had it running, and commuted to work on it a couple times, so crisis has been averted.

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#982130 - 03/14/17 03:00 PM Re: Winter time maintenance list... [Re: Marlen Padberg]
Green RT Offline
Member

Registered: 11/23/03
Posts: 1513
Loc: Guadalajara, México
Originally Posted By: Marlen Padberg
Thats exactly what happened. I did some digging, found the semisphere (it didn't drop down into the engine), carefully inspected everything, put it back together, measured valve lash (its within spec), and put everything back. Its all good now. I've had it running, and commuted to work on it a couple times, so crisis has been averted.


Congratulations. I have been there, lose a small part somewhere, then worry about 1) how to replace it, and 2) where is it now and what is it going to do. I dropped a screw in the fan housing on a Volkswagon Beetle once and had to listen to it rattle around for a few weeks until, IIRC, it finally beat itself to death.
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Will

2015 R1200R Cordoba Blue (current)
1999 R1100RT Tundra Green
1987 R100RT Grey
1970 R60/5 Black w/white pin stripes
196? Honda 305 Super Hawk
195? Sears Allstate 50 cc Moped

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#982148 - 03/14/17 04:47 PM Re: Winter time maintenance list... [Re: Marlen Padberg]
Don_Eilenberger Offline
Member

Registered: 08/07/06
Posts: 1262
Loc: Spring Lk, NJ, USA
Originally Posted By: Marlen Padberg
Thats exactly what happened. I did some digging, found the semisphere (it didn't drop down into the engine), carefully inspected everything, put it back together, measured valve lash (its within spec), and put everything back. Its all good now. I've had it running, and commuted to work on it a couple times, so crisis has been averted.
The manual does call for replacing the clips whenever they are removed.. one time use. Might be the reason yours came off if you reused it.
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Don Eilenberger
'12 R1200R - Love this bike!
Spring Lake, NJ

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