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Service-InformationM otorcycle
โข Group: 11
BMW ofยท NA. . .. ‘Engineยท. . _
Service Department.’ ; . ,. . . : . . . . .;
May 1986
ยท11: 032 86
.. โข. (2208)
For USA Only
. _.. -..~. -;ยท ~ โข;: , …,. ;.ยท ;:~.~~. “: j
-ยท. ยท,._ ‘ ‘ “‘ 1
Installation of 1985-Model R80 Rocker Arm Assemblies
on Older Boxers
Change:
Features:
~—..a
Starting with the 1985 model, all Boxer engines
have modiยฃ ied rocker arms as a means of reducing
noise and ensuring accurate adjustment of rocker
arm endplay.
This modification can be done on all Boxer engines
from model year 1976 to the present.
11 33 l 337 720 = 0.2 mm
719 = 0.25 mm
718 = 0.3 mm
21 = 0.35 mm
33 1 337 713 = rocker intake
33 1 337 715 = rocker exhaust
11 12 1 337 867 = rocker mount
11 12 l 337 868 = washer
The new rocker arm pivots reduce mechanical noise.
Rocker arm endplay is adjusted to 0.05 + 0.02
mm by shim washers.
In addition, a pressed-in
a damping effect on the noise
arm striking the pivot mount.
plastic inser;_ has
caused by th~ rocker
As shown in the drawing, silicon rubber inserts
prevent the cooling fins from vibrating and causing
noise.
No+-.e:
11 12 1 337 818
You can order the necessary parts through normal
parts channels.
A complete conversion kit can be ordered from
our Parts Department under Part No. 11 33 9 057
699.
Pre-1985 model heads will need support bushings,
Part No. 11 12 1 261 405, if the new rocker arm
assemblies are used.
Very truly yours,
BMW OF NORTH AMERICA, INC.
Richard Dampf~
National Technical Manager
Motorcycle Group
RD:ch/033
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About the Service Bulletin Archive
Searchable index of BMW service bulletins for repair and parts installation for a variety of 247 models. This is not an exhaustive list. If you have ones to share to help complete the archive, please contact us directly.

