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How many fins on R90S cylinder?
How many fins on R90S cylinder?
On mine : 10 fins
2014 R90S by MAX BMW: 10 fins
Boxer Metal: 11 fins (https://www.flickr.com/photos/bmwmoa/se ... 008561254/)
Most photos on internet : 11 fins
Was there any modification story or technical change in the past?
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