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Old 01-12-2011, 06:38 AM   #1
hank0614 OP
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Joined: Dec 2006
Location: In the Adirondack Park, New York USA
Oddometer: 15
Cylinder Overboring - R90S Add'l Question

Thanks for all the replies. My friend has one question: where is the spigot measured to determine whether it is a small 97mm or a large 99mm spigot? Is it at the base or the largest point where it enters the engine case? As the bike was built in 10/75 he may be at the point of change over where BMW was using up what small spigot cylinders were left in inventory.

Thanks again!

Hank
'72 R60
'95 K75S



hank0614
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Old 01-12-2011, 08:47 AM   #2
wirewrkr
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As I mentioned before, if it is a 10/75 production, it should be the large spigot.
I also mentioned that the diameter of the pushrod tubes is also a determining factor.
The 18 mm diameter is for the large spigot, the 16 is for the small spigot.
Pretty easy to tell.
16mm is close to 5/8"
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