Go Back   ADVrider > Bikes > Old's Cool
User Name
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Thread Tools Search this Thread Display Modes
Old 01-12-2011, 06:38 AM   #1
hank0614 OP
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!

'72 R60
'95 K75S

Posts: 7
Joined: Fri Aug 13, 2010 7:05 am
Hank '72 R60/5 "Schildkroete"
'95 K75S "Shall Remain Nameless"
hank0614 is offline   Reply With Quote
Old 01-12-2011, 08:47 AM   #2
the thread-killer
wirewrkr's Avatar
Joined: May 2008
Location: HIGH desert
Oddometer: 4,295
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"
wirewrkr is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Times are GMT -7.   It's 02:59 PM.

Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2015