http://autos.groups.yahoo.com/group/bmw-mono-club/ members of the bmw-mono-club are interested in the single cilinder BMW motorbike Wed, 02 Dec 2009 03:28:52 GMT richard sheckler http://autos.groups.yahoo.com/group/bmw-mono-club/message/5388 http://autos.groups.yahoo.com/group/bmw-mono-club/message/5388 Dave, A photo of the head would make it a lot easier to identify. Mark Huggett might have a list of the drawing numbers, which is the number you show in your Wed, 02 Dec 2009 03:26:58 GMT kurtsr69s http://autos.groups.yahoo.com/group/bmw-mono-club/message/5387 http://autos.groups.yahoo.com/group/bmw-mono-club/message/5387 ... It's my understanding that BMW rarely stamped part numbers onto a part. That number doesn't look anything like a typical part number anyway...most engine Wed, 02 Dec 2009 02:46:09 GMT David J http://autos.groups.yahoo.com/group/bmw-mono-club/message/5386 http://autos.groups.yahoo.com/group/bmw-mono-club/message/5386 Does anyone know if the numbers found on the base of the valve guide side of the cylinder head indicate what model single cylinder bike it comes from? I have a Wed, 02 Dec 2009 00:43:35 GMT allanatherton http://autos.groups.yahoo.com/group/bmw-mono-club/message/5385 http://autos.groups.yahoo.com/group/bmw-mono-club/message/5385 ... When I first got my R100/7 in 1988 and R69US in 2000, they were very "used". I changed their fork oil and similar nasty murky stuff came out. The internal Tue, 01 Dec 2009 18:33:08 GMT Ben http://autos.groups.yahoo.com/group/bmw-mono-club/message/5384 http://autos.groups.yahoo.com/group/bmw-mono-club/message/5384 I use a straight weight 20SAE fork oil, which is called a heavy oil on the bottle. Maybe on modern bikes that is considered heavy. But i don't bother changing Tue, 01 Dec 2009 17:37:14 GMT Kevin http://autos.groups.yahoo.com/group/bmw-mono-club/message/5383 http://autos.groups.yahoo.com/group/bmw-mono-club/message/5383 Thanks, I guess I need that owners manual after all. LOL Tue, 01 Dec 2009 09:15:02 GMT jdchambaz http://autos.groups.yahoo.com/group/bmw-mono-club/message/5382 http://autos.groups.yahoo.com/group/bmw-mono-club/message/5382 I suggest your oil grade could have been increased with mud :-) hence the stuff you found Having the impression that my recently acquired 25/3 had a hard Tue, 01 Dec 2009 08:40:52 GMT William Smithson http://autos.groups.yahoo.com/group/bmw-mono-club/message/5381 http://autos.groups.yahoo.com/group/bmw-mono-club/message/5381 According to my spec sheet the oil is SAE 20 Summer/SAE 10 in Winter with 130cc in each leg. Tue, 01 Dec 2009 06:15:48 GMT Kevin http://autos.groups.yahoo.com/group/bmw-mono-club/message/5380 http://autos.groups.yahoo.com/group/bmw-mono-club/message/5380 When I pulled the front end off some nasty, murky stuff ran out. It seemed like a rather heavy grade of oil, what is the proper fork oil in a 25/3? thanks Sun, 22 Nov 2009 18:37:08 GMT kgriff51 http://autos.groups.yahoo.com/group/bmw-mono-club/message/5379 http://autos.groups.yahoo.com/group/bmw-mono-club/message/5379 Scott, Judging by the blue Dykem on the cylinder skirt, it probably means low mileage. Once you contact BMW MT, that will shed very much light for me to help Sun, 22 Nov 2009 02:33:35 GMT unclviny16 http://autos.groups.yahoo.com/group/bmw-mono-club/message/5378 http://autos.groups.yahoo.com/group/bmw-mono-club/message/5378 Fellow R2 owners (mine is a 1936 series 5), send me an email (unclviny-at-hotmail-dot-com) so I can send you a form to fill out. All people who respond will Sun, 22 Nov 2009 02:15:52 GMT Titus http://autos.groups.yahoo.com/group/bmw-mono-club/message/5377 http://autos.groups.yahoo.com/group/bmw-mono-club/message/5377 Gents, I have got a military Green (German Border Patrol) R-27 and I had hard time matching the paint. I have not painted my bike but wanted to have some Sat, 21 Nov 2009 18:54:08 GMT T2 http://autos.groups.yahoo.com/group/bmw-mono-club/message/5376 http://autos.groups.yahoo.com/group/bmw-mono-club/message/5376 Thanks for the link to that article, Kurt. Very helpful. My speedometer shows 1,6 on the face and W1.74 on the casing. These two numbers seem not to correlate, Sat, 21 Nov 2009 17:18:11 GMT kurtsr69s http://autos.groups.yahoo.com/group/bmw-mono-club/message/5375 http://autos.groups.yahoo.com/group/bmw-mono-club/message/5375 Scott - Check out http://www.bmwvmca.org/ and the Newsletters. Find Vol 2 Number 3 and open up the article "Wegdrehzahl". Information was compiled by the Sat, 21 Nov 2009 16:08:10 GMT T2 http://autos.groups.yahoo.com/group/bmw-mono-club/message/5374 http://autos.groups.yahoo.com/group/bmw-mono-club/message/5374 "'62" R27. Final Drive: 25/6 W 1.74 (Wegdreh Zahl?) Speedo face (mph): 1,6 The yahoogroups search function isn't letting me read posts older than what shows on