The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: jusgus on October 12, 2008, 10:39:18 AM

Title: 1980 timing advance
Post by: jusgus on October 12, 2008, 10:39:18 AM

After replacing the valves on Billie (1980 R65) and touring a little I came home and retorqued the head bolts and adjusted the valves.  While I was at it I also checked the points and timing. That was when I noticed that the timing mark advanced up to about 2200 revs then fell back and readvanced up to about 3000 rpms.  She runs good but I was wondering if there are 2 stages of advance or if there is a problem in the bean can?

Title: Re: 1980 timing advance
Post by: drewboid on October 12, 2008, 01:27:46 PM

You have a problem - the advance should move up smoothly as the weights swing out.

Title: Re: 1980 timing advance
Post by: jusgus on October 12, 2008, 03:20:01 PM

Thanks Drew!

Title: Re: 1980 timing advance
Post by: steve hawkins on October 13, 2008, 03:41:35 AM

Try a bit of cleaning/lubrication before you try to strip/replace it.  Something I managed to get away with with my 1979 R65 - especially as you just have a slightly sticky operation, rather than no operation at all.

These items are expensive to replace and difficult to strip/service - BMW specified that they are a non rebuildable item.

If you have no luck, you can always replace the ignition with a Boyer etc.  

However, I am still running my points bean can on my 1979 R65 Cafe Racer at 115,000 miles(aprox) so they can remain serviceable for quite some time.

Title: Re: 1980 timing advance
Post by: Justin B. on October 13, 2008, 09:13:30 AM

The points can is easier to get apart than the electronic one - IMO.   It is strange that it would advance, then drop.  I would have thought that it would be sluggish/jerky, or advance and then stick there.  Let us know what you determine.  This is what it looks like ('80 R65) and it was causing idle speed to be too high after a blast down the freeway:

Title: Re: 1980 timing advance
Post by: jusgus on October 15, 2008, 07:37:32 AM

Cool picture Justin, Thanks a 1000 (words). I also have noticed that she revs higher after running. I was wondering if it would come apart and now I know. Are there any obvious pittfalls or is it a pretty straight forward disassembly?  My brother has already suggested that I try some of his light weight water proof bicycle grease when I get it apart.

Title: Re: 1980 timing advance
Post by: Justin B. on October 15, 2008, 02:13:59 PM

Just take lots of pics so you can remember where everything goes!