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Old 05-03-2013, 09:29 AM   #1
band-aid OP
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Diameter of posts on advance unit?

Anyone happen to know the diameter of the posts on the advance unit for a 74 BMW R60? I don't know if that part varied across models but I'm trying to source some brass bushings to limit max advance as a pinging solution.

Odd thing to know off hand but perhaps some Airnerd out there made a note... If not, I'll get in there and figure it out when I get home.

Someone had mentioned that working a long time ago in some series of posts and while playing with it last night I FINALLY understood how that works.
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Old 05-03-2013, 09:41 AM   #2
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I think Ted's have them. I think welding them and then grinding the stops to taste works better.
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Old 05-03-2013, 04:39 PM   #3
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Originally Posted by supershaft View Post
I think Ted's have them. I think welding them and then grinding the stops to taste works better.
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Old 05-04-2013, 10:31 AM   #4
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Thanks, I don't see them in the online store but I'll give a ring during business hours to see if they have em. Could save me the trouble of determining the ideal OD size.

As far as welding the posts go- I think I'd like to try a limiter that is reversible before committing to the idea.
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Old 05-04-2013, 10:53 AM   #5
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These posts?

All 4 posts measure 0.109" diameter. The spring groove measures 0.078" diameter.



This is from a 1974 R90.. but is a common part across a bunch of models.
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Old 05-04-2013, 11:17 AM   #6
supershaft
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Originally Posted by band-aid View Post
Thanks, I don't see them in the online store but I'll give a ring during business hours to see if they have em. Could save me the trouble of determining the ideal OD size.

As far as welding the posts go- I think I'd like to try a limiter that is reversible before committing to the idea.
You weld the 'slot', not the post. The mod is completely reversible. You just grind the weld back to stock. Brass, bronze, and brazing doesn't hold up well there.
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Old 05-06-2013, 05:42 PM   #7
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Originally Posted by crazydrummerdude View Post
These posts?

All 4 posts measure 0.109" diameter. The spring groove measures 0.078" diameter.



This is from a 1974 R90.. but is a common part across a bunch of models.

Thanks! Mine is on the bike and a little harder to access so this is pretty helpful. I have been searching for these collars so I can limit my advance and it looks like I'm going to have to DIY it so these measurements were crucial. Appreciated!
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Old 05-07-2013, 03:32 AM   #8
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Originally Posted by crazydrummerdude View Post
These posts?

All 4 posts measure 0.109" diameter. The spring groove measures 0.078" diameter.



This is from a 1974 R90.. but is a common part across a bunch of models.
Those look like the pivot posts. Cannot be changed, nor do you want to. To limit max anvance, you shim (or just bend) the stop tabs. Flip it over and find the tab the weight stops against at max advance.

To stretch the curve you either lighten the weights or fit the stiffer springs.

I put adjustable stops in my advance assembly so I can limit the max advance to whatever I please by turning a screw.:






Different model, same idea.
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Old 05-07-2013, 10:14 AM   #9
supershaft
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That advance does not have stop tabs.

What is keeping your adjuster screws from coming loose?
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