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Old 04-19-2014, 06:24 PM   #1
picinisco OP
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Points assembly

Is the M6 thread on the end of the shaft that the points assembly on a left hand thread?
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Old 04-19-2014, 07:02 PM   #2
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Assuming you mean the end of the cam, no.
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Old 04-19-2014, 10:24 PM   #3
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Uh oh. What did you do?
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Old 04-19-2014, 10:58 PM   #4
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Quote:
Originally Posted by Thorazine View Post
Uh oh. What did you do?


It begins...
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Old 04-20-2014, 01:39 AM   #5
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...or just ends.



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Old 04-20-2014, 08:23 AM   #6
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Quote:
Originally Posted by SculptD View Post
It begins...
oh no. It began a year ago. This is just the continuing saga.

Quote:
Originally Posted by Thorazine View Post
Uh oh. What did you do?
I guess when i was throwing the engine about when the piston was stuck, I may have bumped the end of the cam on the floor a couple of times and now with points on and the counter weights in place, the nut doesn't want to start so i will clean up the thread with a die and call it good. At least that will be the easy answer.
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Old 04-20-2014, 09:54 AM   #7
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That advance mechanism quill is prone to bending if knocked around and can develop runout, which can cause ign timing problems. Best to check it now.

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Old 04-20-2014, 10:21 AM   #8
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That advance mechanism quill is prone to bending if knocked around and can develop runout, which can cause ign timing problems. Best to check it now.

--Bill
Can it be straightened
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Old 04-20-2014, 12:05 PM   #9
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There is a part on the Duane Ausherman's Web Pages about fixing the problem. I'll dig it up later.

The symptom you will find if you have this problem and actually look for it is there will be a ghost timing image. Two different timing events that will cause a very funny loopy running of the engine.

You need to check the timing with a standard type timing light. Aim the light at the window and raise the idle a slight amount so the S image can be seen to rise and disappear. Then the Dot mark appear. If the quill is bent there will be two S marks and two Dots.

This happens because the cam of the advance unit that opens and closes the points is opening one side sooner than the other side.

I don't think you have this engine running yet? It does have to be running to see the effect that a bent quill has on the timing using a timing light. You could measure the runout though if you have a good dial gauge set up.



This is the front of an Airhead camshaft with the quill removed. It may be bent or it may be cocked in the bore.
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Old 04-20-2014, 12:17 PM   #10
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I think this is the page on Duane Ausherman's site that deals with the double or ghost timing image problem.

http://w6rec.com/duane/bmw/timing/

You will notice the article is mostly about dealing with this problem on /2 bikes. It happens much the same way on later bikes that have ignition points.
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Old 04-20-2014, 06:33 PM   #11
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Can it be straightened
Yes.
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Old 04-20-2014, 10:36 PM   #12
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Yes.
Thanks
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