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Old 08-10-2014, 06:37 AM   #1
disston OP
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Ghost Timing Image

I fixed the ghost timing image several years ago on my 1975 R90/6. It seems to be back, not as bad as years ago and maybe not even too bad but the marks are 4 or 6 mms apart now.



I get a runout of .003" or less. I don't think this is much and think I will try another advance unit instead of trying to straighten the quill on the cam.

I'm really suspecting the timing chain gear on the camshaft but don't think I will have time to replace that anytime soon.
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Old 08-10-2014, 06:59 AM   #2
00_Green
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I'm very interested in what your fix is, I have the ghost image on my R100. My first thought is to check the run out on the cam nose but I don't have a suitable dial and clamp.

If anyone can suggest a reasonably priced dial and clamp kit please pass the info along.
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Old 08-10-2014, 07:31 AM   #3
PaulRS
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0,003" equals 0.076 mm, where 0.02 mm is max, acc my books.

So some corrective action is required here.

Paul.
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Old 08-10-2014, 07:57 AM   #4
crazydrummerdude
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Quote:
Originally Posted by 00_Green View Post
If anyone can suggest a reasonably priced dial and clamp kit please pass the info along.
Search craigslist for machinist tools. You'll often got a whole bunch of good quality machinist tools for cheap. I've gotten tool-boxes-full for the cost of one of the individual tools new.
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Old 08-10-2014, 09:17 AM   #5
190e
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I'd do a static timing check to more accurately measure the number of degrees difference between cylinders. If its more than 2 or 3 deg then 0.003" run out is too much. I suspect it will be.
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Old 08-10-2014, 09:19 AM   #6
disston OP
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I bought that Starrett tool on Ebay a couple of years ago. I paid about $25 for it. It has been a good tool but I don't get a lot of use out of it. I have another type that isn't as good.



I had a NOS advance unit. A late model 012. This has closed the Ghosting down a lot. The double images are touching. So I think when I work on straightening the quill I will get the rest of it out. No time today I'll post back here when I finish.

With the new advance unit the bike is running much better. I now have the best idle I've ever had with this bike
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Old 08-10-2014, 01:29 PM   #7
disston OP
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I tried to take a pic of the timing light flashing on the S mark at idle.

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