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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
How Much Compression Reading Should A Twin Have & Leak Down
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<blockquote data-quote="CarlHungness" data-source="post: 173929" data-attributes="member: 2517"><p>After all of the aggravation I've caused to the membership regarding my starting problems I still think</p><p>the hiccup is my own installation of the ATD on my Lucas mag. It's been 20 odd years since I installed the Lucas</p><p>and did so 2-3 time years back thebn, and each time it fired. Recently, the first time I put it in, the bike ran momentarily and died, as reported, then did so again after fiddling what who knows what. I failed to check the timing after the bike fired and ran a couple of times, my mistake. Since I have such a devil of a time getting it set and starting the bolt, I resorted to taking the timing cover off each time and was as sure as I could be it was installed properly and in time.</p><p> However, the last two times, once this morning, I've checked the timing before removal for certain it has been out of time, telling me the ATD is slipping on the magneto shaft. I lapped the ATD to the shaft, twice, and if it could be over-done then there's another problem. I used valve grinding compound and turned the ATD on the shaft vigorously both directions. I took out the mag, put it in the vise with soft jaws, put the ATD on, and set it with a socket, and could see it moved into position, moving back a full quarter inch or so. My problem when putting it on the bike is when I set it, the ears on the ATD are stuck in the full advance position. So I flattened the horseshoe washer with a brass hammer on one of my railroad rails that's flat. Then I flattened the washer further by rubbing on my diamond stone. I can barely get the horseshoe washer behind the bolt to install the plot, so on a couple of occasions I've started the bolt far enough to j-u-s-t get the unit on the mag, then backed the bolt off, put the washer in and finger tightened. Then I've set the unit with a socket..gently. Evidently too gently if it is slipping. Then I've set it firmly, and fiddle-fiddle with the bolt-the unit itself, trying to get a balance where the bolt is just about tight, and the ears will pop open. I can't locate the problem with the ears sticking and once again at wit's end. I don't recall taking the timing cover off years ago to re-install the mag but now it's a must. I just can't get the bolt started, even with pulling the ATD back far as I can, I'm catching the left-hand threads. Of course I'm using a dowel to keep the ears open, and took a tip of master mechanic Glen Bewley to use needle nose vise grips. So, I can get it set, but can't keep the ears from binding..and when I get them freed up the unit must not be all the way on, or else it wouldn't slip. I should have surmised the problem as I did get the bike fired, and wouldn't have had the aggravation of digging through the carb float bowls.</p><p>I've had the exhausts, timing, etc all off about 5-6 times minimum here in the past two weeks and not sure how I am ever going to get the ATD seated once and for all. I sure miss the B-TH and the simple rod used to get it in time.</p><p> There just has to be a 'binding' problem from the ATD to the shaft. </p><p> Didn't I used to see new or rebuilt ATD's in MPH? I want to fix the problem but have run out of talent.</p></blockquote><p></p>
[QUOTE="CarlHungness, post: 173929, member: 2517"] After all of the aggravation I've caused to the membership regarding my starting problems I still think the hiccup is my own installation of the ATD on my Lucas mag. It's been 20 odd years since I installed the Lucas and did so 2-3 time years back thebn, and each time it fired. Recently, the first time I put it in, the bike ran momentarily and died, as reported, then did so again after fiddling what who knows what. I failed to check the timing after the bike fired and ran a couple of times, my mistake. Since I have such a devil of a time getting it set and starting the bolt, I resorted to taking the timing cover off each time and was as sure as I could be it was installed properly and in time. However, the last two times, once this morning, I've checked the timing before removal for certain it has been out of time, telling me the ATD is slipping on the magneto shaft. I lapped the ATD to the shaft, twice, and if it could be over-done then there's another problem. I used valve grinding compound and turned the ATD on the shaft vigorously both directions. I took out the mag, put it in the vise with soft jaws, put the ATD on, and set it with a socket, and could see it moved into position, moving back a full quarter inch or so. My problem when putting it on the bike is when I set it, the ears on the ATD are stuck in the full advance position. So I flattened the horseshoe washer with a brass hammer on one of my railroad rails that's flat. Then I flattened the washer further by rubbing on my diamond stone. I can barely get the horseshoe washer behind the bolt to install the plot, so on a couple of occasions I've started the bolt far enough to j-u-s-t get the unit on the mag, then backed the bolt off, put the washer in and finger tightened. Then I've set the unit with a socket..gently. Evidently too gently if it is slipping. Then I've set it firmly, and fiddle-fiddle with the bolt-the unit itself, trying to get a balance where the bolt is just about tight, and the ears will pop open. I can't locate the problem with the ears sticking and once again at wit's end. I don't recall taking the timing cover off years ago to re-install the mag but now it's a must. I just can't get the bolt started, even with pulling the ATD back far as I can, I'm catching the left-hand threads. Of course I'm using a dowel to keep the ears open, and took a tip of master mechanic Glen Bewley to use needle nose vise grips. So, I can get it set, but can't keep the ears from binding..and when I get them freed up the unit must not be all the way on, or else it wouldn't slip. I should have surmised the problem as I did get the bike fired, and wouldn't have had the aggravation of digging through the carb float bowls. I've had the exhausts, timing, etc all off about 5-6 times minimum here in the past two weeks and not sure how I am ever going to get the ATD seated once and for all. I sure miss the B-TH and the simple rod used to get it in time. There just has to be a 'binding' problem from the ATD to the shaft. Didn't I used to see new or rebuilt ATD's in MPH? I want to fix the problem but have run out of talent. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
How Much Compression Reading Should A Twin Have & Leak Down
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