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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Still Can't Start My Twin, Replaced Mag, But Not A Pop
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<blockquote data-quote="CarlHungness" data-source="post: 174144" data-attributes="member: 2517"><p>Throughout my ownership the bike has started and often, because of my inept procedure, it has taken</p><p>multiple kicks, but never refused to start until my problems began. After replacing the B-TH coils it did </p><p>start and run rough, then fired and ran fine for 60 seconds with the Lucas, then nothing...and my journey</p><p>began. Each time, now, when it has refused to start, I've put in new plugs, 10-12 in all. The best I can think</p><p>of now is a camshaft has slipped on its moorings, if possible, and as stated if I take off the timing chest</p><p>and remove a cam, which I've done previously, have had every gear out of it in the past, I just don't know</p><p>what and how to measure timing and if or if not a cam has created the problem. The mixture should be the</p><p>same, I have replaced the old jets with new ones of the same size. What has me flummoxed is the one time</p><p>lately it started and sounded normal for a minute with the Lucas AND the old ATD so my installation procedure</p><p>had to be correct. When turning the plot over with the rear wheel in 4th gear, plugs out, it sure seems as though</p><p>the valves are in sync as they have been in the past. I'm tempted to re-time the thing at 8 degrees with the</p><p>ATD ears closed, but it seems that plus or minus on the degrees would have at least given me a POP which</p><p>I'm not getting. I've even wondered if the de-comp is allowing valves to stay open thereby not creating enough</p><p>compression. I 'backed off' the decomp a few turns. But now, I'm able to locate the 'short' stroke, and I nudge it</p><p>over TDC and sure seem to get a full swing in, without using the decomp and I'm not losing any compression. If and when I try to use the decomp, letting it go 3/4 of the way down, I must be late in doing so because it is not getting a full revolution in, and I can feel the plot swinging back at me a half turn or so. I've tried kicking it all the way to the bottom, THEN letting the decomp off, and THAT allows the engine to spin fully and I'm saying to myself, "That kick was surely enough to start the engine." I feel the same way when I don't use the decomp, and just find the right spot</p><p>to kick it through, so my combination isn't right yet. Hopefully I'll locate an aberration on a cam.</p></blockquote><p></p>
[QUOTE="CarlHungness, post: 174144, member: 2517"] Throughout my ownership the bike has started and often, because of my inept procedure, it has taken multiple kicks, but never refused to start until my problems began. After replacing the B-TH coils it did start and run rough, then fired and ran fine for 60 seconds with the Lucas, then nothing...and my journey began. Each time, now, when it has refused to start, I've put in new plugs, 10-12 in all. The best I can think of now is a camshaft has slipped on its moorings, if possible, and as stated if I take off the timing chest and remove a cam, which I've done previously, have had every gear out of it in the past, I just don't know what and how to measure timing and if or if not a cam has created the problem. The mixture should be the same, I have replaced the old jets with new ones of the same size. What has me flummoxed is the one time lately it started and sounded normal for a minute with the Lucas AND the old ATD so my installation procedure had to be correct. When turning the plot over with the rear wheel in 4th gear, plugs out, it sure seems as though the valves are in sync as they have been in the past. I'm tempted to re-time the thing at 8 degrees with the ATD ears closed, but it seems that plus or minus on the degrees would have at least given me a POP which I'm not getting. I've even wondered if the de-comp is allowing valves to stay open thereby not creating enough compression. I 'backed off' the decomp a few turns. But now, I'm able to locate the 'short' stroke, and I nudge it over TDC and sure seem to get a full swing in, without using the decomp and I'm not losing any compression. If and when I try to use the decomp, letting it go 3/4 of the way down, I must be late in doing so because it is not getting a full revolution in, and I can feel the plot swinging back at me a half turn or so. I've tried kicking it all the way to the bottom, THEN letting the decomp off, and THAT allows the engine to spin fully and I'm saying to myself, "That kick was surely enough to start the engine." I feel the same way when I don't use the decomp, and just find the right spot to kick it through, so my combination isn't right yet. Hopefully I'll locate an aberration on a cam. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Still Can't Start My Twin, Replaced Mag, But Not A Pop
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