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General Minitrail Talk
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1974 CT70 Cam Timing and Ignition
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<blockquote data-quote="nanaimogreg" data-source="post: 100333" data-attributes="member: 7720"><p>Ive been working on trying to get my 74 CT going for a while and am working my way through what could be preventing it from starting. I am troubleshooting the carb and appreciate the advice members have provided (Also see my other Thread regarding Carb Troubleshooting). </p><p></p><p>I thought I would start a separate thread regarding how to properly set the cam timing and general ignition system because it doesnt fit with my other thread.</p><p></p><p>So I rechecked my recently installed points tonight to ensure they were set correctly. When checking your points how exact do you want them. Should they just barely start opening at the F mark? I'm confused because you need to set both the gap and when the points open at the same time. Can I assume that with new points if they open at the correct time (at the F mark) that the gap will be correct? What procedure works best for you?</p><p></p><p>I also rechecked my valve clearances and set them according to the manual.</p><p></p><p>When I removed the cam sprocket cover to check if it was in time and had not skipped a tooth this is what I saw with the engine at TDC on the compression stroke</p><p></p><p></p><p></p><p>. [ATTACH]14853[/ATTACH][ATTACH]14854[/ATTACH][ATTACH]14855[/ATTACH][ATTACH]14856[/ATTACH]</p><p></p><p>As you can see the 'O' is not perfectly lined up but its close. Also the chain seemed a bit loose and made a bit of a funny clicking sound as I slowly turned the flywheel and it looked like it was tightening and loosening. It looked like this:</p><p>[video=youtube_share;sfplw-1wWTs]http://youtu.be/sfplw-1wWTs[/video]</p><p></p><p></p><p>I tried to better align the 'O' with the notch and this is what it ended up like:</p><p></p><p>[ATTACH]14857[/ATTACH][ATTACH]14858[/ATTACH]</p><p>I inched the sprocket down a tooth on the chain while keeping the flywheel on the 'T'. The bolt holes in the cam side had to be lined up with the sprocket meaning I had to turn them to line them up . Not knowing much about engines would this cause any problems? The 'O' still doesnt line up perfect but its close. Seems like its about half a tooth on the opposite side of the notch than it was when I started. Is this better or worse?</p><p></p><p>I reassembled everything and tried to start the bike. As stated in my previous post I havent had much luck starting the bike and pending carb issues that I am still working on (waiting for parts) as expected the bike still did not start. This time however, I got a loud pop/backfire coming out of the muffler that did not happen before and the spark plug </p><p>which is brand new looked black.</p><p></p><p>[ATTACH]14859[/ATTACH]</p><p> </p><p></p><p><strong>My question is: </strong>Based on what I have shown and described does it look like the timing should be ok? Also what could the backfire and black spark plug be from?</p></blockquote><p></p>
[QUOTE="nanaimogreg, post: 100333, member: 7720"] Ive been working on trying to get my 74 CT going for a while and am working my way through what could be preventing it from starting. I am troubleshooting the carb and appreciate the advice members have provided (Also see my other Thread regarding Carb Troubleshooting). I thought I would start a separate thread regarding how to properly set the cam timing and general ignition system because it doesnt fit with my other thread. So I rechecked my recently installed points tonight to ensure they were set correctly. When checking your points how exact do you want them. Should they just barely start opening at the F mark? I'm confused because you need to set both the gap and when the points open at the same time. Can I assume that with new points if they open at the correct time (at the F mark) that the gap will be correct? What procedure works best for you? I also rechecked my valve clearances and set them according to the manual. When I removed the cam sprocket cover to check if it was in time and had not skipped a tooth this is what I saw with the engine at TDC on the compression stroke . [ATTACH]14853.vB[/ATTACH][ATTACH]14854.vB[/ATTACH][ATTACH]14855.vB[/ATTACH][ATTACH]14856.vB[/ATTACH] As you can see the 'O' is not perfectly lined up but its close. Also the chain seemed a bit loose and made a bit of a funny clicking sound as I slowly turned the flywheel and it looked like it was tightening and loosening. It looked like this: [video=youtube_share;sfplw-1wWTs]http://youtu.be/sfplw-1wWTs[/video] I tried to better align the 'O' with the notch and this is what it ended up like: [ATTACH]14857.vB[/ATTACH][ATTACH]14858.vB[/ATTACH] I inched the sprocket down a tooth on the chain while keeping the flywheel on the 'T'. The bolt holes in the cam side had to be lined up with the sprocket meaning I had to turn them to line them up . Not knowing much about engines would this cause any problems? The 'O' still doesnt line up perfect but its close. Seems like its about half a tooth on the opposite side of the notch than it was when I started. Is this better or worse? I reassembled everything and tried to start the bike. As stated in my previous post I havent had much luck starting the bike and pending carb issues that I am still working on (waiting for parts) as expected the bike still did not start. This time however, I got a loud pop/backfire coming out of the muffler that did not happen before and the spark plug which is brand new looked black. [ATTACH]14859.vB[/ATTACH] [B]My question is: [/B]Based on what I have shown and described does it look like the timing should be ok? Also what could the backfire and black spark plug be from? [/QUOTE]
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