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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
how easy is it time the mag on shadow
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<blockquote data-quote="Gerry Clarke" data-source="post: 93618" data-attributes="member: 2120"><p>I use the simple device Bill mentioned above. The upper end of the rod is larger than the hole through its spark-plug like body so the rod, which is graduated in mm can't fall into the cylinder. The rod is graduated in mm and also has a small o-ring and you can tell from the psst sounds what stroke you are on.</p><p></p><p>I don't believe the piston shape matters though. The rod will contact the piston at a given point and that point will rise and fall consistently. What can easily be done is compensate for the angle. The rod is moving as the hypotenuse of a right angle triangle and we are interested in the vertical side. If you know the angle of the plug-hole, simple trig. gives the compensation factor. For example it's 90% of the rod movement if the angle is 60 degrees and 70% if the angle is 45 degrees. </p><p></p><p>I fitted a manual advance to my twin when I had it, and this made timing even easier as it ran slack wire advance. From memory, 34 degrees advance is approx. 3/8", remembering to rotate the engine backwards first to take up all the backlash in the gears.</p><p></p><p>I have to admit I used a pencil for most of my life. Funny what you are shown as a teenager sticks - I guess that's because it worked!</p><p></p><p>Gerry</p></blockquote><p></p>
[QUOTE="Gerry Clarke, post: 93618, member: 2120"] I use the simple device Bill mentioned above. The upper end of the rod is larger than the hole through its spark-plug like body so the rod, which is graduated in mm can't fall into the cylinder. The rod is graduated in mm and also has a small o-ring and you can tell from the psst sounds what stroke you are on. I don't believe the piston shape matters though. The rod will contact the piston at a given point and that point will rise and fall consistently. What can easily be done is compensate for the angle. The rod is moving as the hypotenuse of a right angle triangle and we are interested in the vertical side. If you know the angle of the plug-hole, simple trig. gives the compensation factor. For example it's 90% of the rod movement if the angle is 60 degrees and 70% if the angle is 45 degrees. I fitted a manual advance to my twin when I had it, and this made timing even easier as it ran slack wire advance. From memory, 34 degrees advance is approx. 3/8", remembering to rotate the engine backwards first to take up all the backlash in the gears. I have to admit I used a pencil for most of my life. Funny what you are shown as a teenager sticks - I guess that's because it worked! Gerry [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
how easy is it time the mag on shadow
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