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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Setting up timing case
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<blockquote data-quote="davidd" data-source="post: 29753" data-attributes="member: 1177"><p>I do not think that you can set the spindles to the Factory specified height. I should say that you can, but you will have to do a lot of shimming to get the steady plate level. </p><p></p><p>I think that your instincts are correct. The ET 173s are very thick and will keep the steady plate quite high. What I did was to measure to the top of ET173 on the large idler. This is the only spindle that cannot be changed in height. Add in the specified clearance and this will be the height of the back side of the steady plate on all spindles. On the last engine I did it was .455" above the mating surface. I set the rest of the spindles to this accounting for the clearances and shims.</p><p></p><p>Once you have done all this careful work, the gears are installed and they must be aligned with shims for the best tooth engagement. Additionally, the cam followers and cams may need shimming so that the followers are tracking on the center of the lobe. This may change the tooth engagement and you have to go back and forth. Finally, you have to shim up from the spindle to give the correct end float. The steady plate will be dead flat. Unfortunately, you will need a large assortment of different sized shims to accomplish this. These are available from industrial supply houses, but not the Club.</p><p></p><p>One spindle may be a problem. The rear most cam follower spindle intersects with the clylinder stud. When installed it sat .50" above the mating line so it had to be removed and ground. This may be a problem based on the supplier, so it may not be an issue in all cases.</p><p></p><p>The Comet timing chest drawing that you cite I believe is the most recent revision. I found a mistake in it last year and it was revised.</p><p></p><p>David</p><p>Just measured my ET173 and it is 0.071" thick.</p></blockquote><p></p>
[QUOTE="davidd, post: 29753, member: 1177"] I do not think that you can set the spindles to the Factory specified height. I should say that you can, but you will have to do a lot of shimming to get the steady plate level. I think that your instincts are correct. The ET 173s are very thick and will keep the steady plate quite high. What I did was to measure to the top of ET173 on the large idler. This is the only spindle that cannot be changed in height. Add in the specified clearance and this will be the height of the back side of the steady plate on all spindles. On the last engine I did it was .455" above the mating surface. I set the rest of the spindles to this accounting for the clearances and shims. Once you have done all this careful work, the gears are installed and they must be aligned with shims for the best tooth engagement. Additionally, the cam followers and cams may need shimming so that the followers are tracking on the center of the lobe. This may change the tooth engagement and you have to go back and forth. Finally, you have to shim up from the spindle to give the correct end float. The steady plate will be dead flat. Unfortunately, you will need a large assortment of different sized shims to accomplish this. These are available from industrial supply houses, but not the Club. One spindle may be a problem. The rear most cam follower spindle intersects with the clylinder stud. When installed it sat .50" above the mating line so it had to be removed and ground. This may be a problem based on the supplier, so it may not be an issue in all cases. The Comet timing chest drawing that you cite I believe is the most recent revision. I found a mistake in it last year and it was revised. David Just measured my ET173 and it is 0.071" thick. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Setting up timing case
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