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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve Timing
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<blockquote data-quote="Gary Gittleson" data-source="post: 118438" data-attributes="member: 3625"><p>All of the above points are well taken but I'd like to add an observation. By coincidence, I have bin fiddling with my timing side to solve some oil leaks and noticed that Mr. Richardson's diagram (the same as the one in the rider's handbook) illustrates the the rear cylinder at TDC but what is not mentioned is that with the cams in those positions, assuming they were never pushed out of the gears and reinstalled, the rear cylinder is on the top of the <em>exhaust</em> stroke and the front is 50 degrees from the top of the <em>compression</em> stroke.</p><p></p><p>It seems to be a natural assumption that the diagram would show TDC on compression at the rear, but it doesn't. </p><p></p><p>One more point. Paul Richardson does mention that the position of the keyway on the crankshaft is not significant and can differ from bike to bike. My bike conforms to the Richardson diagram but like Steve's had the crank keyway at 5 O'clock.</p><p></p><p>My suggestion would be to set the bike up that way as a starting point and then check with dial indicators. I think Steve merely needs to flip the cams 180 degrees and re-check.</p><p></p><p>I had gone through all of this a couple of years ago, in order to deal with gear backlash and pinion end float. I got a new steel idler and naturally had to replace the half-time pinion which necessitated the use of dial indicators to find the best keyway for valve timing. I then marked the pinion but found that the original marks worked very well. In this new job of fixing the oil leaks, I accidentally pulled the front cam off its pinion and had to recheck the time to get it back in the right place.</p><p></p><p>Gary</p></blockquote><p></p>
[QUOTE="Gary Gittleson, post: 118438, member: 3625"] All of the above points are well taken but I'd like to add an observation. By coincidence, I have bin fiddling with my timing side to solve some oil leaks and noticed that Mr. Richardson's diagram (the same as the one in the rider's handbook) illustrates the the rear cylinder at TDC but what is not mentioned is that with the cams in those positions, assuming they were never pushed out of the gears and reinstalled, the rear cylinder is on the top of the [I]exhaust[/I] stroke and the front is 50 degrees from the top of the [I]compression[/I] stroke. It seems to be a natural assumption that the diagram would show TDC on compression at the rear, but it doesn't. One more point. Paul Richardson does mention that the position of the keyway on the crankshaft is not significant and can differ from bike to bike. My bike conforms to the Richardson diagram but like Steve's had the crank keyway at 5 O'clock. My suggestion would be to set the bike up that way as a starting point and then check with dial indicators. I think Steve merely needs to flip the cams 180 degrees and re-check. I had gone through all of this a couple of years ago, in order to deal with gear backlash and pinion end float. I got a new steel idler and naturally had to replace the half-time pinion which necessitated the use of dial indicators to find the best keyway for valve timing. I then marked the pinion but found that the original marks worked very well. In this new job of fixing the oil leaks, I accidentally pulled the front cam off its pinion and had to recheck the time to get it back in the right place. Gary [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve Timing
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