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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve Springs
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<blockquote data-quote="Monkeypants" data-source="post: 113946" data-attributes="member: 2708"><p>John M told me that seat pressure on his Shadow was 120 at install.</p><p>My 1360 was set at 105. I checked it with Dan Smith's home built test rig as well as John's more sophisticated device.</p><p>Both gave the same number.</p><p>As mentioned elsewhere, the cams and followers looked perfect at 1500 miles. Now it has 5,000 on it, I might have another look.</p><p>I think it's OK as the magnetic drain plug is clean and tappet clearance hasn't changed. </p><p>Cam damage can occur with a low spring pressure that allows the valve train to lose contact with the cam then slam back down at high rpm.</p><p>I think this might occur more often than we realize. It would explain why one rider has all kinds of cam and follower wear while another rider with the same components does not.</p><p>2 or 3 hundred RPM can make quite a difference. </p><p>I used to see this on little Honda engines in the 60s&70s but didn't understand the cause at the time.</p><p></p><p>Glen</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 113946, member: 2708"] John M told me that seat pressure on his Shadow was 120 at install. My 1360 was set at 105. I checked it with Dan Smith's home built test rig as well as John's more sophisticated device. Both gave the same number. As mentioned elsewhere, the cams and followers looked perfect at 1500 miles. Now it has 5,000 on it, I might have another look. I think it's OK as the magnetic drain plug is clean and tappet clearance hasn't changed. Cam damage can occur with a low spring pressure that allows the valve train to lose contact with the cam then slam back down at high rpm. I think this might occur more often than we realize. It would explain why one rider has all kinds of cam and follower wear while another rider with the same components does not. 2 or 3 hundred RPM can make quite a difference. I used to see this on little Honda engines in the 60s&70s but didn't understand the cause at the time. Glen [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve Springs
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