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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Catastrophic camshaft and follower failure - any ideas?
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<blockquote data-quote="hrdsuper90" data-source="post: 5542" data-attributes="member: 55"><p><strong>Installation ???</strong></p><p></p><p>Dear Stuart,</p><p>What a sad sight - commiserations ! </p><p>One group of possible problems associated with installing high lift cams like Mk2, are clearances. Guides need to be flush with the lock ring but there are a number of further variables associated with valves, such as position of the collar etc. Mk2's have a lift (at the valve) of .365" but I did install eccentric rockers that raised that to .405" , this looked like the maximum in an original head. </p><p>As a matter of course after a build I pre-load the tappet by .050" - .065" and gently turn the engine over and check the clearances. This checks everything, ensures the springs aren't coil bound and valve clearances to the piston. It's a simple check that served me well. </p><p></p><p>Regards, Chris</p></blockquote><p></p>
[QUOTE="hrdsuper90, post: 5542, member: 55"] [b]Installation ???[/b] Dear Stuart, What a sad sight - commiserations ! One group of possible problems associated with installing high lift cams like Mk2, are clearances. Guides need to be flush with the lock ring but there are a number of further variables associated with valves, such as position of the collar etc. Mk2's have a lift (at the valve) of .365" but I did install eccentric rockers that raised that to .405" , this looked like the maximum in an original head. As a matter of course after a build I pre-load the tappet by .050" - .065" and gently turn the engine over and check the clearances. This checks everything, ensures the springs aren't coil bound and valve clearances to the piston. It's a simple check that served me well. Regards, Chris [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Catastrophic camshaft and follower failure - any ideas?
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