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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
identifying cams
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<blockquote data-quote="BigEd" data-source="post: 22772" data-attributes="member: 161"><p>My basket case came with some reground cams and no identification and I assumed that they would be MK 1 cams. The timing marks on the gears were not to be trusted so I spent many a happy hour twirling the engine around with a degree disk and pointer trying to identify opening and closing points. Eventually I found positions that I thought came closest to published figures. The engine started OK and has run thus for around 20,000 miles. A while ago (here or perhaps on another forum) in a discussion about cam timing Tom Gaynor said that he had found that bikes timed with equal lift around 4-6 degrees BTDC on the overlap gave good performance whatever the opening closing figures. When I subsequently check my timing using this method I found that I had indeed got equal valve lift around 4-6 degrees BTDC. Vibrac states in an earlier post in this thread that he also uses this method. </p><p>In the absence of identifying marks why not try the equal lift method and just check carefully that you have sufficient clearance everywhere.</p></blockquote><p></p>
[QUOTE="BigEd, post: 22772, member: 161"] My basket case came with some reground cams and no identification and I assumed that they would be MK 1 cams. The timing marks on the gears were not to be trusted so I spent many a happy hour twirling the engine around with a degree disk and pointer trying to identify opening and closing points. Eventually I found positions that I thought came closest to published figures. The engine started OK and has run thus for around 20,000 miles. A while ago (here or perhaps on another forum) in a discussion about cam timing Tom Gaynor said that he had found that bikes timed with equal lift around 4-6 degrees BTDC on the overlap gave good performance whatever the opening closing figures. When I subsequently check my timing using this method I found that I had indeed got equal valve lift around 4-6 degrees BTDC. Vibrac states in an earlier post in this thread that he also uses this method. In the absence of identifying marks why not try the equal lift method and just check carefully that you have sufficient clearance everywhere. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
identifying cams
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