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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Vincent BC&D Valve Spring Data
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<blockquote data-quote="timetraveller" data-source="post: 16896" data-attributes="member: 456"><p>Hi John, no shims are required as the top valve guide is shaped to pre-tension the inner spring (ET39/1) However, did you know that Terry provides alternative springs which can take the extra lift without coil binding and yet give the original seat pressures. They are the correct springs to use with Terry's special cams. I checked the profile, timing etc of a set of these cams for a friend some years ago and thought that they would be fairly extreme for road use. Sadly the friend died before the bike was finished so that there was never any feedback as to how they actually performed. I do remember that the cam nose fouled the boss in the timing cover which takes the spindle for the rear valve lifter so check very carefully when you install them as you might have to grind that back a little as I had to in my test engine. Good luck.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 16896, member: 456"] Hi John, no shims are required as the top valve guide is shaped to pre-tension the inner spring (ET39/1) However, did you know that Terry provides alternative springs which can take the extra lift without coil binding and yet give the original seat pressures. They are the correct springs to use with Terry's special cams. I checked the profile, timing etc of a set of these cams for a friend some years ago and thought that they would be fairly extreme for road use. Sadly the friend died before the bike was finished so that there was never any feedback as to how they actually performed. I do remember that the cam nose fouled the boss in the timing cover which takes the spindle for the rear valve lifter so check very carefully when you install them as you might have to grind that back a little as I had to in my test engine. Good luck. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Vincent BC&D Valve Spring Data
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