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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Front spring boxes breather hole?
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<blockquote data-quote="greg brillus" data-source="post: 173869" data-attributes="member: 597"><p>If you are running an AVO on the front of a Comet, even on its softest setting it will be too stiff........I found the Avo's are only "ok" on a twin........The spring set up is no good.........you should be using 2 x 36 lb springs with about 25 to 30 mm cut off each one.......using them uncut you will have way too much pre load.........This is what is causing the front end to be topped out.......A reconditioned original or a new Maughan's shocker is best for a Comet........Soft long springs with too much pre load and a stiff shock absorber is not the way to get a decent ride........Earlier this year we took 3 bikes on the first Tasmanian Vincent rally.......my 21 year old son rode our fully restored Comet using this set up on the front for over 2000 km's and no front end issues.......next to my twin racer, the pic on the left, this Comet is probably the nicest most compliant Vincent i have ever owned.......If you shorten the cases by about 15 mm max each as per Norman's instructions the front end should not bottom unless you hit something very heavily........Only when I used the soft 30 lb springs, i could easily bottom the front end.........remember it is the springs and the springs alone that support the weight of the bike and rider do not be tempted to mask the weak springs using a stiff shocker.......this is wrong........read up on some info from the bike suspension experts. The best way to test how well the springs will cope is to ride the bike not too far and using the brakes not too aggressively with the front shock absorber removed all together........this will tell you quickly if the springs are able to cope or not........When i tried this with the 30 lb springs, the front end bottomed very easily........the 36 lb ones came out best, but only once shortened to reduce the amount of pre load.......the bike at rest should not sit "Topped out" you should be able to pull up on the bars and lift the bike a little.......always use the longer eyebolts for the lower shock mount no matter what shock absorber you use........if you use the shorter ones you will loose some of the suspension travel........the rest is up to the back end, but that is a different story.........Good luck with it.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 173869, member: 597"] If you are running an AVO on the front of a Comet, even on its softest setting it will be too stiff........I found the Avo's are only "ok" on a twin........The spring set up is no good.........you should be using 2 x 36 lb springs with about 25 to 30 mm cut off each one.......using them uncut you will have way too much pre load.........This is what is causing the front end to be topped out.......A reconditioned original or a new Maughan's shocker is best for a Comet........Soft long springs with too much pre load and a stiff shock absorber is not the way to get a decent ride........Earlier this year we took 3 bikes on the first Tasmanian Vincent rally.......my 21 year old son rode our fully restored Comet using this set up on the front for over 2000 km's and no front end issues.......next to my twin racer, the pic on the left, this Comet is probably the nicest most compliant Vincent i have ever owned.......If you shorten the cases by about 15 mm max each as per Norman's instructions the front end should not bottom unless you hit something very heavily........Only when I used the soft 30 lb springs, i could easily bottom the front end.........remember it is the springs and the springs alone that support the weight of the bike and rider do not be tempted to mask the weak springs using a stiff shocker.......this is wrong........read up on some info from the bike suspension experts. The best way to test how well the springs will cope is to ride the bike not too far and using the brakes not too aggressively with the front shock absorber removed all together........this will tell you quickly if the springs are able to cope or not........When i tried this with the 30 lb springs, the front end bottomed very easily........the 36 lb ones came out best, but only once shortened to reduce the amount of pre load.......the bike at rest should not sit "Topped out" you should be able to pull up on the bars and lift the bike a little.......always use the longer eyebolts for the lower shock mount no matter what shock absorber you use........if you use the shorter ones you will loose some of the suspension travel........the rest is up to the back end, but that is a different story.........Good luck with it. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Front spring boxes breather hole?
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