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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="timetraveller" data-source="post: 77913" data-attributes="member: 456"><p>I think that it is worthwhile just recalling how we got here. Originally Chris, a heavy rider with a fully equipped road bike, tried to fit 'D' long springs. That was not reported as they would not fit into the space available. The next step was just the outer 'C' springs, 56 lbs/inch, which fitted but gave limited travel. Next came the 36 lbs/inch springs which, in combination with the AVO damper seem to work perfectly. Then the Oilite bushes were changed to needle roller bearings , but only where the eccentrics go originally, and that has freed up the movement to the extent that there now seems to be not enough resistance. Note that all that has changed is the amount of friction. When it comes to measuring the amount of movement at the front end as various spring strengths are use I urge adopting the method of using a cable tie around the inner spring box. Position it where the base of the top spring box is with the bike either unloaded or with only the rider seated and then go out and find some rough roads. When you get back you will be able to see exactly what movement has taken place on the spring boxes. If it is bottoming out it will be clear and we will know that stronger springs might be needed. You are looking for a movement of about half an inch between the bike on its own and with the rider seated and about three inches total over rough roads. However, we still have to explain why a change in frictional resistance seems to indicate a need for stronger springs and to find out whether stronger damping would be the answer. Greg is absolutely correct, change one thing at a time and then measure.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 77913, member: 456"] I think that it is worthwhile just recalling how we got here. Originally Chris, a heavy rider with a fully equipped road bike, tried to fit 'D' long springs. That was not reported as they would not fit into the space available. The next step was just the outer 'C' springs, 56 lbs/inch, which fitted but gave limited travel. Next came the 36 lbs/inch springs which, in combination with the AVO damper seem to work perfectly. Then the Oilite bushes were changed to needle roller bearings , but only where the eccentrics go originally, and that has freed up the movement to the extent that there now seems to be not enough resistance. Note that all that has changed is the amount of friction. When it comes to measuring the amount of movement at the front end as various spring strengths are use I urge adopting the method of using a cable tie around the inner spring box. Position it where the base of the top spring box is with the bike either unloaded or with only the rider seated and then go out and find some rough roads. When you get back you will be able to see exactly what movement has taken place on the spring boxes. If it is bottoming out it will be clear and we will know that stronger springs might be needed. You are looking for a movement of about half an inch between the bike on its own and with the rider seated and about three inches total over rough roads. However, we still have to explain why a change in frictional resistance seems to indicate a need for stronger springs and to find out whether stronger damping would be the answer. Greg is absolutely correct, change one thing at a time and then measure. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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