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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Chopped Cases
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<blockquote data-quote="davidd" data-source="post: 165791" data-attributes="member: 1177"><p>The belt will not provide any significant damping. If that were true, modern cars that use these belts for timing belts would have variable timing, which is not the case. The saving grace of these systems is that usually the clutch is far superior to older clutches and will work admirably under very tough conditions. The ESA does most of its work when starting from a stop, which is not what race bikes are required to do during races. </p><p></p><p>I think the decision comes down to deciding if you can trust this compromised bearing journal to be as reliable as a stock one. Otherwise, you will spend tens of thousands of Pounds building a Lightning with a risky mechanical problem. If you had posed the question as one of "I have to run a 1/8" wide drive bearing because I don't have room for a stock one..." I suspect the eagerness to build an expensive bike around this problem would diminish. The fact that it is difficult to measure the damage done is not a good reason to ignore the problem.</p><p></p><p>That being said, I think the journal could be repaired. It will take some skill, but it is worth discussing. If the journal can be strengthened, you could install a clutch with a cush drive, or a rear hub with a cush drive, and that would allow you to use a belt or chain with good results. If you have concerns about locating the crankshaft, you might consider running a ball-bearing conversion for the main, which tends to prevent the crank from moving. You will have one circlip, and the nut on the end of the main to help keep the crank in place.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 165791, member: 1177"] The belt will not provide any significant damping. If that were true, modern cars that use these belts for timing belts would have variable timing, which is not the case. The saving grace of these systems is that usually the clutch is far superior to older clutches and will work admirably under very tough conditions. The ESA does most of its work when starting from a stop, which is not what race bikes are required to do during races. I think the decision comes down to deciding if you can trust this compromised bearing journal to be as reliable as a stock one. Otherwise, you will spend tens of thousands of Pounds building a Lightning with a risky mechanical problem. If you had posed the question as one of "I have to run a 1/8" wide drive bearing because I don't have room for a stock one..." I suspect the eagerness to build an expensive bike around this problem would diminish. The fact that it is difficult to measure the damage done is not a good reason to ignore the problem. That being said, I think the journal could be repaired. It will take some skill, but it is worth discussing. If the journal can be strengthened, you could install a clutch with a cush drive, or a rear hub with a cush drive, and that would allow you to use a belt or chain with good results. If you have concerns about locating the crankshaft, you might consider running a ball-bearing conversion for the main, which tends to prevent the crank from moving. You will have one circlip, and the nut on the end of the main to help keep the crank in place. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Chopped Cases
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