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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big End Replacement
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<blockquote data-quote="timetraveller" data-source="post: 86920" data-attributes="member: 456"><p>OK Cyborg; that is correct. It sounds like you have access to some good equipment to check the centre of the crankpin hole and it is worth doing. The one I mentioned above is the only one where I have seen this problem out of tens of them and I suspect it was a mismatched pair of flywheels that had come from different sources. Whether the works made them so that they could be interchanged or made them in batches which were all matched but perhaps a few thou different from each other I don't know. David, who regularly contributes on here, would know. Remember that a six thou run out on one side is only three thou difference in the centre to centre distance. When racing I always used the mod described by Bill of pegging the drive side main shaft into the flywheel with a quarter inch roller. You are right that it should not be needed for road use but can do no harm. Picadors and some racing engines used larger diameter drive side main shafts, 1.125" versus 1.0", to overcome the problem of the shafts turning in the wheels.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 86920, member: 456"] OK Cyborg; that is correct. It sounds like you have access to some good equipment to check the centre of the crankpin hole and it is worth doing. The one I mentioned above is the only one where I have seen this problem out of tens of them and I suspect it was a mismatched pair of flywheels that had come from different sources. Whether the works made them so that they could be interchanged or made them in batches which were all matched but perhaps a few thou different from each other I don't know. David, who regularly contributes on here, would know. Remember that a six thou run out on one side is only three thou difference in the centre to centre distance. When racing I always used the mod described by Bill of pegging the drive side main shaft into the flywheel with a quarter inch roller. You are right that it should not be needed for road use but can do no harm. Picadors and some racing engines used larger diameter drive side main shafts, 1.125" versus 1.0", to overcome the problem of the shafts turning in the wheels. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big End Replacement
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