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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big End Replacement
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<blockquote data-quote="passenger0_0" data-source="post: 86887" data-attributes="member: 208"><p>I've done a few built-up cranks (Indian, Vincent twin etc. ....) in the past and personally wouldn't align them on centres unless these have previously been ground true to the main shafts. I used a tool room centre-grinder as you don't know how much the shaft centre has been pushed around by over zealous use of an extractor. I've also seen a drive-side main shaft that was twisted with 0.006" run out on the main bearing surface when run on centres. Mentioning this to the owner he told me several years ago he had locked up the engine at revs when the main shaft bush seized in second gear. Strange it had been vibrating a bit since then and pulled out its main bearings from the cases.</p><p></p><p>There are roller type set ups out there for truing cranks but I prefer plain knife edges located on where the main bearings are located.</p><p></p><p>All to their own I suppose. I now don't have access to specialised equipment so entrust my cranks to others.</p></blockquote><p></p>
[QUOTE="passenger0_0, post: 86887, member: 208"] I've done a few built-up cranks (Indian, Vincent twin etc. ....) in the past and personally wouldn't align them on centres unless these have previously been ground true to the main shafts. I used a tool room centre-grinder as you don't know how much the shaft centre has been pushed around by over zealous use of an extractor. I've also seen a drive-side main shaft that was twisted with 0.006" run out on the main bearing surface when run on centres. Mentioning this to the owner he told me several years ago he had locked up the engine at revs when the main shaft bush seized in second gear. Strange it had been vibrating a bit since then and pulled out its main bearings from the cases. There are roller type set ups out there for truing cranks but I prefer plain knife edges located on where the main bearings are located. All to their own I suppose. I now don't have access to specialised equipment so entrust my cranks to others. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big End Replacement
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