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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Primary side main bearings
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<blockquote data-quote="greg brillus" data-source="post: 116958" data-attributes="member: 597"><p>No crush on the bearings, they have a tiny amount of float, difficult to measure.......John Trease here in australia told me to shim it up then do the crank nut up very tight, then you should be able to wiggle the timing side shaft just the smallest amount, so just a small amount of play in the bearings. They do not need any crush , because they are back to back, there is no expansion between the two, not like a Velocette or a bevel Ducati crank that do expand. I did not modify the bearing races either, I used the center stock circlip which I de -burred first to remove any protruding edges, then I modified an old ET 19 alloy spacer to get the inner bearing located where I wanted to locate the crank as best I could, the outer bearing cup up against the outer side of the circlip. Then made up several spacers to go between the two center races, and fine tune to get the shimming correct........this takes many goes to get right. The tension of the crank nut is especially important, if it comes loose then the bearings separate and the crank would become quite noisy I would imagine. Like I said, it's a great mod but takes some setting up to get correct.........This is the same bearing set up that Neal and Rodney used on the new series"A" twins, I would say from advice given by John Trease who did all the machining on the new twin engines.......sadly no longer with us.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 116958, member: 597"] No crush on the bearings, they have a tiny amount of float, difficult to measure.......John Trease here in australia told me to shim it up then do the crank nut up very tight, then you should be able to wiggle the timing side shaft just the smallest amount, so just a small amount of play in the bearings. They do not need any crush , because they are back to back, there is no expansion between the two, not like a Velocette or a bevel Ducati crank that do expand. I did not modify the bearing races either, I used the center stock circlip which I de -burred first to remove any protruding edges, then I modified an old ET 19 alloy spacer to get the inner bearing located where I wanted to locate the crank as best I could, the outer bearing cup up against the outer side of the circlip. Then made up several spacers to go between the two center races, and fine tune to get the shimming correct........this takes many goes to get right. The tension of the crank nut is especially important, if it comes loose then the bearings separate and the crank would become quite noisy I would imagine. Like I said, it's a great mod but takes some setting up to get correct.........This is the same bearing set up that Neal and Rodney used on the new series"A" twins, I would say from advice given by John Trease who did all the machining on the new twin engines.......sadly no longer with us. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Primary side main bearings
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