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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Suspension - please explain.
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<blockquote data-quote="timetraveller" data-source="post: 121492" data-attributes="member: 456"><p><em><strong>What is the Greg Brillus mod to the oilite bushes>? </strong></em></p><p>The mod consists of removing the Oilite bushes totally and boring both rear eyes of the lower link by a few thou to take a 32 mm O.D. ball race, two ball races each side so four in total. Some other people have replaced the Oilite bushes with needle roller bearings. If I supply the whole kit which I think gives the best ride, performance etc. then stainless steel concentrics are supplied to replace the original eccentrics which went through the Oilite bushes. Occasionally there has been some misunderstanding in that there are those who think that these concentrics are fundamental to the modification. Not so. The fact that they are concentric is not important. There is one size of concentric if the Oilite bushes are to be used and another if the ball race mod is to be used. It is not the fact that this is a concentric which is important but the geometry of the centre of rotation for the rear of the lower link which changes the geometry. It is the geometry of the lower motion block of the new steering head which effects the change.</p><p>The reason that I recommend the Greg type conversion to anyone who can afford to spend the extra money is that when Chris Launders was doing the original test riding we had a perfectly good system consisting of the normal AVO damper and 36 lbs/inch springs with three inches of pre-load. When Chris removed the Oilites and, in his case, replaced them with needle rollers the front of the bike 'pogo sticked ' so badly that we thought that the damper had failed. The reduction in friction led us eventually to going to 45 lbs/inch springs with just over two and a half inches of pre-load and a stiffer damper. Chris weighs about 20 stones/127 kg and it was this that lead me slowly to the understanding that the total mass that one is springing and damping has to be taken into account.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 121492, member: 456"] [I][B]What is the Greg Brillus mod to the oilite bushes>? [/B][/I] The mod consists of removing the Oilite bushes totally and boring both rear eyes of the lower link by a few thou to take a 32 mm O.D. ball race, two ball races each side so four in total. Some other people have replaced the Oilite bushes with needle roller bearings. If I supply the whole kit which I think gives the best ride, performance etc. then stainless steel concentrics are supplied to replace the original eccentrics which went through the Oilite bushes. Occasionally there has been some misunderstanding in that there are those who think that these concentrics are fundamental to the modification. Not so. The fact that they are concentric is not important. There is one size of concentric if the Oilite bushes are to be used and another if the ball race mod is to be used. It is not the fact that this is a concentric which is important but the geometry of the centre of rotation for the rear of the lower link which changes the geometry. It is the geometry of the lower motion block of the new steering head which effects the change. The reason that I recommend the Greg type conversion to anyone who can afford to spend the extra money is that when Chris Launders was doing the original test riding we had a perfectly good system consisting of the normal AVO damper and 36 lbs/inch springs with three inches of pre-load. When Chris removed the Oilites and, in his case, replaced them with needle rollers the front of the bike 'pogo sticked ' so badly that we thought that the damper had failed. The reduction in friction led us eventually to going to 45 lbs/inch springs with just over two and a half inches of pre-load and a stiffer damper. Chris weighs about 20 stones/127 kg and it was this that lead me slowly to the understanding that the total mass that one is springing and damping has to be taken into account. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Suspension - please explain.
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