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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oilite or Lead-bronze bushes on Girdraulic, timing and RFM?
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<blockquote data-quote="Martyn Goodwin" data-source="post: 32042" data-attributes="member: 2433"><p>I HAD loaded nylon bushes in my Girdraulics but found that oil based lubricant caused then to swell then seize solid. I replaced them with BRONZE bushes that I got from Covenrty in the USA - I beileve these are exactly the same as those available thru the spares company............... Sorry Trev - but it is (just) my experience that the nylon stuff is rubbish.</p><p></p><p>As to movement within the girdraulics- I have set mine up with the bushes both turning on the spindles AND within the links - this is an area where you want freedom of movement without binding but at the same time, no lateral free play.</p><p></p><p>Also, talking about bushes - There are also bushes in the pivot points where the seat stays attach to the underside of the seat at the rear and there is another pivot point where the front of the seat attaches to the UFM. If ANY of these pivot points are binding then that additional and unwanted friction will have a detrimental impact on the overall performance of the rear suspension.</p><p></p><p>While the sintered bronze bearings in the seat stay end (FT111) are readily accessible and visible and thus most likely receive appropriate maintenance to keep them free, the bearing at the front of the seat is a different story. The front of the seat is positioned on a 3/8” seat pivot rod (F35/1) that passes thru a steel tube (F57/1) which itself passes thru the top hole at the rear of the UFM. There are two sintered bronze bushes (ET64), one each side, between the bore of the UFM hole and the thru tube. The intent is that the overall length of F57/1 is slightly greater than the length of the hole thru the UFM. What this means is that once the front seat bolts on F35/1 are tightened the seat frame is held securely (and unmoving) against the ends of the tube F57/1. However, because of the two sintered bronze bushes, the tube itself can readily rotate within the UFM and in turn the seat can also freely move in the vertical plane as required. Well that’s the theory! In my case I found that both ET64's were seized solid resulting in a seat that was very difficult to pivot.</p><p></p><p>The fix was a new F35/1, new ET64's (actually I sourced suitable oilite bushes from a local bearing supplier) and a home made replacement for F57/1 from suitable SS tube, so that I could be sure of the required fit and free movement. The hole in the UFM (for the ET64's was cleaned up using a sanding drum on my Dremel tool.</p><p></p><p>Martyn</p></blockquote><p></p>
[QUOTE="Martyn Goodwin, post: 32042, member: 2433"] I HAD loaded nylon bushes in my Girdraulics but found that oil based lubricant caused then to swell then seize solid. I replaced them with BRONZE bushes that I got from Covenrty in the USA - I beileve these are exactly the same as those available thru the spares company............... Sorry Trev - but it is (just) my experience that the nylon stuff is rubbish. As to movement within the girdraulics- I have set mine up with the bushes both turning on the spindles AND within the links - this is an area where you want freedom of movement without binding but at the same time, no lateral free play. Also, talking about bushes - There are also bushes in the pivot points where the seat stays attach to the underside of the seat at the rear and there is another pivot point where the front of the seat attaches to the UFM. If ANY of these pivot points are binding then that additional and unwanted friction will have a detrimental impact on the overall performance of the rear suspension. While the sintered bronze bearings in the seat stay end (FT111) are readily accessible and visible and thus most likely receive appropriate maintenance to keep them free, the bearing at the front of the seat is a different story. The front of the seat is positioned on a 3/8” seat pivot rod (F35/1) that passes thru a steel tube (F57/1) which itself passes thru the top hole at the rear of the UFM. There are two sintered bronze bushes (ET64), one each side, between the bore of the UFM hole and the thru tube. The intent is that the overall length of F57/1 is slightly greater than the length of the hole thru the UFM. What this means is that once the front seat bolts on F35/1 are tightened the seat frame is held securely (and unmoving) against the ends of the tube F57/1. However, because of the two sintered bronze bushes, the tube itself can readily rotate within the UFM and in turn the seat can also freely move in the vertical plane as required. Well that’s the theory! In my case I found that both ET64's were seized solid resulting in a seat that was very difficult to pivot. The fix was a new F35/1, new ET64's (actually I sourced suitable oilite bushes from a local bearing supplier) and a home made replacement for F57/1 from suitable SS tube, so that I could be sure of the required fit and free movement. The hole in the UFM (for the ET64's was cleaned up using a sanding drum on my Dremel tool. Martyn [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oilite or Lead-bronze bushes on Girdraulic, timing and RFM?
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