Trying - still - to ressurect my 450 K1 and have replaced the swing arm bushes with "top-hat" bronze ones bought off e-bay:
https://www.ebay.com/itm/162443197121?ul_noapp=true
Although the listing doesn't say they fit the CB450, other offers, and the parts fiches I checked, showed the same part numbers for the CB750 and in his "My CB750 Book", Mark Parris says, "The swing arm pivot and support system came straight from the CB450 frame", so I reckoned these would fit.
Well they did - the length was a bit shorter that the ones removed, but I didn't think that would affect anything adversely. They slid nicely into the swing arm, freezer plus a bit of grease, and the pivot is a free sliding fit. I wondered if this was too free!
However when I put the whole assembly back on the bike, with the dust seal cap, and tightened up the bolt, there was considerable side to side play. And I mean considerable - a very discernable knock can be felt and the movement seen. The arm falls easily under it's own weight.
The thickness of the bronze bush shoulder compares favourably (it's thicker) with the thickness of the removed plastic bush that covers the felt washer (1.88mm vs 1.84). The pivot protudes from the end of the swing arm (0.9mm/2).
I've know that on CB750s loosening the engine mounting bolts makes it easier to remove the swing arm and presumably tightening them has the opposite affect; does the same apply to the 450? Thought I doubt it would make enough difference.
Have I missed something? Any advice is welcome.
Sean
https://www.ebay.com/itm/162443197121?ul_noapp=true
Although the listing doesn't say they fit the CB450, other offers, and the parts fiches I checked, showed the same part numbers for the CB750 and in his "My CB750 Book", Mark Parris says, "The swing arm pivot and support system came straight from the CB450 frame", so I reckoned these would fit.
Well they did - the length was a bit shorter that the ones removed, but I didn't think that would affect anything adversely. They slid nicely into the swing arm, freezer plus a bit of grease, and the pivot is a free sliding fit. I wondered if this was too free!
However when I put the whole assembly back on the bike, with the dust seal cap, and tightened up the bolt, there was considerable side to side play. And I mean considerable - a very discernable knock can be felt and the movement seen. The arm falls easily under it's own weight.
The thickness of the bronze bush shoulder compares favourably (it's thicker) with the thickness of the removed plastic bush that covers the felt washer (1.88mm vs 1.84). The pivot protudes from the end of the swing arm (0.9mm/2).
I've know that on CB750s loosening the engine mounting bolts makes it easier to remove the swing arm and presumably tightening them has the opposite affect; does the same apply to the 450? Thought I doubt it would make enough difference.
Have I missed something? Any advice is welcome.
Sean