SOHC.co.uk Forums > CB750
roller bearing vs. swinging arm bushes?
Phil:
Hi - has anyone experience of using roller bearings in place of swinging arm bushes? Would they be of benefit to a race bike? Any advice welcome!
Voxonda:
Hey Phil,
In my, humble, opinion based on a few experiences a bronze bushing is as good as, or even better, then a roller/needle bearing. 1st of all roller/needle bearings need to roll, they are not designed to operate in just a few degrees of motion. Second a roll bearing has a point contact area and a needle bearing a small line contact area. A bronze bushing, even with the same dimensions as the original bushing has a bigger contact area. The main problem, from all the swingarms I've seen is, the lack of, lubrication. Most of us don't bother to lubricate at all, or too little, the swingarm pivot. On my own, homemade, swingarm I have 2 nipples(?) directly placed on the bearings, so I am sure that they get grease.
If you service the pivot make sure you put in enough grease, watch the old grease being pushed out by the new grease. Use a good lithium based grease.
Cheers, Rob
Phil:
Thanks Rob - that certainly makes sense. M3 say that their "special bush" eliminates the "high speed death wobble" that CB750 are famous for! They can't supply and I wondered if the roller bearing might be a substitute. I have experienced the famous wobble (and survived to tell the tale!) and want to try to prevent it on this CR replica (I am too old to experience it again)! I have two frames - neither of which has any play that I can feel when the bile is stationary but since they are being blasted, welded-up, strengthened and painted, I thought I would do what I could. Thanks again!
Cheers
Phil
SteveD CB500K0:
--- Quote from: Phil on March 03, 2008, 09:17:39 PM ---when the bile is stationary
--- End quote ---
You need to see a doctor about that Phil...
Voxonda:
Hey Phil,
I have looked at the 'special'bushes from M3 racing, but these are a standard replacement for the original one's. I happen to provide a CB four specialist, http://www.fourdeel.com/, with these items. I make them out of a high(er) grade bronze.
Cheers, Rob
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