SOHC.co.uk Forums > CB750

swingarm needle/roller bearings

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haynes66:
has anyone replaced the swingarm bearings with either a roller or needle bearing? and if so, which bearing did you use?  i know standard practice is to use phosphor bronze but i'm working on something that needs a bearing. thanks

Bryanj:
There used to be some kits about but they were not that sucessfull as idealy a needle roller needs to rotate and a swing arm only moves a few degrees.

ka-ja:
You need taper roller bearings and a swing-arm with machined inner faces for the bearings to sit against to stop side play on the swing-arm

haynes66:
i'm working on a cbr 600 and the swingarm has two roller bearings on one side and a needle in the other. it does seem pointless as movement is limited, as you say. but most modern stuff has needle bearings these days. i'm fitting the cbr swingarm to the 750 but i dont want to modify the frame at all

K2-K6:
All non taper roller types need to use thrust washers or limiters in swingarm application to control lateral loading,  so that's no different with bronze or needle.

Needle rollers are fine with limited movement,  most two strokes use them on little end of con rod that doesn't rotate use small angular movement and many more duty cycles than swing arm bushes.

Is it an odd size you need to convert one to the other? Or have you got a bearing with a number on it?

If it's conversion it may just be easier to get a one off bronze bush made to spec,  but only because it would be more convenient to machine than get a specific needle bearing. 

Many of the monoshock linkages use needle roller too in highly loaded application.

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