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I have a 70 CB450K3 and the splines on my shift shaft have been almost completely worn down. I was wondering if I needed to split the cases in order to replace the shaft or if there is an easier way to go about it.
 

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You could fit the shifter on the shaft and drill a hole along the worn splines. The drill should split the shaft and shifter leaving a 1/2 hole in each. Then a tight fitting pin will hold it. You can swap it out in the frame without splitting the cases if you so desire too.
 
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