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I recently bought a 1970 CL100 and yes I know it’s not a twin but I don’t know another forum to post this on. I want to replace the crank bearings but they are pressed onto the crank rather than into the case. And one of the bearings has the timing sprocket in the way. It’s pressed on but isn’t keyed to the crank so if I take the sprocket off how do I know what position it should be in when it goes back on? And how should I go about pulling off the sprocket and bearings? Any advice would be greatly appreciated.
 

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Does the keyway line up with the sprocket tooth? You can scribe a line with a tunģsten scriber and measure the depth from crank end to be sure it goes back on the same. A machine shop can do the pressing and check the crank for runout. The pressed on sprockets can move, resulting in retarded cam timing. Best to check it with a degree wheel. Search for how to check cam phasing. I did it on my 160 and found my cam timing was off 10 deg.
 
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