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Hi Trigger,Thank you for your knowledge and advice.Attached are two pictures of the gearbox sprocket cover, on which I can see nothing to mount a sprocket case protector.I note that my bike (E1036***) has been upgraded with 18-front and 48-tooth rear sprockets, introduced at Engine number 1044805. I also note that it has, as expected, the 'so called' adjustable chain oiler, introduced at E1026144, on the front sprocket. I imagine the sprocket case protector, that was introduced to cover the previous 17-tooth sprocket, may be too small in diameter to cover an 18-tooth?Whilst trying to make my bike perfectly correct, it seems only sensible to retain the 18/48 tooth set-up and avoid disaster!
Yes they all had a chain oiler, but prior to E1026144 it used a felt plug that could not be adjusted. The latter oiler provided a screw to adjust the amount of oil (screw in to reduce), though of questionable effectiveness. I've got mine screwed right in to see if the chain drys.Service Bulletin #30 expands.https://www.dropbox.com/s/xkkwyl5lteti976/CB750%20Service%20Bulletins.pdf?dl=0