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CB750 K0 Front Sprocket Case Protector

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StevieWonder:
According to John Wyatt, my 1970 CB750 K0 (Engine Number 1036****) should be fitted with a case protector (Part No: 11353 300 010) around the front drive sprocket, but it isn’t. Apparently, the front sprocket cover was modified at E1026144 to accept the case protector. I’m thinking my sprocket cover may be from an earlier bike, though I can’t find any pictures to show how they differ. Grateful if any of you could enlighten me.

Trigger:
Honda had a design problem on the early units. The chain would jump if loose and punch a hole in the crank case, honda came up with a case protector but all this did was push the protector through the crank case. After a lot of head scratching in the land of the raising sun, they found that putting a extra tooth sprocket solved the problem and did away with the protector.
There is a cut away in the sprocket cover so that it fits with a protector. Show me a pic of the top of the cover and I will tell you what type it is  ;)

StevieWonder:
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!

Trigger:
The protector does not mount on the sprocket cover, it bolts to the crank case.
Found one that was used with a protector, it is the one on the left and has a cut away. I have had many of these sprocket covers through my workshops over the years and some had a different cut away and looked like it was just cut at a work shop when they fitted a protector.

I would not take John Wyatt book as gospel, or anyone else's  ;) [ Guests cannot view attachments ]

Trigger:
The top mounts here



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