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Anorak's Corner / CB750K0/Sandcast Master Cylinder Differences from Later SOHC/4 models.
« on: October 12, 2023, 07:13:00 PM »
Does anyone know what the differences are between the body of the CB750K0 brake master cylinder and the late 500/4 400/4 variants?
I know that the early 750 had the adjustable stop arrangement and the later one had the rubber cushion insert and plate arrangement. Plus the cap on the early bike was dished on top and didn't have the DOT emblem on it. However, by tapping the hole in the later one I dare say you could replicate the original stud and lock-nut arrangement on a later body.
I have an early 750 one with decent un-pitted bore but some idiot PO has drilled out the tiny hole inside the reservoir. I wonder if that could have an insert put into it with the same size hole dia. There are brass inserts similar to this in the tops of Honda CV carbs (under the diaphragm/piston assembly). I think I read somewhere that Vic World has master cylinders re-lined but never heard of a repair on the tiny hole in the reservoir chamber.
I know that the early 750 had the adjustable stop arrangement and the later one had the rubber cushion insert and plate arrangement. Plus the cap on the early bike was dished on top and didn't have the DOT emblem on it. However, by tapping the hole in the later one I dare say you could replicate the original stud and lock-nut arrangement on a later body.
I have an early 750 one with decent un-pitted bore but some idiot PO has drilled out the tiny hole inside the reservoir. I wonder if that could have an insert put into it with the same size hole dia. There are brass inserts similar to this in the tops of Honda CV carbs (under the diaphragm/piston assembly). I think I read somewhere that Vic World has master cylinders re-lined but never heard of a repair on the tiny hole in the reservoir chamber.