750F1 Rear Master Cylinder

[Grewth]

I'm lucky enough to have a spare one for my F1, but the bad news is that the one on the bike,  and the spare,  were both seized solid.
I stripped down the spare, and gave it a half hour roasting on the gas hob, which freed up the plunger core, and I managed to extract it.
Now I'm wondering if the bore is going to be good enough to take a repair kit.
I'm wondering if it would be possible to bore out the cylinder body, and fit some sort of liner ?
I've got enough engineering skills to convert the bike to a modern, pattern cylinder,  but I'd really rather keep it original looking.

[Bryanj]

There should be enough meat for a thinwall liner, if its been sized that bad its probably too corroded for a seal kit, i think a GL 1000 one is the same

[Skoti]

Aye,

I fitted a genuine Honda GL1000 repair kit (43510 371 305) to my CB750F1 when the proper kits were unavailable.

Push rod was different length but every thing else fitted ok, so as Brian says the GL1000 rear master cylinder is probably the same.

Good luck

[Grewth]

Many thanks !
I've still got the one on the bike to go at, I'll pick the best one