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CB750 F1 front caliper

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hairygit:
The bolts that join the 2 caliper halves on the F1, K7 and A are spaced about 4mm further apart than all the other fours, the piston is about 30 though larger diameter, so you can see the problems getting parts! DSS said that there were not enough sold to warrant anyone making pattern calipers, they'd never recoup the set up costs, never mind make a profit! Sadly the same is true for most F1 specific parts, fuel tank exhaust etc :(. So switching to a more common caliper setup should make sense long term!

Bryanj:
If the caliper arm bolts on and clears the disc the caliper itself should be OK.

If you want to refurb the F1 one i can do a bleed nipple repair kit for about £5 and I'm sure Kevin (ttr400)  could turn you a phenolic piston if you have the sizes. OK you are stuck with the Honda seal and i know its dearer but you dont need them that often---even less with a phenolic piston

mickwinf:
Bryan how does your bleed nipple repair work, i have a caliper with a bleed nipple that has sheared off, could this be fixed?

mick:
Same here i have a F1 caliper the nipple sheared off and i attempted to drill it out  :-[, now it needs another type of fixing  ::), which i have seen on the net  ;),

Hairygit i have fitted an earlier style caliper ffom a k series 750 onto my F1 arm,

only thing i had to do was file the top of the caliper to match the profile of the arm as it stood proud, cheers Mick.

hairygit:
Mick, I had a feeling the earlier K caliper would fit, but they seem to fetch silly money now, that's why I thought of the 400/4, 500/4 or 550/4 caliper, it looks the same as the original F1 caliper, and  complete pattern calipers are easily sourced ;D

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