Topic: does the cb750F master cylinder have a larger bore?

[paulages]

i saw someone mention in passing that they had an F master cylinder on their bike because it was made with a larger bore for the supersport dual disk setup. can anyone verify/debunk this? i can't find anything in microfiche (or in a thread search on here) to prove one way or the other, except for a different part #.

i've yet to find a replacement master that i think looks anywhere near as good as these old ones do polished up. my stocker with SS brake lines stops great. if i could keep a genuine SOHC4 master that would push enough fluid for two calipers, i'd be a happy camper.

[eurban]

The stock master cylinder for the dual disc 750F models is most certainly a larger bore than the MC for the K models.  I have one of these guys on my 78K that has a GL1000 dual disc setup on it and it works nicely.  Just remember that you will need the rebuild kit, and lever specific to the F2/F3 models.  I could not locate an aftermarket rebuild kit so I purchased a Honda one thru David Silver's. Beware of  badly corroded parts as they aren't good for anything more than paper weights. Enjoy.

[paulages]

thanks! BTW, does it look the same on the outside?

[eurban]

The alloy bodied master cylinders all look pretty much the same except perhaps the resevoir is a bit bigger on the F2/F3 ones.  It also will have the provision for the brake lite microswitch which is a good bit cleaner looking than the pressure activated lite switches.

[kghost]

sorry don't think so.

Part number for the K and F2 are the same from emgo.

[Steve F]

The MC for the F2 IS larger than the F and F1.

[eurban]

As I said before, the bore size for the master cylinder for the F2/f3 models is larger than the Ks and the F/ F1 for that matter.  The ID's are something like 17mm for the F2/F3s and 14mm for the Ks.  Emgo's listing is in error.