which model 750 has a 295mm front disc

[Ewan 500 K1]

.. and a caliper arm with a 50mm distance between the caliper mounting holes ... like the one in attached picture. Note how the lower edge of the pivot arm sweeps up toward the caliper position and that there is the raised up bit of the casting between the adjuster bolt hole and the bottom edge of the braket .. which are the easily visible differnces with the 500 one in addition to the fact that the caliper mounting holdes are 50mm apart rather than 42mm found on 500/550 s

Theres at least 3 forum members with caliper arms for sale if we can find out which model its for We all have 500/550's and aquired these by mishtake

[MarkCR750]

CB750K7 does, not sure about the earlier ones, I just converted mine to twin disc and had to pay £30 for one of those arms from a breaker.

[Trigger]

Mark, you kept that quite. Are you 100% sure that it is 50mm between the holes?

[Green1]

Both my 750's have a disk size of 295mm and both have a distance of 50mm between the holes.
One bike has the original k1 front end and one has a k2 front end with the same caliper&mount as your pic.

Mick

[Trigger]

Mick, your calipers bolt from the back? On what Mark said and a quick look at the microfiche the arm and caliper in the picture are of the 750K7, K8 and F1. Not sure if the arm is used for all the 750k's   

[Green1]

My k1 one bolts from the back the other from the front
Both arms are different but the holes are the same

Mick

[Ewan 500 K1]

so ... one in the piture is part 45115-392-003. £205 from CMSNL or theres a german one on eabay for £100.   According to OEM it fits all of:
CB750A A (76) MOTORCYCLE, JPN, VIN# CB750A-7000001 TO CB750A-7007331
CB750A A (77) MOTORCYCLE, JPN, VIN# CB750A-7100001 TO CB750A-7110560
CB750A A (78) MOTORCYCLE, JPN, VIN# CB750A-7200001
CB750F A MOTORCYCLE, JPN, VIN# CB750F-1000002 TO CB750F-1015054
CB750F A (76) MOTORCYCLE, JPN, VIN# CB750F-2000003 TO CB750F-2022317
CB750K A (77) MOTORCYCLE, JPN, VIN# CB750-2700009 TO CB750-2729534
CB750K A (78) MOTORCYCLE, JPN, VIN# CB750-2800001

Top Bracket is 45104-405-000.   No sign of any for sale anywhere
Fits : CB750A A (77) MOTORCYCLE, JPN, VIN# CB750A-7100001 TO CB750A-7110560
CB750A A (78) MOTORCYCLE, JPN, VIN# CB750A-7200001
CB750K A (77) MOTORCYCLE, JPN, VIN# CB750-2700009 TO CB750-2729534
CB750K A (78) MOTORCYCLE, JPN, VIN# CB750-2800001

Pin is 45116-367-690, £46 from CMSNL


So about £300 for new ! ... bloody hell. Think I'll frame mine

[Ewan 500 K1]

one here sitting at a tenner

http://www.ebay.co.uk/itm/HONDA-CB750-4-K6-BRAKE-CALIPER-MOUNT-PIVOT-FOR-REFURB-/321396697633?pt=UK_Motorcycle_Parts_13&hash=item4ad4bc6a21

[Trigger]

Well i have one that has been overhauled for a bit more than a tenner

[Ewan 500 K1]

.. and me. .. better not flood the market all at once though eh ?

[Trigger]

Ewan, i can sell you one. Then your have a matching pair

[Ewan 500 K1]

match yer fiver Trig ?

[MarkCR750]

Mark, you kept that quite. Are you 100% sure that it is 50mm between the holes?

I will check in the morning trigger.

[Bitsa (Ralph Wright - RIP)]

Mines the same as Micks 295 and 50
Cheers
Bitsa

[MarkCR750]

Yes 50mm trigger.