Author Topic: Double Disk,what year? (Read 4749 times)

Cabilao · « **on:** October 14, 2012, 07:00:34 am »

I have double disk brakes on my 77K(P7). What year they start delivering K bikes with this brakes?
Never see a picture of a 77 with double disks. Maybe they give it first to the Cops?
Hope someone can help?

hondaface75 · « **Reply #1 on:** October 14, 2012, 07:16:06 am »

Look like Goldwing disks. Not stock for a 77k. Clean install though.

JohnG · « **Reply #2 on:** October 14, 2012, 07:53:22 am »

77 and 78 K models came with a single disk, caliper in front of the leg I believe.

I agree that it looks like Gold Wing assembly. Should have superb stopping power!

Grabcon · « **Reply #3 on:** October 14, 2012, 09:24:35 am »

The front legs and calipers look like a DOHC 750 F. Those bikes came with the comstar wheels, not spokes. Just out of curiosity how many bolts are holding the rotors to the hub? 5 or 6.

754 · « **Reply #4 on:** October 14, 2012, 09:35:25 am »

Yeah, I would have said F front end, but was wondering about the hub. They did make a 5 bolt wire hub on one year of 750 A..

Cabilao · « **Reply #5 on:** October 14, 2012, 07:19:25 pm »

Its a 5 bolt hub. And i guess its original from honda because in the brochure for police bikes you can see the double disk. And this rail guards in the front and back. Looks exactly like mine. But in 77 they dont deliver P bikes,only 76 and 78. So mine should be 78. My Frame and engine number says 77. Mysterious bike. I found out that there was two kinds in 1978,P and P2.
getting confused now,hehe.

Don R · « **Reply #6 on:** October 14, 2012, 07:30:41 pm »

Does it have aluminum rims?

seanbarney41 · « **Reply #7 on:** October 14, 2012, 08:17:12 pm »

look at that front fender...looks just like a GL1000...Cabilao, can you measure the thickness of your fork tubes? Are they 37mm or 35mm? Also, how about some pics of your top triple...if my hunch is right, Honda was doing the Gl1000 front end swap on these police bikes before anybody here thought of it

phil71 · « **Reply #8 on:** October 14, 2012, 09:42:40 pm »

I could be wrong, but those fork lowers are from an F with mags.. The rotors look like yhey are too, but they shouldnt fit.

singedebile · « **Reply #9 on:** October 14, 2012, 10:58:08 pm »

look like steel rims to me

Harsh · « **Reply #10 on:** October 15, 2012, 04:52:07 am »

They don't look like GL legs to me. It is hard to tell, but it looks like there are only two bolts that hold the bottom fork caps on, GL's have 4. The rotors don't look like GL rotors. The bolt that the axle screws into doesn't have a hex nut on the end and the mounting bolts are not correct for a GL.

750K · « **Reply #11 on:** October 15, 2012, 09:31:59 am »

One of these is for sale locally, a 78. Has what looks to be the same fork and dual disc set up.

http://vancouver.en.craigslist.ca/van/mcy/3329930273.html

seanbarney41 · « **Reply #12 on:** October 15, 2012, 12:18:48 pm »

those sure do look like the old ugly handle bar riser/clamps from a gl in that craigslist pic

Rigid · « **Reply #13 on:** October 15, 2012, 12:28:50 pm »

Looks like early GW top tree, F model lowers with dual discs and yet a spoke wheel. One weird setup. The forks look thinner than GW forks which makes sense with the F lowers but who knows? Love the bike.

754 · « **Reply #14 on:** October 15, 2012, 05:36:15 pm »

Remember the hub was probably first offered as an Automatic part, not sure of the year..

Cabilao · « **Reply #15 on:** October 15, 2012, 08:40:32 pm »

The rims are steel,fork is 35mm,only 2 bolts on lower fork cap.

Xnavylfr · « **Reply #16 on:** October 16, 2012, 01:57:27 pm »

I don't know what year goldwings you guys are looking at but I just went out and checked a 75 and 76 and they both have front calipers that mount with 2 bolts with 4 and 3/8 on center. But that top tree looks like those ugly things they put on GLs. Since this is a P model, they could have done all kinds of mix and match just to think it will make it better.
Gl lower legs machined to fit 35mm tubes + Trip Trees machined to fit..

Are the the tubes wider apart than the 750 by about 3"

If so then it's really mixed , they used the width of the GL and the tube size of the 750= 35mm
vice 37mm

Xnavylfr(CHUCK)

Harsh · « **Reply #17 on:** October 16, 2012, 02:20:21 pm »

The 4 bolts I referenced were not how the calipers mounted, but how the bottom fork caps mounted. My 75 GL1000 has 4 bolts.

Cabilao · « **Reply #18 on:** October 17, 2012, 02:31:41 am »

After i check the CSMNL parts fiche i think its a front end from a 750 KZ,european model from 79.Looks exactly the same,spoke wheels,5 bolts,same caliper.Only the triple tree is not the same.
Guess only Honda San knows the secret.

Xnavylfr · « **Reply #19 on:** October 17, 2012, 11:16:05 am »

You got better eyes than I do . cause I couldn't notice the bolts on the bottom of the fork tubes.. MISCOMMUNICATION!

Xnavylfr(CHUCK)

SoyBoySigh · « **Reply #20 on:** July 02, 2017, 04:47:33 am »

Bump!!!

Okay - So yeah, I already KNOW the answer to this one - the CB750P7 Canadian-spec & possibly/likely Filipino-spec or "General-Export" spec, DUAL-DISC FIVE-BOLT 40-SPOKE WIRE-HUB which I'm lusting & lusting & lusting after.

The mystery which appears in THIS thread, is what 754 sez about the Hondamatic:

Quote from: 754 on October 14, 2012, 09:35:25 am

Yeah, I would have said F front end, but was wondering about the hub. They did make a 5 bolt wire hub on one year of 750 A..

Was this actually the case? Was there some special instance of Hondamatic which used the same or a similar hub? Could it have been the '79 CB750K SINGLE-disc front hub, with only the one rotor? Perhaps only a 276mm disc, or 296mm 5-bolt hub?

IF there's some special instance wherein "we'd" (I'D - me first!) FIND one such a DUAL-DISC 5-BOLT 40-SPOKE WIRE HUB???

I'm well aware of the Hondamatic with the COMSTAR and the 296mm single disc which is essentially the same old 6-bolt 9-rivet rotor except for the lack of that sixth bolt, and of course the smaller central 'boss' hole. But yeah, these special Hondamatic rotors - Heck, THIS is why I'm so ready to jump headlong into this 5-bolt wheel option, is 'cause I know I could have ALL of the different rotor options - Well, technically yes even the GL1000/CB550 276mm version of the 6-bolt 9-rivet discs. And then the DREAM-BIKE rotors I wanna make from CB1100F/CX500T/CX650T 276mm rotors embiggened to 296mm with Cast-Iron outer rings AND/OR the replica CB1100RB dished one-piece dished 296mm rotors -

(((And to top it all off I'd wanna modify a pair of REAR calipers to go up front, the first-year '75 GL1000 & CB750F1 opposed-piston calipers with the cast-in hanger arm - to bolt up to either standard 'F-type 276mm caliper hangers with enough 'meat' left on 'em for 296mm discs - this way perhaps we could even utilize the '81-'82 CBX / '81 CB1100RB caliper hangers which are already 296mm so as to render 'em effective for 316mm discs (just like the '96+ ST1100-ABS 43mm 1/2-TRAC fork had, or the single front disc on the 'Seven-Fifty' Nighthawk etc?) - Maybe they'd also bolt up to the TRAC caliper hangers on the 41mm TRAC forks of GL1200 or GL1500 maybe both even?)))

I'm gonna get hunting, of course! It's only one MORE endless fruitless parts search - What's the difference when I'm already looking for so much other crap?

"SEEK, and Ye shall FIND" I always say. Though what I MEAN by it, is that you've gotta search for something ELSE, and thereby happen upon the other thing entirely by accident. Seems to work all the time.

The really creepy thing though, that'll really put a spin on your head - Is ... Why do we always find things in the last place we look?

Spooky.

-Sigh.

PetesPonies · « **Reply #21 on:** July 02, 2017, 07:36:04 pm »

The OP's bike . . doesn't look like '77/'8 F lowers, because there is no place for a fender stay to bolt on the lower leg. The OP's lower leg has a place for the fender stay.

SoyBoySigh · « **Reply #22 on:** February 08, 2018, 04:53:36 am »

BUMP!!!

The fender stay isn't attached to the fork on Cabilao's '77 "CB750P7-ii" (CMSNL lists it as such) so those very likely ARE the regular CB750F2 35mm forks. Look closely. It's a bent piece of sheet-metal, clamped down by the axle-clamp bolts. Surely a very very rare SOHC-4 component, possibly only used on CB750P7 & CB750P7-ii, but nevertheless far far easier to replicate than an entirely unique lower fork casting!

Cabilao - if you'll ever consider selling the hub, please keep me in mind! I'd like to get a casting from it and have a whole batch of 'em made up so everybody can enjoy 'em.

It promises to reduce hub mass by up to 50% and the rotor mounting hardware by 75%-ish, just looking at the size & shape of everything that's MY conservative estimate. And given the '78 CB750A Hondamatic rotors are the conventional CB750K0-'K6 9-rivet conventional design, this means the two together would give the conventional CR750 appearance - WITH the aforementioned reduction to un-sprung mass! Don't you think THAT would popularize the notion? Between that, and all of the OTHER applications for this hub, I should think a casting would be warranted.

Oh, and hey - if that lower fender stay ever comes off? Ya'll should measure it up and draw a diagram, just so the other CB750P7 folks can figure out how to make a proper replica of 'em. Just sayin'.

-Sigh.

seanbarney41 · « **Reply #23 on:** February 08, 2018, 06:10:38 am »

So boy, the problem your having finding these is because there is no evidence that the 750p was ever sold in the u.s. seems Honda mainly targeted these to the third world, and maybe Canada and Australia...really don't know.

seanbarney41 · « **Reply #24 on:** February 08, 2018, 06:12:31 am »

Maybe ease up on the spoke obsession. Cast wheels are just better anyway.

News:

Author Topic: Double Disk,what year? (Read 4749 times)