Author Topic: 1975 Supersport, performance cafe  (Read 121824 times)

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Offline Doctor_D

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Re: Hot Street 1975 CB750F
« Reply #75 on: May 30, 2010, 12:28:09 PM »
Your gaiters, do you need something made to hold up gaiter ends? If it can be 1 piece, i.e., must be slipped over fork-tube, price will be lower..

Either I need something to fill the gap, or I need Norton/Triumph style gaiters that fit snug to the stanchion.

Do you have an idea for a one piece bush?  Perhaps something that uses a set-screw or two to hold it in place?

You've got my attention, depending on the price of course...  ;)
Take care,
David
___________________________________________
1975 CB 750F - Project page: http://forums.sohc4.net/index.php?topic=66026.msg725479#msg725479
1978 CX500
1971 Norton Commando

Offline 754

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Re: Hot Street 1975 CB750F
« Reply #76 on: May 30, 2010, 07:50:12 PM »
 ! pce with single padded setscrew, will be cheapest, splitting them, raises the cost.
 I will take a look at it tommorrow and  measure it up.

 I am north east & across the border from you, if I keep them thin I can ship by cheap mail..
 One pce construction, aluminum.. maybe in the 40.00 range, or less if I made a bunch..

 Will try to have more info Mon nite,,
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline Doctor_D

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Re: Hot Street 1975 CB750F
« Reply #77 on: June 06, 2010, 10:12:29 AM »
Well, drilled the rotors yesterday.



If you've never done it, it's incredibly tedious.  I used an enormous amount of cutting fluid and made it through with just one $10 cobalt steel bit.

They're off to Seattle Brake & Clutch tomorrow to be skimmed to 6mm thickness, then I'll chamfer the holes and they're done. I'm told that they should be about a pound and a half lighter when finished.

Also, just got my HD primary chain from CCC: http://www.classiccyclecity.com/gallery/thumbnails.php?album=48 and braided stainless oil-tank lines: http://www.classiccyclecity.com/gallery/displayimage.php?album=60&pos=0
« Last Edit: August 21, 2012, 09:08:53 PM by Doctor_D »
Take care,
David
___________________________________________
1975 CB 750F - Project page: http://forums.sohc4.net/index.php?topic=66026.msg725479#msg725479
1978 CX500
1971 Norton Commando

Offline Industrial Rat400f Killer

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Re: Hot Street 1975 CB750F
« Reply #78 on: June 06, 2010, 10:21:05 AM »
I think I might drop one of my rotors off to be resurfaced. Thanks for posting where you're getting things done. I'm relatively new to motorcycle customizing and don't have a very large surplus of local shops.
G

Offline sangyo soichiro

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Re: Hot Street 1975 CB750F
« Reply #79 on: June 06, 2010, 11:07:13 AM »
I decided to use this guy for my discs.  He drills, resurfaces, and paints them. 
http://forums.sohc4.net/index.php?topic=67540.0

I'll echo what Rat400F said: Thanks for the links to your suppliers.
1974 CB 750
1972 CB 750 http://forums.sohc4.net/index.php/topic,57974.0.html
1971 CL 350 Scrambler
1966 Black Bomber
Too many others to name…
My cross country trip: http://forums.sohc4.net/index.php/topic,138625.0.html

Offline Industrial Rat400f Killer

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Re: Hot Street 1975 CB750F
« Reply #80 on: June 06, 2010, 11:10:48 AM »
I decided to use this guy for my discs.  He drills, resurfaces, and paints them. 
http://forums.sohc4.net/index.php?topic=67540.0

I was going to send it out to him but I'd rather do business with locals.

Offline tweakin

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Re: Hot Street 1975 CB750F
« Reply #81 on: June 06, 2010, 11:52:29 AM »
Top notch is par for the course on your builds.  I hope to see this one in person once it is completed.

Thanks for the links.
Tige

Offline Doctor_D

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Re: Hot Street 1975 CB750F
« Reply #82 on: June 06, 2010, 02:34:40 PM »
Soichiro - I was going to use Speedracer741 as well, but decided that it was something I should be able to do myself (mostly anyway).

Rat400F - Seattle Brake is THE place, and they won't turn their nose up at stainless steel like most will.

Tweakin - Soon as it's on the road, I'd be happy to detour a bit and cruise down your way. No guarantees that it'll be anything special compared to a lot of bikes on these boards, but I'm happy to share the enthusiasm.

On another topic, seems I've got a damaged clutch-center.



A small dent left a high-spot. New one's are $115, and there's no way I'd buy a used one that I couldn't inspect personally.

What do folks think?  Get a new one, or file/sand the high-spot off?
« Last Edit: August 21, 2012, 09:10:30 PM by Doctor_D »
Take care,
David
___________________________________________
1975 CB 750F - Project page: http://forums.sohc4.net/index.php?topic=66026.msg725479#msg725479
1978 CX500
1971 Norton Commando

Offline tweakin

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Re: Hot Street 1975 CB750F
« Reply #83 on: June 06, 2010, 08:01:54 PM »
Cool, but I can also make it up your way.  I would love to see your Norton also ;D.  Maybe once we get the builds done we can do a little PNW(seattle) meet up?  As far as the clutch basket, your build is so pristine I would go for a new one.  I am a bit obsessive and usually replace before I fix and sell the old parts, but thats just me. 

I can't believe I wasted so much time building Harley's before I figured out how much more fun the old bikes were, but I am not getting rid of my Harley...

Offline 754

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Re: Hot Street 1975 CB750F
« Reply #84 on: June 06, 2010, 09:43:41 PM »
 Because your clutch part already looks like its been run... file it flat and run it.. be better than it was...

 Do you need gaiter adaptors..?
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline Doctor_D

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Re: Hot Street 1975 CB750F
« Reply #85 on: June 07, 2010, 06:22:35 AM »
Do you need gaiter adaptors..?

Sure.  What did you come up with?
Take care,
David
___________________________________________
1975 CB 750F - Project page: http://forums.sohc4.net/index.php?topic=66026.msg725479#msg725479
1978 CX500
1971 Norton Commando

Offline 754

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Re: Hot Street 1975 CB750F
« Reply #86 on: June 07, 2010, 08:17:31 AM »
2 aluminum collars, that must be installed before fork is slid into trees.
 Groove on the collar locates top of gaiter, and a setscrew holds it in place..

  40 bux per pair shipped.. at most.. if it goes well maybe a bit less.
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline Doctor_D

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Re: Hot Street 1975 CB750F
« Reply #87 on: June 07, 2010, 01:25:03 PM »
I'll take 'em.  PM'd you with my address.
Take care,
David
___________________________________________
1975 CB 750F - Project page: http://forums.sohc4.net/index.php?topic=66026.msg725479#msg725479
1978 CX500
1971 Norton Commando

Offline Doctor_D

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Re: Hot Street 1975 CB750F
« Reply #88 on: June 20, 2010, 06:56:53 AM »
Just a few bits to go and we can start assembling the engine.

Waiting on APE crank studs, which should ship late next week and my heavy-duty cam chain and M3 tensioner (KOS, race season can wait -- I need that tensioner  ;) ).

In the meantime, wheels are done. Sun rims, Buchanan's stainless spokes.  Great work from them, as usual. Other than that, just new SKF sealed bearings and seals.



Rotors were skimmed to minimum thickness and are much lighter than they were before drilling and skimming.





Though they look better with a little wire-wheel action, I'm leaning toward replacing the rotor nuts with stainless.  The chain tensioners will also likely be binned and replaced with an alloy pair like Rob's at Voxonda.  Finally, I'm giving thought to having some axles made from gun-drilled 4130, but they're easy enough to attend to later in the project.

Next up, tires and tubes.  The set of Avon Roadriders that came off the bike were almost brand new and will be reinstalled in a day or so.  After that we'll mock up the frame with a spare motor to get the rearset brackets positioned and route the exhaust.  From there, the frame, swingarm and pipes are off to the coaters/platers.  Once back, the assembly work can begin in earnest. Best guess is 3-weeks until we've got a "roller."
« Last Edit: August 21, 2012, 09:15:25 PM by Doctor_D »
Take care,
David
___________________________________________
1975 CB 750F - Project page: http://forums.sohc4.net/index.php?topic=66026.msg725479#msg725479
1978 CX500
1971 Norton Commando

Offline Doctor_D

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Re: Hot Street 1975 CB750F
« Reply #89 on: June 20, 2010, 07:01:47 AM »
Forgot to mention, Frank "754" made me some gaiter retainers (he's got a post with pictures) for using OEM gaiters with non-OEM headlight ears.  They look great and work even better. Two thumbs up.
Take care,
David
___________________________________________
1975 CB 750F - Project page: http://forums.sohc4.net/index.php?topic=66026.msg725479#msg725479
1978 CX500
1971 Norton Commando

traveler

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Re: Hot Street 1975 CB750F
« Reply #90 on: June 20, 2010, 07:50:03 AM »
Really looks nice, Doc.

An old toothbrush and some WD-40 could clean those chain tenshioners up....if you need to save a buck or two.

Are the Sun rims high quality???  I have pondered those for a future 750 build, but not sure.

I'm thinking some GENTLE sanding on the clutch part with some 300 grit paper would be sufficient.

~Joe

Online MRieck

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Re: Hot Street 1975 CB750F
« Reply #91 on: June 20, 2010, 08:02:31 AM »
Really looks nice, Doc.

An old toothbrush and some WD-40 could clean those chain tenshioners up....if you need to save a buck or two.

Are the Sun rims high quality???  I have pondered those for a future 750 build, but not sure.

I'm thinking some GENTLE sanding on the clutch part with some 300 grit paper would be sufficient.

~Joe

I was told they are the strongest aluminum rim available. I have run them for years.
Owner of the "Million Dollar CB"

traveler

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Re: Hot Street 1975 CB750F
« Reply #92 on: June 20, 2010, 08:03:23 AM »
Good to know!  Thanks.  Hopefully, that will encourage Doc then!

~Joe

Offline Doctor_D

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Re: Hot Street 1975 CB750F
« Reply #93 on: June 20, 2010, 08:28:37 AM »
I've got Sun rims on another bike.  They've handled track days and spirited riding for a few years now without complaint, so I'm pretty confident they'll work for this project.
Take care,
David
___________________________________________
1975 CB 750F - Project page: http://forums.sohc4.net/index.php?topic=66026.msg725479#msg725479
1978 CX500
1971 Norton Commando

Offline KB02

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Re: Hot Street 1975 CB750F
« Reply #94 on: June 21, 2010, 04:05:07 AM »


Those disks are so pretty, it's almost a shame to have to use them. (but please do use them, it's for your own safety  ;) )
1978 CB750K Project
2000 Ducati ST2
...and a pedal bike

Join the AMA today!!

My project thread Part I: K8 Project "Parts Bike"
My project thread Part II: Finishing (yeah, right) touches on Project "Parts Bike"

Offline sangyo soichiro

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Re: Hot Street 1975 CB750F
« Reply #95 on: June 21, 2010, 08:42:00 AM »
I'm using Sun rims also.  No complaints here.
1974 CB 750
1972 CB 750 http://forums.sohc4.net/index.php/topic,57974.0.html
1971 CL 350 Scrambler
1966 Black Bomber
Too many others to name…
My cross country trip: http://forums.sohc4.net/index.php/topic,138625.0.html

Offline Doctor_D

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Re: Hot Street 1975 CB750F - fabrication & frustration
« Reply #96 on: June 27, 2010, 09:26:23 AM »
With the tires on the wheels, it was time to mock up the bike for gussets, reaset mounts, and exhaust brackets. Had a day's worth of time in the budget for it... I think there's a saying about the best laid plans of mice and men that applies here.



Tower, the taller guy, is doing the welding and fabrication for me.

In goes a dummy engine.





On go spigots and the CR750 replica exhaust. Not a plug and play operation, as we quickly discover.



Something's amiss.  Aren't the outside headers supposed to tuck in?



Hmmm... doesn't look like the race bikes used side stands. Doh!  (The megaphones were OK, but it's all moot -- because it looks like I got two-pair of "inside" headers.)

The choice is to have the megaphone outlets symmetrical, or the header alignment relative to the frame symmetrical.  The former is the obvious choice, but still not so easy.  But we're stalled and frustrated by the apparent parts mix-up.



Spare 750F tank on it to help us place the oil cooler and steering damper -- pics of those brackets later.



Sidestand lug cut off.  The remnants will be ground off later. Who needs a sidestand anyway? I'll just carry a paddock stand around with me. (arghh)  Open to suggestions for keeping the bike upright when not being ridden.



The day's only minor bit of success was finding the most ergonomic placement for rearsets. We got them tacked on about 8pm last night.



We also got the gusset templates designed.  With any luck, that will go quickly on Tuesday.
« Last Edit: August 22, 2012, 07:23:20 AM by Doctor_D »
Take care,
David
___________________________________________
1975 CB 750F - Project page: http://forums.sohc4.net/index.php?topic=66026.msg725479#msg725479
1978 CX500
1971 Norton Commando

Offline KB02

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Re: Hot Street 1975 CB750F
« Reply #97 on: June 28, 2010, 03:33:57 AM »
Did you double check the rearset placement with the pipes in place? Looks pretty close.
1978 CB750K Project
2000 Ducati ST2
...and a pedal bike

Join the AMA today!!

My project thread Part I: K8 Project "Parts Bike"
My project thread Part II: Finishing (yeah, right) touches on Project "Parts Bike"

Offline bwaller

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Re: Hot Street 1975 CB750F
« Reply #98 on: June 28, 2010, 05:45:07 AM »
I imagine you'll see from napoleanb's pics in the HiPo forum the way those pipes need to be set-up. You'll have no ground clearance as is.

Offline Doctor_D

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Re: Hot Street 1975 CB750F
« Reply #99 on: June 28, 2010, 05:57:18 AM »
Did you double check the rearset placement with the pipes in place? Looks pretty close.

Yes, we did. There's an inch between the top meg and the footpeg at that point.
Take care,
David
___________________________________________
1975 CB 750F - Project page: http://forums.sohc4.net/index.php?topic=66026.msg725479#msg725479
1978 CX500
1971 Norton Commando