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Author Topic: stan's 1977 CB750K  (Read 5869 times)

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Offline stan.

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Re: stan's 1977 CB750K
« Reply #25 on: January 30, 2016, 10:08:16 AM »
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Offline stan.

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Re: stan's 1977 CB750K
« Reply #26 on: January 30, 2016, 10:09:35 AM »
found someone selling a drum / spoke rear wheel for $20 so I think I'm going to try and snag that tomorrow. it's got some surface rust but for $20 who cares
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Offline stan.

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Re: stan's 1977 CB750K
« Reply #27 on: January 30, 2016, 03:44:21 PM »
exhaust installed, carburetors installed and hooked up!
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Offline grcamna2

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Re: stan's 1977 CB750K
« Reply #28 on: January 30, 2016, 05:33:42 PM »
I like your helper there  :D
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75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline stan.

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Re: stan's 1977 CB750K
« Reply #29 on: February 02, 2016, 02:47:29 AM »
today is a big day!  picked up some fuel line, oil, and made an auxiliary fuel bottle from a soda bottle and a brass fitting. jumped the coils up to the points and the battery in order to have ignition, albeit running total loss.  still waiting on my OMP connectors shipment so the construction of a new harness can begin.

succeeded in starting the engine up!  here's a video of the first start it's a little rough and loud as the carbs were open, the 4-1 header is open, and i was winding the engine out to get it started up.  after the video i adjusted the idle screw and warmed the bike up a little, it idles! 

next order of business: a muffler.  that open header is LOUD
« Last Edit: February 02, 2016, 04:28:16 AM by stan. »
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Offline stan.

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Re: stan's 1977 CB750K
« Reply #30 on: February 02, 2016, 02:04:46 PM »
checked the OD of the header's outlet and it's ~2.56".  rang up cone engineering (they're local to me) and asked, their 2.5" is not loose enough tolerance'd to fit onto my bike :(  not sure how to proceed from here.

found all the parts of my stock airbox, but the boots are pretty junky so i was able to place them on just barely.  going to need to track down a filter, and debating whether to buy nice soft new boots.

OMP connectors arrived, will pay a visit to the electronics yard to get wiring and start cracking on the harness build.

i bought a replacement petcock but can't find it anywhere right now.  probably will clean house before spending money on another one.

clutch still seems grabby, might disassemble to take a look at the innards.
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Offline grcamna2

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Re: stan's 1977 CB750K
« Reply #31 on: February 02, 2016, 02:57:55 PM »
I think there's a way to make that 2.5" Cone muffler to fit  ;)
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75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline stan.

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Re: stan's 1977 CB750K
« Reply #32 on: February 02, 2016, 03:35:12 PM »
Quote from: grcamna2 on February 02, 2016, 02:57:55 PM
I think there's a way to make that 2.5" Cone muffler to fit  ;)

i could cut slits to allow it to fit, but i'm nervous about getting a good seal as the slip section terminates into a weld pretty close by.
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Offline mycoal

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Re: stan's 1977 CB750K
« Reply #33 on: February 02, 2016, 03:41:34 PM »
Question for you guys. Why would a drum brake be superior to his rear disc brake?

Also, if that rear disc brake + caliper is for sale I might be interested.
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1978 CB750K with 1977 GL1000 front end

Offline SOHC4 Cafe Racer Fan

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Re: stan's 1977 CB750K
« Reply #34 on: February 02, 2016, 03:44:53 PM »
Quote from: mycoal on February 02, 2016, 03:41:34 PM
Question for you guys. Why would a drum brake be superior to his rear disc brake?

Also, if that rear disc brake + caliper is for sale I might be interested.

It's not superior in terms of performance.  The disc will offer better braking when serviced/rebuilt.  He does not want to fabricate a mount for the brake stabilizer on the swingarm.  His swingarm is set up for a drum and has a different attachment point.
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline stan.

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Re: stan's 1977 CB750K
« Reply #35 on: February 02, 2016, 03:45:04 PM »
Quote from: mycoal on February 02, 2016, 03:41:34 PM

Also, if that rear disc brake + caliper is for sale I might be interested.

it isn't listed, but i do wish to sell it.  shoot me a pm.
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Offline grcamna2

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Re: stan's 1977 CB750K
« Reply #36 on: February 02, 2016, 03:45:32 PM »
Quote from: mycoal on February 02, 2016, 03:41:34 PM
Question for you guys. Why would a drum brake be superior to his rear disc brake?

Also, if that rear disc brake + caliper is for sale I might be interested.

The drum brake is good for riding in wet weather because it's sealed and the 'feel' is consistent;I don't like using rear brakes very much,more of a front brake person.
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75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline SOHC4 Cafe Racer Fan

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Re: stan's 1977 CB750K
« Reply #37 on: February 02, 2016, 03:51:44 PM »
The stock rear drum brake is sufficient for everyday use.  Drum brakes can be more prone to lock-up and offer less braking power than most comparable year discs.  Disc rotors (at least modern one) offer better feel and modulation before locking up.  A twin or quad leading shoe brake, however, will outperform the 750SS brake disc. 

As grcamna2 stated, most of your braking is biased toward the front disc. 

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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline seanbarney41

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Re: stan's 1977 CB750K
« Reply #38 on: February 02, 2016, 03:56:24 PM »
Quote from: mycoal on February 02, 2016, 03:41:34 PM
Question for you guys. Why would a drum brake be superior to his rear disc brake?
an overly powerful rear break can be dangerous when the slightest toe tap results in wheel lockup.  As you probably realize, most are much better at modulating braking force with their hands than their feet, so in a panic situation this can be even worse...added to the fact that in braking weight transfers to the front forks so that front has wayyy more traction than rear.  So, most agree that F0/1 caliper is too powerful but K model drum has less power but is especially unpredictable to modulate, quickly going from no braking force to wheel locked.  I feel like it is a tossup, both rear brakes kinda suck...
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If it works good, it looks good...

Offline grcamna2

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Re: stan's 1977 CB750K
« Reply #39 on: February 02, 2016, 04:05:01 PM »
stan,in a panic stop I'd get my mind to think 'All I have are the front brakes  :o ' ! and then remember to only use 'one toe' on the rear brake pedal.
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75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline stan.

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Re: stan's 1977 CB750K
« Reply #40 on: February 02, 2016, 04:30:13 PM »
Quote from: grcamna2 on February 02, 2016, 04:05:01 PM
stan,in a panic stop I'd get my mind to think 'All I have are the front brakes  :o ' ! and then remember to only use 'one toe' on the rear brake pedal.

yep, all my past bikes have been much more modern (ie 2004 ZX-6R) and even then, back brake is more there for moral support to me. or holding the bike in place while sitting at a light  ;)
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Offline SOHC4 Cafe Racer Fan

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Re: stan's 1977 CB750K
« Reply #41 on: February 02, 2016, 04:51:08 PM »
Quote from: seanbarney41 on February 02, 2016, 03:56:24 PM
Quote from: mycoal on February 02, 2016, 03:41:34 PM
Question for you guys. Why would a drum brake be superior to his rear disc brake?
an overly powerful rear break can be dangerous when the slightest toe tap results in wheel lockup.  As you probably realize, most are much better at modulating braking force with their hands than their feet, so in a panic situation this can be even worse...added to the fact that in braking weight transfers to the front forks so that front has wayyy more traction than rear.  So, most agree that F0/1 caliper is too powerful but K model drum has less power but is especially unpredictable to modulate, quickly going from no braking force to wheel locked.  I feel like it is a tossup, both rear brakes kinda suck...

Well put, SB -- especially the last sentence.
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline stan.

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Re: stan's 1977 CB750K
« Reply #42 on: February 07, 2016, 03:39:45 AM »
picked up a filter for the stock airbox today, started rust treatment on the tank, got replacement rear tank rubber, and got front brake bled and functional. 
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Offline grcamna2

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Re: stan's 1977 CB750K
« Reply #43 on: February 07, 2016, 07:44:26 AM »
How's the tank doing ?
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75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline stan.

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Re: stan's 1977 CB750K
« Reply #44 on: February 07, 2016, 01:09:59 PM »
tons of rust came out.  this time i did a gallon of sulfuric acid drain opener straight into the tank, followed by enough water to fill the tank up.  let it sit for ~15 hours.  dumped out, rinsed over and over until water ran clear (took a while).  this is after my previous treatments a few months back - the works toilet bowl cleaner followed by reverse electrolysis.  the tank was heavily heavily rusted when i got it originally.

at this point i feel like i might be good to go as long as i use an inline filter between the petcock and the carbs.  photos give a pretty good idea of the current state, mostly good clean bare metal but a few stubborn archipelagos of rust on the sides.  not sure if it's necessary to try to bother getting those out.  open to discussion of the merits of continued rust removal efforts or calling this good and running an inline filter.
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Offline toytuff

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Re: stan's 1977 CB750K
« Reply #45 on: February 07, 2016, 01:23:14 PM »
I have several handle bars for that model. One K and two F models which were a little flatter. F model bars are in good nick. K model should clean up nice.

I believe your in Arizona correct? Ill look for a picture if interested.

tt
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Offline stan.

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Re: stan's 1977 CB750K
« Reply #46 on: February 07, 2016, 02:09:10 PM »
Quote from: toytuff on February 07, 2016, 01:23:14 PM
I have several handle bars for that model. One K and two F models which were a little flatter. F model bars are in good nick. K model should clean up nice.

I believe your in Arizona correct? Ill look for a picture if interested.

tt

what are you talking about?   ???
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