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Author Topic: 73 CB750  (Read 5047 times)

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Offline Gizmo

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Re: 73 CB750
« Reply #25 on: April 04, 2015, 10:21:16 pm »
#2
« Last Edit: April 17, 2018, 03:02:59 pm by Glenn Stauffer »
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Offline Gizmo

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Re: 73 CB750
« Reply #26 on: April 04, 2015, 10:26:07 pm »
#3
« Last Edit: April 17, 2018, 03:04:03 pm by Glenn Stauffer »
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Offline Gizmo

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Re: 73 CB750
« Reply #27 on: April 04, 2015, 10:27:02 pm »
4
« Last Edit: April 17, 2018, 03:04:58 pm by Glenn Stauffer »
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Offline SOHC4 Cafe Racer Fan

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Re: 73 CB750
« Reply #28 on: April 05, 2015, 11:09:04 am »
The motor looks clean, Gizmo.  Nice paint job.
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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 Gizmo

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Re: 73 CB750
« Reply #29 on: April 05, 2015, 04:32:15 pm »
Thanks very much! i like how it turned out too.
« Last Edit: April 17, 2018, 03:05:52 pm by Glenn Stauffer »
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Offline Trad

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Re: 73 CB750
« Reply #30 on: April 05, 2015, 04:34:39 pm »
Could eat off that thing. Looks great.
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74 CB550 Build: NOS-GUTTED-OEMplus-HOLDTRUE
http://forums.sohc4.net/index.php/topic,130575.0.html

Offline calj737

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Re: 73 CB750
« Reply #31 on: April 05, 2015, 04:42:17 pm »
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'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline Bigsam302

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    • 1976 CB750F (915cc) Super Sport
Re: 73 CB750
« Reply #32 on: April 05, 2015, 06:01:51 pm »
It looks really good.  That's the same paint scheme that I am using on my engine!
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1976 CB750F (915cc) Super Sport: http://forums.sohc4.net/index.php?topic=142578.0

Offline Gizmo

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Re: 73 CB750
« Reply #33 on: November 23, 2016, 09:22:28 am »
Visual progress update.
« Last Edit: April 17, 2018, 03:06:32 pm by Glenn Stauffer »
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Offline 70CB750

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Re: 73 CB750
« Reply #34 on: November 23, 2016, 09:26:40 am »
Nice!
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Offline Gizmo

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Re: 73 CB750
« Reply #35 on: November 23, 2016, 09:37:59 am »
So the bike has made its virgin debut on the roads... and it pulls like a freight train! i had an ear to ear grin for days! Now that i've had time to settle down i was hoping i could quiz the gurus on here for some tune up questions;

The bike has been bored out to 836cc with wiseco pistons and cycle X enlarged cast iron sleeves. Likewise i am also running the 4-1 cycle x exhaust, and K&N pod filters.

The carbs i have set at.  130 mains , 40 idles, clip 4th from top (based on a members suggestion on this sight who rides a similar setup at a similar elevation). there are new carb boots, and each received a rebuild ensuring all passages were clear with fresh o-rings.

After a bench adjustment of the carbs and setting the idles at 1 full turn out as per the manual i did a carb synch.

The synch went well, all 4 are pulling within 1/2 cm of one another.

My issue at the moment is that cylinders 1&2 are running excessively rich, where as 3&4 are a perfect tawny colour on the plugs. I've tried leaning out 1 and 2 doing 1/16th turn increments. I ended up leaving them at approximately 1 1/4 turns out on 3 and 4 and 2 full turns out on 1&2. with no noticeable improvement in plug chops.

My temporary riding permit is up for the season and the weather is not conducive to doing anymore road riding this season. Whats the consensus from the seasoned vets here? Where have i goofed up? Do i keep trying to lean out 1&2 or do look for a vacuum leak?

Thanks
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Offline Gizmo

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Re: 73 CB750
« Reply #36 on: November 23, 2016, 09:44:49 am »
more pics
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Offline SOHC4 Cafe Racer Fan

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Re: 73 CB750
« Reply #37 on: November 23, 2016, 09:28:56 pm »
Well done, Gizmo.  What did you decide on for a seat?
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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 Gizmo

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Re: 73 CB750
« Reply #38 on: November 24, 2016, 08:30:34 am »
I don't have a photo of it with the seat on at the moment. To access my electronics i built a a seat pan that hinges away from the frame. I dropped my bike off at a local upholstery shop and let him have at er. My initial reaction was that the seat was thicker than i had envisioned. But after having a few rides on it, i think the comfort more than compensates for it.
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Offline riverfever

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Re: 73 CB750
« Reply #39 on: November 24, 2016, 08:33:43 am »
Wiring looks real tidy.
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http://forums.sohc4.net/index.php?topic=127186.0

"You wouldn't think that out here...a man could simply run clear...out of country but oh my...oh my...nothing but the light." -Ben Nichols

Offline calj737

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Re: 73 CB750
« Reply #40 on: November 24, 2016, 08:57:16 am »
Are those black oxide bolts used for grounding? If they're painted, I'd suggest making sure the ring terminals hit bare steel for the best ground.

Curious why you chose to use only white wire instead of colors to help identify them later within the loom?
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'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline Gizmo

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Re: 73 CB750
« Reply #41 on: November 24, 2016, 10:19:07 am »
They have been cleaned, underneath each ring terminal.

I didn't like the quality of wires that were available at most auto body shops in town. I work as a helicopter mechanic and have available to me aircraft quality wiring so i used that and used the ink stamping tool at work to identify each wire.
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Offline calj737

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Re: 73 CB750
« Reply #42 on: November 24, 2016, 11:37:49 am »
That ought to do it  ;)
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'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis
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