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Author Topic: 1985 CB650 carbs on a 1979 CB650?  (Read 2047 times)

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Offline Sinister1

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1985 CB650 carbs on a 1979 CB650?
« on: December 18, 2016, 02:38:26 PM »
I have a freshly rebuilt set of 1985 carburetors from a 1985 CB650. I was wondering if it was possible or worth trying to make these work on a 1979 CB650? I have the original 1979 CB650 carburetors but I've never rebuilt a set before.
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Offline BomberMann650

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Re: 1985 CB650 carbs on a 1979 CB650?
« Reply #1 on: December 18, 2016, 03:14:33 PM »
If the carbs physically fit the intake size and spacing and the jet specs of the 85 are similar to the 79's - it could be worth the experiment - depending.
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Offline 754

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Re: 1985 CB650 carbs on a 1979 CB650?
« Reply #2 on: December 18, 2016, 04:35:30 PM »
At ne point the spacing changed,. Is not 92 last year of the sohc 650 ?
Edit..I meant 82..
« Last Edit: December 19, 2016, 08:31:05 AM by 754 »
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Offline DaveBarbier

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Re: 1985 CB650 carbs on a 1979 CB650?
« Reply #3 on: December 18, 2016, 06:20:09 PM »
Doubt the spacing is the same. Not all SOHC4 650's have same intake spacing.
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Offline SOHC4 Cafe Racer Fan

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Re: 1985 CB650 carbs on a 1979 CB650?
« Reply #4 on: December 18, 2016, 11:25:04 PM »
For a 1979-80 CB650 head, your best bet is using CB750K carburetors.
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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 SOHC4 Cafe Racer Fan

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Re: 1985 CB650 carbs on a 1979 CB650?
« Reply #5 on: December 19, 2016, 09:36:46 AM »
Quote from: calj737 on December 19, 2016, 03:04:40 AM
Quote from: 754 on December 18, 2016, 04:35:30 PM
Is not 92 last year of the sohc 650 ?
It was 1982? The 1985 is a DOHC motor.

Correct-o-mundo.
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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 Sinister1

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Re: 1985 CB650 carbs on a 1979 CB650?
« Reply #6 on: December 23, 2016, 07:29:53 AM »
Looks like I will be attempting to rebuild the original ones then. I've rebuilt carbs for cars but I didn't know if I could transfer that knowledge to a motorcycle.
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Offline SOHC4 Cafe Racer Fan

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Re: 1985 CB650 carbs on a 1979 CB650?
« Reply #7 on: December 23, 2016, 08:01:26 AM »
IF you have the 1979 head, you can use the stockers or 1969-76 CB750 carburetors, too.
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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 cb650

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Re: 1985 CB650 carbs on a 1979 CB650?
« Reply #8 on: December 23, 2016, 02:43:50 PM »
Many years ago Soo's did a thread on all the diff carbs he made fit using diff intakes.
Seemed like a lot of work to get out of work. 
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Offline 754

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Re: 1985 CB650 carbs on a 1979 CB650?
« Reply #9 on: December 23, 2016, 02:52:11 PM »
Wonder what happened to Soo's....lived near Salt Lake City... Had a cobra motor too..
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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
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