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Author Topic: 1981 CB650z new engine. What will fit?  (Read 1041 times)

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Offline boiev

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1981 CB650z new engine. What will fit?
« on: July 02, 2017, 05:50:16 AM »
Hello, guys! My cb650's engine is dead: camshaft had no oil because part of thread get into right oil can and camshaft was scratched. Also top and bottom aluminium parts has been damaget. In Ukraine no parts for so old engine. American parts is expensive and has no reason because its years.
My question: what new engine will fit to my cb650s frame? My mechanic advises me to find a new 90-2000s complete engine because its not so old. can you help me please?
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Offline SOHC4 Cafe Racer Fan

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Re: 1981 CB650z new engine. What will fit?
« Reply #1 on: July 02, 2017, 10:51:22 AM »
Quote from: boiev on July 02, 2017, 05:50:16 AM
Hello, guys! My cb650's engine is dead: camshaft had no oil because part of thread get into right oil can and camshaft was scratched. Also top and bottom aluminium parts has been damaget. In Ukraine no parts for so old engine. American parts is expensive and has no reason because its years.
My question: what new engine will fit to my cb650s frame? My mechanic advises me to find a new 90-2000s complete engine because its not so old. can you help me please?

All Honda CB500 models, all Honda CB550 models (1975-78), Honda CB650 (1979-82)
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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 TwoTired

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Re: 1981 CB650z new engine. What will fit?
« Reply #2 on: July 02, 2017, 01:41:21 PM »
Um...I think he wants a more modern engine to put in it.

I can't help with that, though.

I think it's going to be trial and error.

What engines are available at the salvage yards there?
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Lloyd... (SOHC4 #11 Original Mail List)
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Offline 754

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Re: 1981 CB650z new engine. What will fit?
« Reply #3 on: July 02, 2017, 02:03:08 PM »
 First of all , to fit another engine, it must be very similar.
 The honda 500/550/650. The cylinders are straight up.. So a newer motor with slanted forward cylinders is never going to fit.
 Keep that in mind..
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Offline boiev

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Re: 1981 CB650z new engine. What will fit?
« Reply #4 on: July 03, 2017, 12:31:00 AM »
thank you! yes, this will fit by default. But I want to know maybe somebody saw very similar modern engine.
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Offline boiev

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Re: 1981 CB650z new engine. What will fit?
« Reply #5 on: July 03, 2017, 01:06:57 AM »
i'm asking exactly about it. maybe somebody knows)
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Offline SOHC4 Cafe Racer Fan

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Re: 1981 CB650z new engine. What will fit?
« Reply #6 on: July 03, 2017, 05:02:53 PM »
This is not a direct drop in -- will require new mounts -- but a Kawasaki EX500 will fit.
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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 boiev

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Re: 1981 CB650z new engine. What will fit?
« Reply #7 on: July 04, 2017, 11:29:31 AM »

which of years?
Quote from: SOHC4 Cafe Racer Fan on July 03, 2017, 05:02:53 PM
This is not a direct drop in -- will require new mounts -- but a Kawasaki EX500 will fit.
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Offline SOHC4 Cafe Racer Fan

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Re: 1981 CB650z new engine. What will fit?
« Reply #8 on: July 04, 2017, 08:47:00 PM »
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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
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