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Author Topic: 650 clutch springs  (Read 844 times)

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Offline bwaller

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650 clutch springs
« on: June 14, 2019, 04:10:49 PM »
Hi guys. I'm looking for some first hand knowledge about CB650 clutch springs. I believe they were originally different than their 550 counterparts, but now every parts manual I can find lists both are 22401-374-000.

Can anyone confirm one way or the other?
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Offline SOHC4 Cafe Racer Fan

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Re: 650 clutch springs
« Reply #1 on: June 14, 2019, 08:47:28 PM »
Dave Barbier just had his apart.  I believe he said they were identical parts.
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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 bwaller

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Re: 650 clutch springs
« Reply #2 on: June 16, 2019, 04:05:59 AM »
Thanks Don. There are some subtle differences from the 550 that probably should require a longer spring. Bla bla bla!!!
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Offline PeWe

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Re: 650 clutch springs
« Reply #3 on: June 16, 2019, 06:33:25 AM »
My K6 has Barnett clutch springs for CB550 which are stiffer than their CB750 version. Dynoman sell them for big bore high torque CB750.
Many springs are useful ;)

CB550 springs have a long list of other bikes they fit.
« Last Edit: June 16, 2019, 06:37:11 AM by PeWe »
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967
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