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Author Topic: 1975 CB550 - back to the front burner after 5+yrs  (Read 15633 times)

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Offline SOHC4 Cafe Racer Fan

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #50 on: February 13, 2017, 01:03:10 PM »
Quote from: sinister902 on February 13, 2017, 12:06:58 PM
Well, small change of plans. Ran across a cool vintage speed part and decided with all the new tech I'm throwing at this bike it needs a link to the past so I snatched up an NOS yoshimure 122-00 camshaft for this!



That's pretty rare.  Every once in a while a Yosh 750 camshaft will surface, but I haven't seen any for 550s.
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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: 1975 CB550 - back to the front burner after 5+yrs
« Reply #51 on: February 13, 2017, 01:03:47 PM »
Does it require hardweld rockers or will stock ones suffice?
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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 sinister902

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #52 on: February 13, 2017, 01:25:31 PM »
Quote from: CB750 Cafe Racer Fan on February 13, 2017, 01:03:47 PM
Does it require hardweld rockers or will stock ones suffice?

judging by what information lurks in the past of SOHC4.net it appears these were cut from OEM honda blanks then sent back to honda for the heat treat, so dont REQUIRE hardweld rockers. I'm probably going to have the rockers and the cam coated with anti friction, though.
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Offline SOHC4 Cafe Racer Fan

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #53 on: February 13, 2017, 02:01:14 PM »
Quote from: sinister902 on February 13, 2017, 01:25:31 PM
Quote from: CB750 Cafe Racer Fan on February 13, 2017, 01:03:47 PM
Does it require hardweld rockers or will stock ones suffice?

judging by what information lurks in the past of SOHC4.net it appears these were cut from OEM honda blanks then sent back to honda for the heat treat, so dont REQUIRE hardweld rockers. I'm probably going to have the rockers and the cam coated with anti friction, though.

Nice find.
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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 Camrector

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #54 on: February 13, 2017, 04:00:53 PM »
 No credit Nick!!! Your welcome! ;D :D ;D
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Offline Camrector

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #55 on: February 13, 2017, 04:02:51 PM »
I snatched the other one up Don!
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Offline SF

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #56 on: February 13, 2017, 04:07:58 PM »
What would it be compared to from web? Or....


Sent from my iPhone using Tapatalk
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92 wr250 sold
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73 cb350 twin
75 cb550f
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Offline SOHC4 Cafe Racer Fan

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #57 on: February 13, 2017, 04:11:17 PM »
Quote from: SF on February 13, 2017, 04:07:58 PM
What would it be compared to from web? Or....


Sent from my iPhone using Tapatalk

Isn't the Yosh 122-00 similar to the Megacycle 126-00??
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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 Camrector

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #58 on: February 13, 2017, 04:35:07 PM »
Almost identical to the 126-20. TT Isle of Man cam.
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Offline bambuhiphop

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #59 on: February 13, 2017, 08:05:30 PM »
Quote from: CB750 Cafe Racer Fan on February 13, 2017, 01:03:10 PM
Quote from: sinister902 on February 13, 2017, 12:06:58 PM
Well, small change of plans. Ran across a cool vintage speed part and decided with all the new tech I'm throwing at this bike it needs a link to the past so I snatched up an NOS yoshimure 122-00 camshaft for this!



That's pretty rare.  Every once in a while a Yosh 750 camshaft will surface, but I haven't seen any for 550s.

Ya, super rare. 2nd one (Mine is the first) that I have seen in 5 years.
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75' CB550K -- Still in pieces but it rolls again!!!!

Offline sinister902

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #60 on: February 14, 2017, 05:16:33 AM »
I think this ebay seller is trickling them out one at a time and must have a few.....I asked him if he had more and his response was "why would you need two?" probably lists one at a time to keep the price up.
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Offline Camrector

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #61 on: February 14, 2017, 06:28:29 AM »
He had three and now 0.
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Offline sinister902

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #62 on: February 14, 2017, 08:36:17 AM »
Some rushed crappy sketches and maths for flywheel comparo

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Offline SOHC4 Cafe Racer Fan

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #63 on: February 14, 2017, 08:43:59 AM »
Quote from: sinister902 on February 14, 2017, 08:36:17 AM
Some rushed crappy sketches and maths for flywheel comparo



Who says high school geometry doesn't come in handy.
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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: 1975 CB550 - back to the front burner after 5+yrs
« Reply #64 on: February 14, 2017, 08:47:12 AM »
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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: 1975 CB550 - back to the front burner after 5+yrs
« Reply #65 on: February 14, 2017, 09:10:30 AM »
Pretty cool history, Ole Pops was the man. Too bad they're not the longer version.
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Offline SOHC4 Cafe Racer Fan

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #66 on: February 14, 2017, 09:27:00 AM »
Quote from: bwaller on February 14, 2017, 09:10:30 AM
Pretty cool history, Ole Pops was the man. Too bad they're not the longer version.

Indeed, but MAGNESIUM for 1973.  Pretty trick!
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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 sinister902

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #67 on: February 15, 2017, 06:32:29 AM »
Ok, long story short, I don't think the R6 flywheel/stator will be the answer.....





and, according to all of my measurements the tapers are not the same. although an adapter COULD be made, I still don't think it'll be possible to get the flywheel to fit into the cb650 cover.

I drew the adapter up anyway, would look like this:



autocad calculated angle of taper is 5.4 degrees for cb650, 1.57 degrees for R6. I assume with margin of error in my quick measuring that its more like 6* and 2*. I'd have to cut both in half to get accurate measurements using tools I have at hand, which I probably won't do.

Looks like I'll look into the VFR parts, or maybe cbr600rr parts to see if honda used the same taper that new.
« Last Edit: February 15, 2017, 06:37:25 AM by sinister902 »
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Offline GV1390

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #68 on: February 15, 2017, 07:11:30 AM »
That surely is a nice 650 cover! :)
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93' GSX-R1100, 78' CB550, 71' CL350, 71’ CB500 & 02' ZRX1200R.

Offline sinister902

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #69 on: February 21, 2017, 02:27:16 PM »


whammy. My camshaft came in.
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Offline SOHC4 Cafe Racer Fan

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #70 on: February 21, 2017, 02:34:51 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

Offline Camrector

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #71 on: February 21, 2017, 02:37:38 PM »
Yup Nick grabbed the last one after me Don.
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Offline SOHC4 Cafe Racer Fan

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #72 on: February 21, 2017, 02:54:05 PM »
Question: How fast can I go?

Response: How much do you want to spend?
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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 sinister902

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #73 on: February 22, 2017, 05:01:53 AM »
Quote from: calj737 on February 21, 2017, 03:50:40 PM
Nick: Have you given any thought to having the journals treated with a DFL?

that is the plan, just have to find somewhere to do it. I want the rockers done too.
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Offline RAFster122s

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Re: 1975 CB550 - back to the front burner after 5+yrs
« Reply #74 on: February 24, 2017, 12:17:04 AM »
Is the problem with the tapered cone being too thin at one end or just too difficult to grind to interference fit with a knife edge on the part. If it is heat treated it is going to be resisting suffering from a crack once the flywheel is fitted. It would crack unless hit sharply/dropped from height until forced beyond where it need to seat, right. ?  Why do you feel it is unsuitable?
A little dry ice packed around the end of crank for few minutes for last few minutes the tapered sleeve is heated in the oven. Pull off dry ice, retrieve part from oven  with heavy gloves and  rags that won't burst into flames or melt, pickup and transfer the cone to the crank and give it a few light taps to seat it on the crank. A line with scribed marks with machinist's dye helps you know it is seated to the depth required. Right?  Only risk is part might crack if too hot and if crank is very cold, due to thermal shock.
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David- back in the desert SW!
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