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Author Topic: and so it begins, cb550k under the knife  (Read 39052 times)

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Offline SOHC4 Cafe Racer Fan

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Re: and so it begins, cb550k under the knife
« Reply #75 on: March 16, 2015, 04:54:29 PM »
Can you post a photo of where you plan to attach your aluminum mounts to the frame?  They look pretty robust.  Any particular reason to form them at a 90 degree angle?
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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 DMcD

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Re: and so it begins, cb550k under the knife
« Reply #76 on: March 17, 2015, 12:49:13 AM »
I saw that the passenger footrest mounts are at 90 degrees, and it was also the easiest angle for me to replicate accurately.

Mounting to the frame will just be welded on lugs.
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Offline calj737

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Re: and so it begins, cb550k under the knife
« Reply #77 on: March 17, 2015, 05:56:22 AM »
Bolted brackets to welded on lugs, right? Or have you figured out how to weld aluminium to steel while we weren't looking? ::)
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"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 Riceman

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Re: and so it begins, cb550k under the knife
« Reply #78 on: March 17, 2015, 09:07:34 AM »
First I've seen this post,enjoyed reading through it!
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Offline DMcD

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Re: and so it begins, cb550k under the knife
« Reply #79 on: March 17, 2015, 03:16:33 PM »
Quote from: CB750 Cafe Racer Fan on March 16, 2015, 04:54:29 PM
Any particular reason to form them at a 90 degree angle?

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Offline calj737

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Re: and so it begins, cb550k under the knife
« Reply #80 on: March 17, 2015, 03:17:23 PM »
So how will you attach them?
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"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 SOHC4 Cafe Racer Fan

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Re: and so it begins, cb550k under the knife
« Reply #81 on: March 17, 2015, 05:14:28 PM »
Quote from: DMcD on March 17, 2015, 03:16:33 PM
Quote from: CB750 Cafe Racer Fan on March 16, 2015, 04:54:29 PM
Any particular reason to form them at a 90 degree angle?



There you go!  Cal does raise a good question regarding the dissimilar metals.  Why not use the stock tubes or a steel bracket?
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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 Riceman

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Re: and so it begins, cb550k under the knife
« Reply #82 on: March 17, 2015, 07:43:46 PM »
Aren't all rear sets bolted on?
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Offline DMcD

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Re: and so it begins, cb550k under the knife
« Reply #83 on: March 18, 2015, 12:08:46 AM »
Yes, I just intend boring some holes in steel, plate which will be welded to the frame, and the aluminium then bolted to it.

The passenger pegs would have done the job ok, but I just fancied making them from aluminium.
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Offline calj737

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Re: and so it begins, cb550k under the knife
« Reply #84 on: March 18, 2015, 05:26:01 AM »
I agree, much better to make them. Was just busting your chops a wee bit, since you hadn't declared your intentions of the bolt-to steel tabs.
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"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 Retro Rocket

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Re: and so it begins, cb550k under the knife
« Reply #85 on: March 18, 2015, 03:07:32 PM »
Quote from: DMcD on March 18, 2015, 12:08:46 AM
Yes, I just intend boring some holes in steel, plate which will be welded to the frame, and the aluminium then bolted to it.

The passenger pegs would have done the job ok, but I just fancied making them from aluminium.

Have you ridden round for long with your feet on the rear pegs...?  Not very comfortable at all....
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Offline DMcD

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Re: and so it begins, cb550k under the knife
« Reply #86 on: March 19, 2015, 12:08:05 AM »
Quote from: Retro Rocket on March 18, 2015, 03:07:32 PM

Have you ridden round for long with your feet on the rear pegs...?  Not very comfortable at all....

You are right, I will be going a little less extreme than the passenger pegs.  Considering trying to have some adjustment in the plates, if I can work out the hole geometry, gear linkage, brake cable mounting etc.
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Offline bwaller

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Re: and so it begins, cb550k under the knife
« Reply #87 on: March 19, 2015, 04:42:45 AM »
I agree with RR on this. Just for some perspective here is the rear set placement on my racebike. Maybe I'm not so flexible anymore but these are not comfortable for very long!  ;D


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Offline FunJimmy

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Re: and so it begins, cb550k under the knife
« Reply #88 on: March 19, 2015, 03:44:28 PM »
Here's the approach I took.
9 way adjustable plates bolted to the frame via engine & swingarm bolts.
Rear-sets can then be bolted acordingly.



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Offline DMcD

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Re: and so it begins, cb550k under the knife
« Reply #89 on: April 22, 2015, 02:45:47 PM »
Been busy doing other stuff, (including a week on the Isle of Man with my BSA) but finally got a bit of time on work on the rear sets, just going slowly using hand tools.  Lots more metal to remove, but i like the holes.

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Offline DMcD

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Re: and so it begins, cb550k under the knife
« Reply #90 on: May 27, 2015, 03:19:34 PM »
Haven't got much done recently, working on other bikes, but mounted one of the foot rest hangers tonight.  I can remove more metal from the bracket and hangers if they look a bit too heavy duty.  Not really liking them at the minute, but I'll see how they fit in as the  build continues.







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Offline SOHC4 Cafe Racer Fan

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Re: and so it begins, cb550k under the knife
« Reply #91 on: May 27, 2015, 04:20:33 PM »
Quote from: DMcD on May 27, 2015, 03:19:34 PM
Haven't got much done recently, working on other bikes, but mounted one of the foot rest hangers tonight.  I can remove more metal from the bracket and hangers if they look a bit too heavy duty.  Not really liking them at the minute, but I'll see how they fit in as the  build continues.



The brackets look a little clunky, but will likely do the 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 DMcD

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Re: and so it begins, cb550k under the knife
« Reply #92 on: July 06, 2015, 03:04:26 PM »
Got a little bit of inspiration today when I scored a cb650 cam off US ebay.  My budget is a bit tight but I can justify the rebore now for the Chinese pistons, and will keep saving for the cr29s and ignition goodies.

Advice from this site would be to leave the bottom end alone if it doesn't need touched, but I have a question, what is the best way to clean up the cases for painting if you are not doing a strip down?  I presume it is better to do the cleaning before taking the head and barrels off to keep the crap out of the bottom end?

That is horrible, cracked silver paint.



The chain guard was broken, but I was able to fix it with the tig.  You just need to remember to hold your breath when welding galvanised ;-)













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Offline DMcD

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Re: and so it begins, cb550k under the knife
« Reply #93 on: July 21, 2015, 02:21:56 PM »
Yippee!



650 cam Looks to be in good condition.
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Offline SOHC4 Cafe Racer Fan

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Re: and so it begins, cb550k under the knife
« Reply #94 on: July 21, 2015, 03:23:09 PM »
It's funny.  CB650 cams are getting scarce on ebay, but you can still buy an entire 650 or 650 parts bike relatively cheaply and part it out if necessary.  I'd rather not sacrifice an entire bike for a cam, so I just took the whole stinking cb650 motor to drop into my 550 frame and I'm keeping the titled fugly '82 frame in case I want if for something down the road.
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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 DMcD

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Re: and so it begins, cb550k under the knife
« Reply #95 on: July 29, 2015, 02:33:16 PM »
Finally started into the engine.  What I thought was a clean bike, has had previous surgery.  Several stripped threads so far, and many odd fasteners.



Had enough for tonight, bit apprehensive about what lies ahead.  The bike was only showing 20k miles, so not sure why someone had the head off already.


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Offline DMcD

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Re: and so it begins, cb550k under the knife
« Reply #96 on: August 03, 2015, 03:24:53 PM »
The head would not come off the barrels due to the front centre bolt, which seems exposed to all the elements, and had seized.  It sheared off, but they would still not come apart, so I had to cut it with a dremmel, and then try to get the two halves of the bolt out.

This did not go well.  Ended up drilling it out, and making a big enough hole to fill with the tig.  Alloy soaked in oil for 40 years does not weld nicely!  Anyhow, I hopefully got enough new metal in there to take a thread insert.









I don't see this bolt as being critical anyway as it seems to be a bit crappy that it tightens onto the fins?

Can someone confirm these bolts are metric fine before I start re-threading thanks?





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Offline calj737

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Re: and so it begins, cb550k under the knife
« Reply #97 on: August 03, 2015, 05:24:08 PM »
8x1.25 I believe right there. Else, it's a 6x1.0
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"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 DMcD

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Re: and so it begins, cb550k under the knife
« Reply #98 on: August 04, 2015, 08:00:54 AM »
Left the barrels in for the cruzinimage rebore, and they asked me about piston clearance.  Research shows 0.002" let me know if this is wrong, as they won't do the work until next week.
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Offline DMcD

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Re: and so it begins, cb550k under the knife
« Reply #99 on: August 06, 2015, 11:28:05 PM »
Repaired another botch on the head last night.  Starting to think that Frankenstein has done a bit of work on this head in the past :o



Cut



Filled



Filed












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