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Author Topic: About to do the 650 into a 550 swap. 650 teardown  (Read 3688 times)

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Offline CBGhia

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Re: About to do the 650 into a 550 swap. 650 teardown
« Reply #25 on: October 16, 2015, 03:32:32 PM »
Some of you may have seen my track day thread.  I locked up my 550 engine.   :-[

Well, that moves up the timetable for this swap.  I pulled the head apart and have it soaking in some simple green pro.  Here are some more shots.  What do you think of the wear on these bearing surfaces?  Can I lightly sand these to fix them or is this head trash?

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Quote from: dave500 on February 14, 2014, 03:53:33 AM
if you dont trial spin the camshaft in the head and cover you are a novice,with no natural mechanical appitude,destined for destruction.
"The cleaner the dipstick, the closer to God." -Rev. Horton Heat
“Faster, Faster, until the thrill of speed overcomes the fear of death.”  - Hunter S. Thompson

Offline seanbarney41

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Re: About to do the 650 into a 550 swap. 650 teardown
« Reply #26 on: October 16, 2015, 06:21:49 PM »
I don't know if you want to do that...but I would go ahead and run those cam bearings...fixing 'em means a new head or expensive bushings and line boring.  They will probably live long enough for a fresher head to be found.  Why not ride in the meantime?  Might even last longer than your interest in the bike.
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Offline Stev-o

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Re: About to do the 650 into a 550 swap. 650 teardown
« Reply #27 on: October 16, 2015, 07:02:00 PM »
Personally, I wouldn't run it and would find a replacement head.

But it could be run...
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Offline SOHC4 Cafe Racer Fan

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Re: About to do the 650 into a 550 swap. 650 teardown
« Reply #28 on: October 17, 2015, 01:18:47 AM »
I agree with Stev-o.  Those bearings look worn.  You can find a better replacement head.
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Offline CBGhia

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Re: About to do the 650 into a 550 swap. 650 teardown
« Reply #29 on: October 17, 2015, 04:17:25 AM »
Thanks guys.  Stevo, keep your eyes open for a 79-80 650 head.
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Quote from: dave500 on February 14, 2014, 03:53:33 AM
if you dont trial spin the camshaft in the head and cover you are a novice,with no natural mechanical appitude,destined for destruction.
"The cleaner the dipstick, the closer to God." -Rev. Horton Heat
“Faster, Faster, until the thrill of speed overcomes the fear of death.”  - Hunter S. Thompson

Offline bwaller

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Re: About to do the 650 into a 550 swap. 650 teardown
« Reply #30 on: October 17, 2015, 04:33:06 AM »
A camera always makes these surfaces look damaged. There is only a polished contact area & no scoring?

I think it's fine.
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Offline MRieck

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Re: About to do the 650 into a 550 swap. 650 teardown
« Reply #31 on: October 17, 2015, 07:12:10 AM »
Quote from: bwaller on October 17, 2015, 04:33:06 AM
A camera always makes these surfaces look damaged. There is only a polished contact area & no scoring?

I think it's fine.
I agree
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Offline SOHC4 Cafe Racer Fan

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Re: About to do the 650 into a 550 swap. 650 teardown
« Reply #32 on: October 17, 2015, 09:23:33 AM »
I would trust Brent and Mike's opinions over mine any day of the week. It looks like your head is okay.
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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)
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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 CBGhia

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Re: About to do the 650 into a 550 swap. 650 teardown
« Reply #33 on: October 17, 2015, 10:27:18 AM »
Ran my fingers over the surface and they are all very smooth.   Thanks MRieck and bwaller!  You guys rock! 
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Quote from: dave500 on February 14, 2014, 03:53:33 AM
if you dont trial spin the camshaft in the head and cover you are a novice,with no natural mechanical appitude,destined for destruction.
"The cleaner the dipstick, the closer to God." -Rev. Horton Heat
“Faster, Faster, until the thrill of speed overcomes the fear of death.”  - Hunter S. Thompson
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