Author Topic: CB750 890cc Engine build [Codename: Rattlesnake]  (Read 40883 times)

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Offline michrobi

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CB750 890cc Engine build [Codename: Rattlesnake]
« on: March 25, 2010, 11:13:29 am »
I was going to start this thread a little closer to build time, but dammit I gots pictures for lookn' at!

Let's start with some motivational eye candy, eh?

890cc kit & HD Cylinder and Main studs provided by the fine gentlemen over to Dynoman.
Cycle-X Super-Rods.
RC teflon piston pin buttons.

This build is going to have an F2 Crank/Case/Trans and a K6 Head/Cylinder block. I'll get to work on the F2 teardown this weekend and toss around some more pics. Mike Rieck has the head. Buzz, Mark 'HondaMan' and Mike Rieck have all been key to helping me get this thing off to a good start. Thank you guys for your help and support.

 ;D
« Last Edit: March 25, 2010, 02:38:43 pm by michrobi »
-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline sangyo soichiro

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Re: 890cc Engine build [Codename: Rattlesnake]
« Reply #1 on: March 25, 2010, 12:28:08 pm »
Looks like a nice pile of parts there.  Those Cycle X rods are pretty nice, aren't they?  Those are the ones I got too.  I was impressed.
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Offline The_Crippler

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Re: 890cc Engine build [Codename: Rattlesnake]
« Reply #2 on: March 25, 2010, 12:37:08 pm »
Just for clarification, I assume that this is a 750 being up-gunned, right?

Offline michrobi

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Re: 890cc Engine build [Codename: Rattlesnake]
« Reply #3 on: March 25, 2010, 02:37:34 pm »
Looks like a nice pile of parts there.  Those Cycle X rods are pretty nice, aren't they?  Those are the ones I got too.  I was impressed.

They are really nice, I was a little surprised actually when they gave me goosebumps.
-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline michrobi

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Re: 890cc Engine build [Codename: Rattlesnake]
« Reply #4 on: March 25, 2010, 02:39:49 pm »
Just for clarification, I assume that this is a 750 being up-gunned, right?

Yessir, stock 736cc currently.
-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline michrobi

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #5 on: March 26, 2010, 04:56:37 pm »

These studs are being filthy buggers, ugh.     :-[
-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline Big Jay

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #6 on: March 26, 2010, 07:10:46 pm »

These studs are being filthy buggers, ugh.     :-[

??

Offline BLUE71TURBO

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #7 on: March 26, 2010, 07:17:24 pm »
Big Jay, I believe he's trying to remove the cylinder studs.  ::)  ;D
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Offline michrobi

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #8 on: March 26, 2010, 08:19:58 pm »

Yeah, getting the stock studs out I meant... three down, 13 to go.... Only been at it all day. I hope my Central Elec heat gun holds out.
-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline MRieck

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #9 on: March 26, 2010, 08:26:29 pm »

Yeah, getting the stock studs out I meant... three down, 13 to go.... Only been at it all day. I hope my Central Elec heat gun holds out.
Get a MAPP gas torch....you need some real heat. :) ;)
Owner of the "Million Dollar CB"

Offline bubbafun101

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #10 on: March 26, 2010, 09:25:38 pm »
What ya gonna do for a cam?

Offline michrobi

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #11 on: March 26, 2010, 09:54:20 pm »

I'm shopping for the cam still, I like megacycle. Maybe a 125-65 or 75.
-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline MRieck

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #12 on: March 26, 2010, 10:36:53 pm »

I'm shopping for the cam still, I like megacycle. Maybe a 125-65 or 75.
That's the one
Owner of the "Million Dollar CB"

Offline michrobi

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #13 on: March 27, 2010, 11:49:58 am »
Get a MAPP gas torch....you need some real heat. :) ;)

I picked one up today and used it. The stud giving me the most trouble (so far) still won't budge, and it actually snapped off about 1/2" above the surface of the case. There are 4 cylinder studs that had capped nuts with copper washers and little rubber boots around the base of the studs. Those 4 studs are extremely rusty. I've only worked on one of the 4 so far, and it's the one that just snapped off. The last case I broke a sud on, I had to take to a machine shop and have them remove it. They drilled it out and didn't drill it straight so that case was wasted. Charged me $85 for my trouble.

I'm sending the top case to APE to be bored for the new sleeves. I think I'll stop before I break any more and just have the APE guys take them out. Looks like it's only $30 to have APE remove the top case studs. At this point I think that's going to be $30 well spent.
-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline michrobi

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #14 on: March 27, 2010, 04:32:08 pm »


Got them all but those 4 copper top studs. See the one that broke? Those four just will not turn for me  :(

That torch made quick work of all the others though. Like butter with that bad boy. I thought welding a nut on those 4 remaining studs close to the surface would help, but I have no welder or skills to use one. I hope the guys at APE can get those buggers out. I've lost faith in using local machinists.
-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline MRieck

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #15 on: March 27, 2010, 06:05:06 pm »
 Copper?? They ain't copper....theys just "stuck" boy. ;)
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Offline MRieck

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #16 on: March 27, 2010, 06:11:30 pm »
Copper?? They ain't copper....theys just "stuck" boy. ;)
Seriously....you can soak those for 3 months....which I've done and then they come out with big heat. I'd send to APE  and let them handle it
Owner of the "Million Dollar CB"

Offline 8 Track

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #17 on: March 27, 2010, 06:18:27 pm »
I've drilled those out before, but you've got to be so careful and be right on center.  Once they get thin enough, a pipe easy out (stubby easy outs from the snap on crack truck) gets them out.  You did the right thing by stopping before you goof something up, if you were unsure.  There's no shame in that.
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Offline MCRider

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #18 on: March 27, 2010, 06:19:56 pm »
I had one with a lot less than that sticking up. Machine shop welded a stud onto it, heated it pretty hot (I wasn't there, thankfully) and he turned it out.

And yeah, those ain't copper. They're really rusty steel. Bout the worst I've seen.
« Last Edit: March 27, 2010, 06:21:37 pm by MCRider »
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Offline 8 Track

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #19 on: March 27, 2010, 06:21:39 pm »
P.S. this is going to be a sweet build.  I'll be following it fo sho!
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Offline andy750

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #20 on: March 27, 2010, 08:10:49 pm »
Mike and I know all about snapping studs upon removal...in my K2 the first stud we tried snapped at the base...+2 hrs to remove the base stuck in the case.

Looking forward to the build!

cheers
Andy

Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico (CB750K4), 2003 - European Tour (CB750K4), 2004 - SOHC Easy Rider Trip (CB750K4), 2008 - Adirondack Tour 2-up (CB750K4) , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. VStrom DL1000 2003
4. XLR650L 2006

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Offline mick7504

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #21 on: March 27, 2010, 08:30:58 pm »


Got them all but those 4 copper top studs. See the one that broke? Those four just will not turn for me  :(

That torch made quick work of all the others though. Like butter with that bad boy. I thought welding a nut on those 4 remaining studs close to the surface would help, but I have no welder or skills to use one. I hope the guys at APE can get those buggers out. I've lost faith in using local machinists.

Those 4 studs are in exactly the same place on the F2 top case that I'm working on at the moment.
The others came out with some persuassion but those 4 have got the heels dug in.
I did notice that some of the stud holes had been drilled all of the way through and those 4 are blind holes.
As they will find out, "resistance is of no use"  ;D
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Offline Big Jay

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #22 on: March 27, 2010, 09:31:16 pm »
If we break them off, then we talk about the price for drilling them out.

Offline michrobi

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #23 on: March 27, 2010, 10:55:49 pm »
Sounds fair  :)
-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: CB750 890cc Engine build [Codename: Rattlesnake]
« Reply #24 on: March 28, 2010, 07:04:06 pm »
Where did you find the teflon buttons?????
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

 

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