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Author Topic: 78 CB750K build, should be interesting.  (Read 11859 times)

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Yak

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Re: 78 CB750K build, should be interesting.
« Reply #50 on: June 03, 2009, 02:29:07 PM »
a small brown box arrived while i was at work today, thanks a million mystic, we owe it to you.

We've ordered a battery tender to help maintain battery health during our start up process, as soon as it arrives im going to get my hands on a new set of sparks and get back to work.
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Offline Sheik Yerbouti

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Re: 78 CB750K build, should be interesting.
« Reply #51 on: June 03, 2009, 03:41:28 PM »
Nice! If you get that exhaust mounted can we please get a full bike shot? Please Yak? Pretty please?
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Yak

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Re: 78 CB750K build, should be interesting.
« Reply #52 on: June 03, 2009, 07:59:29 PM »
yeah, but i'm still working on getting that last stud out.
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Offline mystic_1

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Re: 78 CB750K build, should be interesting.
« Reply #53 on: June 03, 2009, 08:07:56 PM »
Quote from: Yak on June 03, 2009, 07:59:29 PM
yeah, but i'm still working on getting that last stud out.


As a last resort, use two vice grips on it, placed 180 degrees from each other, and use them like a t-handle.

mystic_1
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"A ship in harbor is safe, but that is not what ships are built for."
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My build thread:  http://forums.sohc4.net/index.php?topic=68952.0

Offline Sheik Yerbouti

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Re: 78 CB750K build, should be interesting.
« Reply #54 on: September 23, 2009, 07:51:43 PM »
We tried the vice grip thing, didn't work.

I'm going to ground two sides flat with my dremel and try to get it out with a wrench.

Yak was working on it for a few weeks while I was gone, got all the electrics hooked up but couldn't get a spark. I'll get him to post a reply with what exactly he tried and he'll get you guys some details. All I want to do is hear it run.
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Offline Sheik Yerbouti

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Re: 78 CB750K build, should be interesting.
« Reply #55 on: September 24, 2009, 07:52:14 AM »
Way to let me down yak.
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Offline Sheik Yerbouti

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Re: 78 CB750K build, should be interesting.
« Reply #56 on: September 28, 2009, 09:00:47 AM »
Okay updates, but unfortunately no pictures.

We monkeyed the engine out and onto a padded pallet. It took three guys but it went fairly smoothly. Still can't get that damned stud out. We tried dremeling a slot and using a flat head. I went out and bought a pipe wrench because I heard that may work. Still can't get it yet.

Started stripping the tank using chemical stripper. That stuff is straight up nasty. Burned right through my "stripping gloves". Got a lot of paint off, but I have to get some of the bondo out and rebondo some dents.

I conceited to the fact that I need an engine stand. I'm going to go grab the 50 dollar harbor freight one. I found some 1/4 thick aluminum angle iron at work. I was going to use it to adapt the engine stand to work. I think that'll be plenty strong.
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Yak

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Re: 78 CB750K build, should be interesting.
« Reply #57 on: September 28, 2009, 08:25:20 PM »
Alright, we've been working hard in the garage over the past few days.

so far, everything has gone pretty flawlessly, sans one exhaust stud.

tonight we hit a few snags.

Last night I removed the rocker arm assembly and he camshaft, tonight we removed the head and the cylinders, not separately i might add. which brings us to the next snag. the head is completely stuck onto the cylinders, we tried a little bit of everything to get it off, but were hesitant so as not to bend any fins. when i gave the head a tug to try to free it from the cylinders, the cylinders came too, so the whole thing is off the case, but stuck together. Surprisingly, there was also no gasket between the case and the cylinders.

After that, we removed the pistons, keeping sure to know exactly how they came out in order to place them back in the exact same way. I'll take more pictures tomorrow in the sunlight, the sun had set and we were using flash in a poorly lit garage to take end of the evening pictures. But give me a few minutes and ill add them into the thread.

Hopefully Mystic will have the saving answer for us, but does anyone know how we can attack the head to remove it from the cylinders?
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Offline Sheik Yerbouti

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Re: 78 CB750K build, should be interesting.
« Reply #58 on: September 28, 2009, 08:27:10 PM »
Well, there was kind of a gasket. It was thin and brittle. A piece of it broke off and fell down into the case. Should we be worried about it down there? It wasn't a very big piece.
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Offline mystic_1

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Re: 78 CB750K build, should be interesting.
« Reply #59 on: September 29, 2009, 05:21:28 AM »
Did you guys remove all six of the small bolts under the cam tower pucks?

If so, some light prying with a thin piece of wood between the cylinder fins and the head fins may do the trick.  Use thin wood so the wood will break before the fins.

mystic_1

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"A ship in harbor is safe, but that is not what ships are built for."
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My build thread:  http://forums.sohc4.net/index.php?topic=68952.0

Offline Sheik Yerbouti

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Re: 78 CB750K build, should be interesting.
« Reply #60 on: September 29, 2009, 01:43:58 PM »
I can grab some wood shims and try that. We'll have a bunch of pretty pictures up soon. The pictures we had were bad because of the lack of daylight.
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Offline Sheik Yerbouti

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Re: 78 CB750K build, should be interesting.
« Reply #61 on: September 30, 2009, 06:21:51 PM »
Dropped the frame off at the sandblaster today. 35 for the frame and the swing arm. Not bad.
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Offline moham

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Re: 78 CB750K build, should be interesting.
« Reply #62 on: September 30, 2009, 09:26:59 PM »
You get your head off yet?
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Yak

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Re: 78 CB750K build, should be interesting.
« Reply #63 on: October 01, 2009, 07:50:16 AM »
Nope. the head is still stuck on, i have a reeling feeling that a previous owner glued the head to the cylinders instead of using a gasket. On a different thread, someone suggested that we get a plastic splitting wedge for wood and trying to seperate it with that, It still worries me that something will gouge the metal and we'll have a bigger problem on our hands.
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Offline Sheik Yerbouti

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Re: 78 CB750K build, should be interesting.
« Reply #64 on: October 01, 2009, 01:35:03 PM »
Yak, we can grab some wood shims at Ace hardware. They're soft enough that I don't think they'll damage the head.
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Yak

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Re: 78 CB750K build, should be interesting.
« Reply #65 on: October 02, 2009, 06:49:01 AM »
We picked the frame  and swing arm up from the sandblaster last night, they look great, nice and clean, no rust, no paint.

We also picked up some wood shims to try and separate the head from the cylinders, pain in the arse.

last but not least, i sat down after work last night with a small pipe wrench and a dead blow, and low a behold, I finally removed that last pesky stud from the head!
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Offline mystic_1

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Re: 78 CB750K build, should be interesting.
« Reply #66 on: October 02, 2009, 07:48:38 AM »
Quote from: Yak on October 02, 2009, 06:49:01 AM
last but not least, i sat down after work last night with a small pipe wrench and a dead blow, and low a behold, I finally removed that last pesky stud from the head!

Excellent, glad you got that sorted :)

mystic_1
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"A ship in harbor is safe, but that is not what ships are built for."
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My build thread:  http://forums.sohc4.net/index.php?topic=68952.0

Offline HedNut

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Re: 78 CB750K build, should be interesting.
« Reply #67 on: October 02, 2009, 09:20:08 AM »
Cool build!! I'm loving it... the drama, the anticipation.  GO K8's!! Wooohoo
Good Luck and enjoy every minute of it... I'm keenly watching.
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Offline Sheik Yerbouti

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Re: 78 CB750K build, should be interesting.
« Reply #68 on: October 02, 2009, 02:41:51 PM »
Yeah, it's going to be a big weekend for us. Probably going to send the frame off to powder after we grind some stuff down. I want to have the tank painted so the epoxy paint can cure all week and I can give it another coat next weekend. Still can't find piston rings, though.
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Offline Sheik Yerbouti

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Re: 78 CB750K build, should be interesting.
« Reply #69 on: October 02, 2009, 02:51:16 PM »
Oh yeah, also, any suggestions for getting this damned bondo off the tank? I don't want to apply heat in fear of it damaging the tank liner, but I used a chemical stripper on the paint and want to redo the bondo. I fear the bondo has been compromised by the stripper and would feel better if I redid all the bondo anyway.
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Yak

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Re: 78 CB750K build, should be interesting.
« Reply #70 on: October 02, 2009, 02:51:30 PM »
Alas, fridays are always good.

I Come home from work: I separate the head from the cylinders.

'tis a good day.
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Offline mystic_1

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Re: 78 CB750K build, should be interesting.
« Reply #71 on: October 02, 2009, 02:55:24 PM »
Quote from: Sheik Yerbouti on October 02, 2009, 02:51:16 PM
Oh yeah, also, any suggestions for getting this damned bondo off the tank? I don't want to apply heat in fear of it damaging the tank liner, but I used a chemical stripper on the paint and want to redo the bondo. I fear the bondo has been compromised by the stripper and would feel better if I redid all the bondo anyway.

40g sandpaper on a block should make short work of the bondo depending on how thick it's on there.  If you're feeling your oats you can use a power sander but be careful not to thin out the metal.



Quote from: Yak on October 02, 2009, 02:51:30 PM
Alas, fridays are always good.

I Come home from work: I separate the head from the cylinders.

'tis a good day.


Sweet, what was holding it on, and how did you get it off?

mystic_1
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"A ship in harbor is safe, but that is not what ships are built for."
- John Augustus Shedd

My build thread:  http://forums.sohc4.net/index.php?topic=68952.0

Offline Sheik Yerbouti

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Re: 78 CB750K build, should be interesting.
« Reply #72 on: October 02, 2009, 03:50:53 PM »
Quote from: mystic_1 on October 02, 2009, 02:55:24 PM
Quote from: Sheik Yerbouti on October 02, 2009, 02:51:16 PM
Oh yeah, also, any suggestions for getting this damned bondo off the tank? I don't want to apply heat in fear of it damaging the tank liner, but I used a chemical stripper on the paint and want to redo the bondo. I fear the bondo has been compromised by the stripper and would feel better if I redid all the bondo anyway.

40g sandpaper on a block should make short work of the bondo depending on how thick it's on there.  If you're feeling your oats you can use a power sander but be careful not to thin out the metal.



Quote from: Yak on October 02, 2009, 02:51:30 PM
Alas, fridays are always good.

I Come home from work: I separate the head from the cylinders.

'tis a good day.


Sweet, what was holding it on, and how did you get it off?

mystic_1

I'll run to the hardware store tomorrow and pick up some heavy paper. I also need to get some Bondo and another can of paint. I hope I get a paycheck soon. I've been to my local ACE hardware 6 days in a row.

We bought some wooden shims last night. I talked to Yak on the phone and he said he wedged six or so of them all around the head and popped it off. He said it seemed like some sort of gasket material or glue was under there.
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Offline HedNut

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Re: 78 CB750K build, should be interesting.
« Reply #73 on: October 05, 2009, 06:30:40 AM »
Great to hear it's moving along!!!!  HEY!...If you have any luck with those piston rings...let a brother know.  I'm looking for some too...and trying to stay away from my local (50miles away) %ss-Raping Honda dealer...lol

Can't wait to see this build unfold...or is that fold up!?...
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Offline Sheik Yerbouti

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Re: 78 CB750K build, should be interesting.
« Reply #74 on: October 22, 2009, 07:30:29 PM »
Yeah, rings are proving to be a major roadblock right now.

News and updates.

Tank is coming along, the majority of the bondo work is done, some finish sanding and feathering and she'll be ready for primer. The seat came in from a fellow forumite, and it looks amazing. I'll have to grind off some tabs and mounts to make it work, because it's meant for a pre-77 bike, but it won't be a lot of effort.

We also got the gasket set, and started cleaning up the engine. Lots of degreaser and scotchbrite pads. I found a nylon brush that fits in a drill, and I think the fine one will work really well for removing flaking paint from the engine. Hopefully she'll be ready for paint soon.

Once the specifics of the seat are figured out I'm going to grind some stuff off and send it for powder.

I want to get rid of the passenger peg mounts, but I don't know if I'll ever need those for rearsets. I can't really afford rearsets right now anyway, but if I grind em off and powder then I'm stick with finding an alternate method of mounting them. I was planning on getting rid of the helmet holder, passenger peg mounts, the seat lock, the hinging tabs, and take a few inches off the back of the frame up to the rear fender mount. Do I need to plug up the tubing at the end there with anything? Or just leave it open and powder?

But yeah, rings are getting me down. It pretty much halts the entire rebuild. Only one set is truly effed up, but people always say that when you remove the pistons you always have to replace the rings. I could send them in and get the slot turned wider, that may be my only option. Anybody remember the place that does that?
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