Author Topic: 1972 CB750 Four K2 -- Rebuilt to NEW OLD STOCK -- PIX ON PAGE 50  (Read 242928 times)

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Offline edwardmorris

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1972 CB750 Four K2 -- Rebuilt to NEW OLD STOCK -- PIX ON PAGE 50
« on: September 15, 2013, 08:23:46 AM »
Paraphrasing the famous cgreen from the TRD forums "We all love our rollas, but we can't turn horse$hit into ice cream."
Well, that's the goal here, turn the junker I picked up, identify everything missing or broken on it, then replace and fix it all. I already have a few threads dealing with a number of issues floating around and I cannot express how thankful I am to the SOHC community who have been helping me out from the very beginning. 754 advised I take a long good look at the bike end to end and identify what it needs. Every time I look closely at it, I end up being depressed a little more because of how much work this junker needs. But I'm over it, like another member here pointed out, Rome wasn't built in a day, so I'm in a better mindset now to get this thing back on the road. Also, dealing with one issue on one thread, I find something else wrong with it and I end up hijacking the original thread myself. So this main project thread will hopefully help me keep things contained. I will treat this as the master thread and add links to individual issue threads here.

My initial goal was to get the bike on the road (as crappy as it looks) because the engine runs but the more I tinker with it, I realize this may not be the brightest of ideas. So I'm just going to let that go and start following whatever advice the old timers and experts here have for me. First things first, please take a look at these pictures and help me identify what's missing and how important it is, so I can prioritize acquisition. Here are some links to what I'm already working on in parallel as time allows (big stuff on weekends, small stuff whenever I find time).

The HM341 Disaster
Clutch Adjustment issue
Rear wheel grinding issue
Intro to bike/general (some progress, stopped gas leak)
Front brake (made most progress on this one)
Parts search (had fair luck with the hunt so far)
Electrical Teardown (moving along slowly)

« Last Edit: December 03, 2015, 03:29:27 PM by edwardmorris »

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"
« Reply #1 on: September 15, 2013, 08:25:30 AM »
More

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"
« Reply #2 on: September 15, 2013, 08:26:56 AM »
Continuing

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"
« Reply #3 on: September 15, 2013, 08:31:49 AM »
Still going

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"
« Reply #4 on: September 15, 2013, 08:36:16 AM »
Sorry for so many posts, I can't upload more than 2 or 3 at a time

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"
« Reply #5 on: September 15, 2013, 08:37:51 AM »
Almost done

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"
« Reply #6 on: September 15, 2013, 08:39:25 AM »
Last three

Offline lwahples

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"
« Reply #7 on: September 15, 2013, 08:42:53 AM »
Looks like you have a few parts to find. Least the forks are correct.I have a 72 that is sitting while I slowly gather the correct parts. To me, that's part of the fun. Good Luck.

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"
« Reply #8 on: September 15, 2013, 09:29:21 AM »
Looks like you have a few parts to find. Least the forks are correct.I have a 72 that is sitting while I slowly gather the correct parts. To me, that's part of the fun. Good Luck.
See anything obvious that's missing on mine? Please let me know and I'll add it to my list. It is fun to hunt for parts, exciting when you find what you need, then just painful when you need to shell out $18 for a center stand spring C clamp ;)

Offline seanbarney41

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"
« Reply #9 on: September 15, 2013, 10:19:05 AM »
Maybe I missed it, but, is this your first bike?  Regardless, the bike is relatively complete and unmolested, but definately make sure everything has been carefully inspected and operates properly and safely before trying to ride it.  I have been following your rear wheel thread and that issue really needs to get sorted before you do any kind of moving tests.  One other thing I see in your pics, is some repaired and modified wiring...and this is one area where previous owners frequently screw up.  That cheapo auto parts store butt connector back by the tail light wiring is almost sure to fail.  Also noticed the relocated key switch.  This was a very common "back in the day" mod.  Probably, half the cb750s I have owned had it done.  Sometimes it was done properly, other times not so much...but those are very important electrical connections so make sure they are kosher.
If it works good, it looks good...

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"
« Reply #10 on: September 15, 2013, 01:26:33 PM »
Maybe I missed it, but, is this your first bike?  Regardless, the bike is relatively complete and unmolested, but definately make sure everything has been carefully inspected and operates properly and safely before trying to ride it.  I have been following your rear wheel thread and that issue really needs to get sorted before you do any kind of moving tests.  One other thing I see in your pics, is some repaired and modified wiring...and this is one area where previous owners frequently screw up.  That cheapo auto parts store butt connector back by the tail light wiring is almost sure to fail.  Also noticed the relocated key switch.  This was a very common "back in the day" mod.  Probably, half the cb750s I have owned had it done.  Sometimes it was done properly, other times not so much...but those are very important electrical connections so make sure they are kosher.
Yep, first bike and I am still hunting for a rear wheel assembly. I wondered about the wiring myself, if you look at the rear wheel thread, there is also a non stock coil in there. I'm pretty sure I'll end up changing the entire wiring harness when I start taking it apart. Any recommendations on good replacements?

Offline seanbarney41

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"
« Reply #11 on: September 15, 2013, 02:26:21 PM »
I usually try to repair what Honda supplied the bike with.  It can be tough to find the exact correct harness as there were many subtle changes over the years.  They can all be made to work though.  Even correct year reproductions (sorry, I can't remember who is offering them)tend to need a couple changes to operate correctly on some year bikes.  If you search around on this site, there is a ton of really good info for the electrical end of things.
If it works good, it looks good...

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"
« Reply #12 on: September 17, 2013, 08:25:29 AM »
Update: Center stand came in yesterday, but so did a dentist's appointment and ruined things for me. Will try and get that installed so the bike is off the bobber stand, then I can crack open that clutch case and see whats up with that...

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"
« Reply #13 on: September 17, 2013, 09:50:15 PM »
I MAY have done something really stupid. I gambled on a set of hm341s that were advertised as mildly damaged with only one pipe having rusted through. Turns out, the truth is that only one of the HAD NOT rusted through, but the other three have holes in them, one of them REALLY bad. Gamble is done, I'm outta cash, item delivered, only way to move now is forward. What I need to immediately is do whatever it takes to stop the rusting and treat what's already on there. Then, I gotta find someone who can help me patch those holes. Any suggestions on chemicals/processes to tackle severe rust?

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"
« Reply #14 on: September 19, 2013, 09:15:34 PM »
Tracking the exhaust nightmare here  http://forums.sohc4.net/index.php?topic=126914.0

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"
« Reply #15 on: October 03, 2013, 06:06:32 PM »
This came in today FINALLY! Reading up and trying to get some guys this weekend to help me carry the engine to the basement where I'm setting up shop for the winter rebuild.

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"
« Reply #16 on: October 11, 2013, 10:17:22 AM »
Hey guys, if my luck holds, I will have a couple guys coming over tomorrow to help me get the engine off the bike and moved into my shop area. Since I'm going to be doing a complete rebuild, I was looking for some input with regards to the gasket kits. After searching and reading through several projects, it seems that the unanimous agreement is over this one from cycle x

http://www.cyclexchange.net/Engine%20Parts%20(Non-Cafe-Gaskets).htm

Are there any other things that I should grab up front before I start opening it up? Recos for lubes/sealants and any other thing I'd need would be great! I will be documenting this as thoroughly as I can for other new members.

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SETBACK
« Reply #17 on: October 12, 2013, 09:44:36 AM »
I had my basement all ready to go for the engine tear down, as I was hoping to get it in there today. By the worst stroke of luck, I twisted my back going back up those stairs and now I can barely move around. All I can do now is kill time till I can actually do something and resume work...

Offline lwahples

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SETBACK
« Reply #18 on: October 12, 2013, 03:04:44 PM »
Sorry to hear,now you read up while your resting.

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- (slow) DISASSEMBLY
« Reply #19 on: October 20, 2013, 11:10:39 AM »

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- (slow) DISASSEMBLY
« Reply #20 on: October 28, 2013, 11:07:12 AM »
So far, most of the electrical stuff is off the bike, took off the carbs and 4-1 megaphone over the weekend. Have had the gauges off for a while but noticed something this morning on my way to the car, yet another heart sinker, the fork T/mount where the gauges sit has also been cut haphazardly for reasons beyond my comprehension. Sad pic when I get home...

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- (slow) DISASSEMBLY
« Reply #21 on: October 28, 2013, 09:35:19 PM »
Here it is, what do you guys think? Should I replace it or make it work?

Offline lwahples

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- (slow) DISASSEMBLY
« Reply #22 on: October 29, 2013, 04:16:21 AM »
To make it right,depends. Are you restoring? If so,than yes.But you will also need to find 72 gauges.Good Luck.

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- (slow) DISASSEMBLY
« Reply #23 on: October 29, 2013, 09:20:56 AM »
To make it right,depends. Are you restoring? If so,than yes.But you will also need to find 72 gauges.Good Luck.
Yes, I'm going for a stock restore or as close to it. I do have the gauges with, trying to see if I can change out the faces and glass on them. I'll look up the fiche to find the part name and add it to my parts wanted thread. Thanks.

Offline flybox1

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- (slow) DISASSEMBLY
« Reply #24 on: October 29, 2013, 09:31:23 AM »
"love what you've done to the place(wallpaper)"  ;D
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

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