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Author Topic: My 1975 cb 750 Build  (Read 17437 times)

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Offline Riceman

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Re: My 1975 cb 750 Build
« Reply #25 on: December 20, 2014, 02:27:06 PM »
Probably shouldn't over extend the pistons like that...
just doesn't seem good
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Offline PPG9944

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Re: My 1975 cb 750 Build
« Reply #26 on: December 20, 2014, 03:04:10 PM »
I took out one of the pads to see what was happening.  I dont know if i would call it a leak or not but a little brake fluid pools up around the groove where the piston goes in
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Offline PPG9944

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Re: My 1975 cb 750 Build
« Reply #27 on: January 04, 2015, 05:51:14 PM »
Few updates.

Rebuilt the brakes AGAIN, i bought #$%*ty seals initially.  Went and got the pricey honda seals from the dealer put brakes back together and no leaks.  Lesson Learned.

Got the front wheel centered on the axle and lined up with the calipers as well

Got a headlight lens from a dude that has a honey hole of parts near where I live.  Will most likely be going back to him for some odds and ends.  He said he has mint exhausts.  We shall see.

Scored an oil cooler adapter plate with an oil cooler off ebay for like 20 bucks. 

And I got the carbs put back together.  One of the floats is messed up, ill probably have to grab a new one.  Oh well.



The front end looks pretty mean so far.


Need to do some more research but up next I am going to have to give the engine guy a call to see where my valve head and cylinder block are at.  I'm kinda itchin to start putting the engine back together.  Also need to look into possibly taking the swing arm apart to replace the bushings.  Not sure if i need to or not but we shall see.  Im still debating looking into electronic ignition systems, the Acewell speedometers ,breadbox air filters and upgraded rear suspension bits.  Any advice?
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Offline calj737

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Re: My 1975 cb 750 Build
« Reply #28 on: January 05, 2015, 05:00:46 AM »
Definitely replace your swing arm bushings if they show any signs of neglect or wear. Check out speedhut.com for other options on speeds and tachs. Prices are very good, components are really good. And, you can customize the face plate to your hearts content for free (in case you had a graphic or design or tatto you'd like to personalize the gauge).

2 things about switching to electronic speedos and tachs: decide now, where and how you will run the wiring for your sensors so it can be clean, safe from entanglement, and out of the way. You'll also need a tach plug switching from mechanical to electronic, and perhaps even ditch speedo unit off the front axle (need a new spacer). Just a helpful hint...
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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 PPG9944

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Re: My 1975 cb 750 Build
« Reply #29 on: January 05, 2015, 05:09:54 AM »
Calj,  I already had to ditch the speedo unit from the front axle because the cb wheel wouldn't fit on the vfr forks.  Someone suggested running the magnets on the front sprocket and sprocket cover for the speedo which sounds like a real slick and hidden idea. 

I havent taken the rear of the bike apart yet so im not sure what im looking for in terms of the swingarm being bad.    Am I looking for lateral movements?

Also thanks for the speedhut plug im going to have to check that out, never even heard of them before.
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Offline calj737

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Re: My 1975 cb 750 Build
« Reply #30 on: January 05, 2015, 05:21:03 AM »
Yep, looking for lateral and directional (front and rear) "slop" in the bushings. Good tugs and twists with frame secured, should reveal it.
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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 PPG9944

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Re: My 1975 cb 750 Build
« Reply #31 on: January 07, 2015, 04:19:21 PM »
Oh hell yea.  Got some fun bits back from the engine shop.  New valve guides.  Fresh hone.  I'm stoked to figure out how all this goes back together. 


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Offline calj737

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Re: My 1975 cb 750 Build
« Reply #32 on: January 07, 2015, 07:39:10 PM »
Hint: those round thingys go inside the tubes and under the flatfish job. Couple of nuts and bolts, and you're racing! If you have extra pars afterwards, thats OK. Save them for the re-build  ;D
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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 PPG9944

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Re: My 1975 cb 750 Build
« Reply #33 on: January 07, 2015, 07:56:05 PM »
Got a new cam chain in the mail too.  Since it's FREAKING -25 degrees here in illinois currently I'll probably wait till the weekend to put this together.  Need to read up on this stuff.
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Offline Riceman

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Re: My 1975 cb 750 Build
« Reply #34 on: January 07, 2015, 08:05:50 PM »
That's what the kitchen is for,it has a nice work bench AND it has a
fridge .... :)
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Offline WhyNot2

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Re: My 1975 cb 750 Build
« Reply #35 on: January 08, 2015, 03:40:16 AM »
Quote from: Riceman on January 07, 2015, 08:05:50 PM
That's what the kitchen is for,it has a nice work bench AND it has a
fridge .... :)

and plenty of light, and solid floors, so when you drop one of those round thingys, it won't get lost in the dirt.
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If it ain't raining, I'm riding.....~~{iii}?~~prost

If it sounds like I know what I'm talking about, it's because I cut and pasted from someone else.

Offline PPG9944

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Re: My 1975 cb 750 Build
« Reply #36 on: January 08, 2015, 04:15:48 AM »
Haha unfortunately I dont think the kitchen is an option for me.  I didnt realize how many little seals go on the cylinder block.  It's crazy
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Offline PPG9944

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Re: My 1975 cb 750 Build
« Reply #37 on: January 08, 2015, 07:17:00 PM »
Got the valve spring assembled with new valve guide seals.  Holy #$%* was that a pain in the ass.  That wrench has been my best friend throughout this build so far.  Somehow I always defer to that thing.

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Offline PPG9944

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Re: My 1975 cb 750 Build
« Reply #38 on: January 11, 2015, 07:43:28 AM »
Starting Reassembly!

Scraped off the old base gasket remains


Looked in the oil pan.  Determined things looked nice and clean.  Cleaned it up and closed it back up.


In replacing the timing chain we went with this method.  Grind off the ends of the links off one of the links and pop it out. Then used that removed link to clamp the new timing chain together.






This is how we felt after getting the chain replaced


Went to harbor freight to get a chain breaker,  managed to break it within a half hour.  Lesson learned haha
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Offline PPG9944

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Re: My 1975 cb 750 Build
« Reply #39 on: January 11, 2015, 07:48:33 PM »
Things were going so well until this happened.  Oh well I tried getting away with using the original studs.  Lesson learned.  APE cylinder studs are on the way as well as a Pamco ignition.  I'm stoked to see the thing resemble a motor again.

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Offline PPG9944

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Re: My 1975 cb 750 Build
« Reply #40 on: January 18, 2015, 07:06:35 AM »
Was able to get some stuff done yesterday.  Had to sacrifice that base gasket due to the snapped cylinder stud. Called a few places but no one had one, oh well got a new one ordered. 

Snapped cylinder stud.


To go about removing, we used the double nut method and some help from some vice grips.  The broken stud we put a pair of vice grips on super tight, and tapped on the stud with a hammer while putting lateral force on the stud.  After some swearing and a few slips we were able to back the stud out. 




Since I couldnt find a base gasket, we installed the new pamco ignition that came in.  I'm hoping for a reassembled engine next weekend.
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Offline PPG9944

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Re: My 1975 cb 750 Build
« Reply #41 on: January 22, 2015, 04:39:57 PM »
After a whole bunch of crap, this thing is finally starting to look like a motor once again!  Going to retorque the nuts again tomorrow, and the on saturday I'll retorque again and drop the cam towers in and the camshaft.  Should be a great time.




I also got my push pull throttle from motion pro.  It will clean up my handlebars a little bit and keep things tidy.


So much to do but I'm stoked!
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Offline PPG9944

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Re: My 1975 cb 750 Build
« Reply #42 on: January 24, 2015, 04:57:11 PM »
WOO hit a milestone today!  Dropped the camshaft in.  I spent a lot of time reading posts regarding the cam tower and I went with Hondaman's technique of not using the 5mm bolts to hold the shafts in place and I drilled out the little oiling holes.  I dont plan on racing this bike but hell I'll give it a shot.  If it blows up then I'll rebuild it.

Need to learn about tappet clearances, timing and I need to figure out if the stator works or not. 

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Offline PPG9944

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Re: My 1975 cb 750 Build
« Reply #43 on: January 26, 2015, 06:59:58 PM »
So I'm planning on running coils from a 2001 Honda Magna With the pamco ignition.  Will I have any issues with this setup?
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Offline PPG9944

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Re: My 1975 cb 750 Build
« Reply #44 on: January 27, 2015, 07:18:55 PM »
Started making slugs for the frame and the rear hoop.  Need to figure out how im going to bend the rear hoop still with no fancy tools.

And the covers started getting the red scotchbrite treatment.  I have to spend a lot more time getting those brushed out.

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Offline PPG9944

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Re: My 1975 cb 750 Build
« Reply #45 on: January 28, 2015, 07:07:23 PM »


Some of you have fancy tools.  I have a grinder and a vice.  Had to taper that tube which will eventually be cut and used as frame slugs for the rear hoop. 

Anyone know how to bend a tube without a tube bender?  Does the sand thing work? Or sand and a little bit of heat?
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Offline calj737

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Re: My 1975 cb 750 Build
« Reply #46 on: January 29, 2015, 03:42:56 AM »
Fill the tube with sand and block the ends. Heat the tube primarily where you want to bend it and keep heat on it while bending. Bend slowly, and apply heat to outside of the radius. You should use enough heat that you don't get a hernia when bending the tube.

Block it in place while it cools. The sand prevents the inside radius from crushing, the heat on the outside allows the stretch.
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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 PPG9944

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Re: My 1975 cb 750 Build
« Reply #47 on: January 29, 2015, 04:23:48 AM »
Ok that makes sense.  I think I'm going to build a dye out of some wood to get the shape I want.
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Offline PPG9944

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Re: My 1975 cb 750 Build
« Reply #48 on: February 02, 2015, 06:32:38 PM »
Got some more covers polished up.  And Adapted the stock coil mounts to the VF750 coils.





I had to mount the coils underneath rather than on top of the mounts.  I think Im going to make a notch in the one bracket to lift the coils just a bit so I have some room.



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Offline PPG9944

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Re: My 1975 cb 750 Build
« Reply #49 on: February 06, 2015, 04:22:44 PM »
This came in the mail today.  So pumped.  It'll get painted so im not concerned about the state of the chrome at all. Hell yea!

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