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Author Topic: Re: 78 cb750f 1st build (Complete 6-13 pics)  (Read 8782 times)

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Offline cheapride

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Re: 78 cb750f 1st build (Complete 6-13 pics)
« on: October 31, 2011, 10:56:45 AM »
Hello, 

I have a 78 cb750f with 31000 miles on it.  I am rebuilding the bike this winter.  I installed new braided lines and progressive springs last year. Along with new bars, seat and correct side covers.  This time it is the rest of the bike.  The bike is now in pieces and the engine in on a table. 

The motor is going to get a 41a cam, 836 pistons, hd studs, new valve seals and new cycle x valves, springs and retainers.  I have a entire box of new parts that are ready to be installed.  I will take some pics this weekend when I crack the engine.

I hope everything will go smooth.

Brent
« Last Edit: June 13, 2012, 05:56:06 PM by cheapride »
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1978 cb750f Supersport

Offline rklystron

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Re: Just another 78 cb750f build
« Reply #1 on: October 31, 2011, 01:22:50 PM »
Good luck. I am sure your build will be awesome. I did the same thing almost on a 77F. Love my CB750 F2. I look forward to seeing your progress.
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1970 CB750 K0 (Bought in 73)
1972 XL250 (Bought new in 72)
1973 ST90 (Free)
1975 XL250 (Free)
1975 Rickman CR750
1982 CBX1000 Pro-link
1975 CB750 DRAG BIKE
1977 Custom Built CB750 Sturgis Bike (GL front end).
1977 CB750 F2 (Big Resto)
1977 CB750A (Auction Buy)
1978 CB750 K8 (My San Francisco ride)
1984 VFR750 (Bought New)

Offline cheapride

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Re: Just another 78 cb750f build
« Reply #2 on: November 01, 2011, 10:31:17 AM »
I just took some photos and will try to upload them tonight.  The head is now off and getting worked on and will be shipping the jugs out soon.  I am going to have my head ported and polished a little when the valves, valve guides, seals, springs and retainers are installed (All are from Cycle X) .  My friend that is doing the work has been doing heads for pulling tractors for quite a while.  He did my friends 78K a couple of years ago.  Any tips for him?

Next step removing the cylinder studs.  Wish me luck.

Thanks,
Brent

« Last Edit: December 12, 2011, 06:19:40 AM by cheapride »
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1978 cb750f Supersport

Offline cheapride

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Re: 78 cb750f 1st build
« Reply #3 on: November 01, 2011, 06:18:05 PM »
Here are a couple of photos with all the parts off.  The bike with it's bare frame and the engine on a table. The engine was leaking oil out of the valve cover.  The bike would smoke when started and the smoke would stop.  It would  come back when you would do a quick stop enough that it was like riding a smoke bomb. 

The head came off with no problems.  One of the 6mm bolts in the center was caked in dirt and grease enough that the socket started to slip and I was worried that it might round off the bolt.  I got another extension and was able to get it out. 

The shop manual that I got with the bike is an original with hand written notes in it.  The funny thing is that they are copied in.  It is like the book was edited and then the edited version got copied and made into a book.  The guy I bought the bike off of said that it was the book he got with the bike 5 years before. 

I am going to redo the oil lines and rear brake line in stainless braided hose.   I have access to some nice hose making equipment that isn't being used that much.  Should look nice.
« Last Edit: November 02, 2011, 07:54:11 AM by cheapride »
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1978 cb750f Supersport

Offline AbbyRider

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Re: 78 cb750f 1st build
« Reply #4 on: November 02, 2011, 05:13:59 PM »
I'll be following this build thread for sure. I've got a 78 750F as well, and will be doing a top end rebuild this winter. I've actually got the exact same symptoms as you. How was it getting the engine out? I hear horror stories and then I hear guys saying it was no problem.
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Offline cheapride

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Re: 78 cb750f 1st build
« Reply #5 on: November 06, 2011, 06:09:25 PM »
Quote from: AbbyRider on November 02, 2011, 05:13:59 PM
I'll be following this build thread for sure. I've got a 78 750F as well, and will be doing a top end rebuild this winter. I've actually got the exact same symptoms as you. How was it getting the engine out? I hear horror stories and then I hear guys saying it was no problem.
Removing the engine wasn't that bad.  It is heavy.  Two people 15 minutes after everything is removed except for the engine mounts. 
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Offline cheapride

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Re: 78 cb750f 1st build
« Reply #6 on: November 06, 2011, 06:17:36 PM »
Got the cylinder studs out.  One stud was getting close to breaking but after a little penetrating oil it broke lose.  The engine is now in two pieces.  The cam roller was very rough and looked very chewed up.  Replacing that should make the engine much quieter. 

The little pieces in the shifter look like a watch.  I hope I can get them back in the correct order.  How much harder it is to remove the transmission and clutch?  I was thinking about soda blasting the cases.

Next step it the head work, boring the cylinders and cleaning the cases.  I also have to get the frame cleaned and ready for the gordon frame kit. 
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1978 cb750f Supersport

Offline cheapride

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Re: 78 cb750f 1st build
« Reply #7 on: November 06, 2011, 06:28:23 PM »
stud removal vise grips and hammer
« Last Edit: November 06, 2011, 06:30:48 PM by cheapride »
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1978 cb750f Supersport

Offline cheapride

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Re: 78 cb750f 1st build
« Reply #8 on: November 06, 2011, 06:33:23 PM »
shifter parts
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1978 cb750f Supersport

Offline cheapride

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Re: 78 cb750f 1st build
« Reply #9 on: November 06, 2011, 06:35:59 PM »
top case
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1978 cb750f Supersport

Offline cheapride

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Re: 78 cb750f 1st build
« Reply #10 on: November 06, 2011, 06:38:06 PM »
bottom case.  How much more work is it to remove the transmission?
« Last Edit: November 06, 2011, 07:03:54 PM by cheapride »
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1978 cb750f Supersport

Offline bluesmoke69

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Re: 78 cb750f 1st build
« Reply #11 on: November 08, 2011, 07:54:52 PM »
Do yourself a favor and get Hondaman's book it's worth its weight in gold. He a great guy and give money back to the forum.
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Offline cheapride

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Re: 78 cb750f 1st build
« Reply #12 on: November 10, 2011, 06:51:07 PM »
I thought about it but I didn't think the book had a lot of info on the F2.  I still might get it for some extra reading.
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1978 cb750f Supersport

Offline MRieck

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Re: 78 cb750f 1st build
« Reply #13 on: November 10, 2011, 07:32:21 PM »
Quote from: cheapride on November 06, 2011, 06:38:06 PM
bottom case. How much more work is it to remove the transmission?
Not much....pull the shift fork shaft out and lift it out.
« Last Edit: November 10, 2011, 07:34:26 PM by MRieck »
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Offline cheapride

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Re: 78 cb750f 1st build
« Reply #14 on: November 15, 2011, 06:02:10 PM »
I got more work done and am ready to install the gordon frame kit that I bought last year.  I hope to get the cuts done this weekend and the welding done in the next couple of weeks.  I will be getting the frame and other items powder coated in December so I have a little time.  The wires in the headlight were crazy.  I took some pics and hope I can get the back correct.  I know now that I should have labeled the wires before I unplugged them >:(  I am learning stuff all the time.

The battery box was the only thing that had a lot of rust.  I am going to sandblast it and give it a heavy duty paint.  I want to remove the oil breather collector.  I don't know if it does any good or not.  The top hose goes to the air box and the bottom one goes to the engine case. The valve cover vent has a nice filter that you can buy.  Does anyone make something else for the other vents? 

I hope to have the engine cleaned and ready for paint this weekend.  As soon as they are painted I can start to assemble the engine.  My head is getting worked on and the valves and stuff installed.  The jugs are at Cycle x getting bored.  I found out after I removed the jugs that one corner had a broken spot.  Crap.  I never saw it before but now it will be one of the first spots I pick at. 

More to come.
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1978 cb750f Supersport

Offline cheapride

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Re: 78 cb750f 1st build
« Reply #15 on: November 16, 2011, 07:08:41 AM »
I am thinking about replacing the crank bearings.  I see the color green on the bearings.  Do I just order a set of green bearings?
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1978 cb750f Supersport

Offline tweakin

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Re: 78 cb750f 1st build
« Reply #16 on: November 16, 2011, 09:01:03 AM »
Posted in your other thread, also went you a pm with the oil cooler info.

Quote from: cheapride on November 16, 2011, 07:08:41 AM
I am thinking about replacing the crank bearings.  I see the color green on the bearings.  Do I just order a set of green bearings?

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Offline cheapride

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Re: 78 cb750f 1st build
« Reply #17 on: November 17, 2011, 10:07:23 AM »
I had to get a flash light to see the scratches on the crank.  It looks like they are all a's and the case has B's in it so a new set of green bearings will be here shortly.  The battery tray and the oil tank have been blasted and will be primed and painted shortly. 
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1978 cb750f Supersport

Offline cheapride

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Re: 78 cb750f Nickname Silver bullet
« Reply #18 on: December 03, 2011, 06:24:43 PM »
I have gotten a lot of progress done on the bike.  The gordon frame kit was installed and will be welded this week.  That kit was so nice, to bad you don't see it.  I got my head back and soda blasted the engine case.   I was able to get he cases primed and painted along with the oil tank and the battery tray.  Next step will be powder on the frame and finish the engine. 

I am starting on my gauge faces and will be going with a silver to go with the silver and black paint I will be using.  Hopefully my jugs will be ready in the next couple of weeks my head is done and I will be ready to reinstall them.  Here are a couple of shots of the gordon install.
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1978 cb750f Supersport

Offline cheapride

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Re: 78 cb750f 1st build Silver Bullet
« Reply #19 on: December 11, 2011, 06:30:16 PM »
I have got a lot of stuff done on the bike.  I am taking the frame and some other pieces to the powder coater on Friday.  I had a friend weld the gordon in and it turned out ok.  You don't get to see the welds anyway and the powder coating should hide it a little.
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1978 cb750f Supersport

Offline cheapride

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Re: 78 cb750f 1st build Silver Bullet
« Reply #20 on: December 11, 2011, 06:33:51 PM »
I was able to get the engine  painted and the oil pan.  Soda blasted them then primed and painted.  I am going to use powder coated side pieces and some chrome accents.  I can't wait to get the engine's guts in an see the new polished bolts contrast with the new black paint.
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1978 cb750f Supersport

Offline cheapride

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Re: 78 cb750f 1st build Silver Bullet
« Reply #21 on: December 11, 2011, 06:41:26 PM »
I had my head work done by a local buddy.  One of the valve guides was very loose,  the seals were trash too. The port and polish of the intake and exhaust ports look very nice.  I should have taken pics of the before the work to show the difference.  The new springs and retainers look a lot better than the old worn ones.  I had the head soda blasted and primed then painted it with an aluminum paint.  I think the silver will break up the black engine well. 
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1978 cb750f Supersport

Offline cheapride

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Re: 78 cb750f 1st build Silver Bullet
« Reply #22 on: December 11, 2011, 06:42:33 PM »
photos of the deck and the bottom of the valves
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1978 cb750f Supersport

Offline cheapride

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Re: 78 cb750f 1st build Silver Bullet
« Reply #23 on: December 11, 2011, 06:44:51 PM »
some pics of the head primed and then painted.  The masking always sucks but is so nice when it is removed.  The aluminum paint looks great against the black paint.
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1978 cb750f Supersport

Offline cheapride

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Re: 78 cb750f 1st build Silver Bullet
« Reply #24 on: December 11, 2011, 06:49:36 PM »
The gauges  turned out great.  I messed up and broke my first speedo needle.  Ebay had them for $25 so a quick bid and then second chance worked well.  The aluminum vinyl doesn't allow too much light in but I don't drive at night that much.  The needles were painted white and then dipped the tip in red.  I think I am going to get the black surrounds painted when I get my fender and headlight bucket done.  I am not that impressed with the spray can job.
« Last Edit: December 13, 2011, 10:22:39 AM by cheapride »
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1978 cb750f Supersport
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