History of the 69-78 CB750

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robin1731
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Re: History of the 69-78 CB750

#16

Post by robin1731 »

Don R wrote:Thanks Wingnut, that article answered a question I had on valve guide honing. No one on the sohc4 site could tell me that a 6mm hone is used after the .259 reamer on a 750 valve guide. I'm going to bookmark that one.
Just hone/ream the guide to get the correct stem to guide clearance. Once that is set then do the valve seats.

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1976 Goldwing Super Sport
1985 Honda Elite
1976 KZ900 Dragbike
1992 ZX7 Dragbike (KZ900 style motor w/NOS)
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calif wingnut
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Re: History of the 69-78 CB750

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Re: History of the 69-78 CB750

#18

Post by Don R »

Right. I have the reamer, I just needed the correct hone. Due to a mistake on my part I bought a 5.5mm hone which of course is too small for stock valve stems. Correct for 5.5mm kibblewhite high performance valves, however I don't have any.

I bought a very early Sandcast head with new guides except one had a bent exhaust valve stuck in it hard. I broke the guide removing it and replaced the one. The new one was tight even on a used exhaust. The new exhaust valve stems are slightly smaller in diameter than the intakes.
78 GL 1000, 70 CB750 sandcast, 70 CB836 hot rod, 1124cc 750 dragbike resto project.
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Re: History of the 69-78 CB750

#19

Post by Don R »

Image

The first cb has a gl front fender, there are two gl1000 in the pic the rest are from the two 750 collections I stumbled over last fall. I have history with most of them, doing work on them for my brother.

The red one is a sandcast 750, on the right is a 74,75,72,and a 77 F/K hybrid we call the F'nK. With the brown 71, a 76 and a 73 parts bike and the 70 in my trailer I have every year from 69 through 77. Most don't run but all have titles. I bought 6 from a guy really cheap and 3 from my brother reasonable. Then the guy I got the 6 from sold me his 78 wing at a gift price because he knew I'd take care of it.
I sold two cb400F's, a one owner 74 cb750 and a cl100 then used the money to buy these bikes. Not sure if I came out ahead.
78 GL 1000, 70 CB750 sandcast, 70 CB836 hot rod, 1124cc 750 dragbike resto project.
You don't need a weatherman to know which way the wind blows.
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Re: History of the 69-78 CB750

#20

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Re: History of the 69-78 CB750

#21

Post by calif wingnut »

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Re: History of the 69-78 CB750

#22

Post by sunnbobb »

Nice collection Don, glad someone is saving them for me! LOL
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1978 Learning Experience
1980 County Road Hauler "Brain Damage"
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Re: History of the 69-78 CB750

#23

Post by calif wingnut »

My ole high school buddy whom just gave his 74 750 busted resto project, was the only one that bought a new 750 in 72 for $1,300 otd. The rest of us bought 650 yamaha's ($1,313 otd) because the 750 had too many carbs but within a few years, we all owned 750's HA.

Here's a few pictures of my 74 that threw a chain at some point and had the case welded.
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case weld repair.JPG (107.35 KiB) Viewed 490 times
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IMG_0372.JPG (132.22 KiB) Viewed 490 times
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IMG_0376.JPG (112.63 KiB) Viewed 490 times
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IMG_0382.JPG (126.57 KiB) Viewed 490 times
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Re: History of the 69-78 CB750

#24

Post by Don R »

I have the Ibikes style dropout frame piece. My 70 was already hacked out and took a wrecked bike to provide a few parts to put the lower tubes back in. It's a hot rod motor and when I managed to bend a valve it was nice to pull the head with the engine in the frame. I did a cam swap too, I went from a 77 Honda F cam to A Kenny Harmon road race (F) cam. The head is ported and it has an 836 kit with a no name copy of a late Yoshimura header.
It had Lester mags on when I got it and right now has a fibermold gas tank and drag race seat. I plan to return it more to original with it's original wrinkle tank and candy blue green paint.
78 GL 1000, 70 CB750 sandcast, 70 CB836 hot rod, 1124cc 750 dragbike resto project.
You don't need a weatherman to know which way the wind blows.
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Re: History of the 69-78 CB750

#25

Post by Don R »

Image

Image

The top bike is the first cb750 sold at Grand Motor Sales here and the lower bike is probably the third, 1-2-and 3 are each about 4,000 serial numbers apart with the top one being a sandcast bike and the other one made 11/69.
The lower bike is wearing the trim from my 750 based drag bike, it's 1124cc missing a lot of it's race parts but I do have the engine.
78 GL 1000, 70 CB750 sandcast, 70 CB836 hot rod, 1124cc 750 dragbike resto project.
You don't need a weatherman to know which way the wind blows.
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Re: History of the 69-78 CB750

#26

Post by calif wingnut »

What a collection you have Don :-)

Craigslist 750 calif ads

Stunning "Slightly Modified" 750 https://sacramento.craigslist.org/mcy/6069177505.html

1977 Super Sport https://sfbay.craigslist.org/sfc/mcy/6065849131.html Note the black caps over the Comstar rivets.

Tracy fiberglass kits http://vintage-and-classic-honda-s.4567 ... 03012.html
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