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Author Topic: 1969 CB750 donor bike  (Read 2059 times)

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Offline ianglean

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1969 CB750 donor bike
« on: May 02, 2016, 10:37:44 PM »
I am restoring a 69 CB750 that needs a ton of parts. I might be able to get my hands on a running 1978. Will that work as a donor bike? Do they have the same engine and will the internals, carbs and electricals interchangeable?

Thanks.
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Offline evanphi

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Re: 1969 CB750 donor bike
« Reply #1 on: May 03, 2016, 10:08:13 AM »
A 69? You sure? Have you cross-checked the VIN's to see if it is a sandcast?

Also there's lots of stuff on a 78 that is not compatible.

Electrical should be pretty close... but carbs will be totally different.
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Offline CycleRanger

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Re: 1969 CB750 donor bike
« Reply #2 on: May 03, 2016, 10:15:29 AM »
'78 engine output shaft is slightly longer, requires using some of other '78 parts.
You can search the forum for more info about using a 77-78 engine in a '76 or earlier bike.

Other most noticeable difference would the carbs, as mentioned.  However, earlier carbs will work fine on a 78 engine.
Short answer, for easier compatibility look for a '76 or earlier bike.
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Offline flybox1

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Re: 1969 CB750 donor bike
« Reply #3 on: May 03, 2016, 10:18:34 AM »
What is the VIN on the frame?
It just might be that the frame can fund a complete rebuild of another bike  ;)
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'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

Past Bikes
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Offline Don R

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Re: 1969 CB750 donor bike
« Reply #4 on: May 03, 2016, 10:26:40 AM »
 Stop and check the numbers, a 69 has value you don't want to ruin by swapping off it's parts. It might be wise to sell it and use the money to buy a better bike or find another K0 for parts.
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Offline jamesw

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Re: 1969 CB750 donor bike
« Reply #5 on: May 03, 2016, 11:48:45 AM »
Quote from: Don R on May 03, 2016, 10:26:40 AM
Stop and check the numbers, a 69 has value you don't want to ruin by swapping off it's parts. It might be wise to sell it and use the money to buy a better bike or find another K0 for parts.

What he said. If it needs a "ton of parts" you might as well sell it and buy another project. A 69 isn't ideally the year you want to be mismatching together. I'd definitely confirm by the VIN that's it's a 69 though.
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Offline ianglean

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Re: 1969 CB750 donor bike
« Reply #6 on: May 03, 2016, 01:03:26 PM »
Frame and engine both starts 101xxxxx.
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Offline flybox1

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Re: 1969 CB750 donor bike
« Reply #7 on: May 03, 2016, 01:09:32 PM »
Within the first 20,000 produced. Early, but not Sandcast.

CB750     1969/70         1969 – 1970           E1000001   1000001
CB750 K1   1971   Aug 1970 – Nov 1971   E1053399   1044806
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'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

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
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"Knowledge without mileage equals bullsh!t" - Henry Rollins

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Offline Johnie

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Re: 1969 CB750 donor bike
« Reply #8 on: May 03, 2016, 01:16:11 PM »
Take a look on the steering neck at the build tag. Should be a month and year on there like 10/69 in the corner. What does it say? Post up some pics for us. We salivate for pics :) Welcome to the board!
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Offline ianglean

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Re: 1969 CB750 donor bike
« Reply #9 on: May 03, 2016, 01:34:09 PM »
Engine number is 1012329. Frame is not here as of the moment. Now i am starting to get chills lol. How much are we talking about here?  :-\
« Last Edit: May 03, 2016, 01:37:05 PM by ianglean »
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Offline flybox1

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Re: 1969 CB750 donor bike
« Reply #10 on: May 03, 2016, 01:41:44 PM »
Quote from: ianglean on May 03, 2016, 01:34:09 PM
Engine number is 1012329. Frame is not here as of the moment. Now i am starting to get chills lol. How much are we talking about here?  :-\
Nothing, really.  Sorry.
Its an early frame and engine, but as I said above, its not withing the Sandcast run.

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'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

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline greenjeans

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Re: 1969 CB750 donor bike
« Reply #11 on: May 03, 2016, 01:45:43 PM »
Early "diecasts" have more value than the later ones.   Take some photos and post them up.  We can figure out a better gameplan than using a 78 for parts.   
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Offline ianglean

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Re: 1969 CB750 donor bike
« Reply #12 on: May 03, 2016, 02:00:43 PM »
Oh. I can continue to hack the frame  :P almost made me run to the shop and shout stop.

Frame is in the shop now and it might be cheaper if i can get a donor bike than ordering parts online. The 78 is in running condition but without papers. Got the 69 not running wires a mess so practically just a frame and engine
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Offline flybox1

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Re: 1969 CB750 donor bike
« Reply #13 on: May 03, 2016, 02:08:19 PM »
why hack a titled frame? :o
probably someone on here who would take an early diecast frame.
what state are you in?  Vermont registration might be the way to go with your '78
« Last Edit: May 03, 2016, 02:10:49 PM by flybox1 »
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'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

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline greenjeans

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Re: 1969 CB750 donor bike
« Reply #14 on: May 03, 2016, 02:13:22 PM »
69 will have different oil tank and side covers.  Rear fender and light is different. Seat is different.  Wiring harness, while similar, will have more stuff.  Handlebar, gauges, mirrors, seat, forks and front brake, caliper and bracket, and controls are different.  Basically, lots of differences.   Can you use the parts off a running 78 ?   Absolutely.  Its just that if you are restoring it, a good restored/complete 69 will bring 2-3 times as much as a 69 combined with your 78.

If you have a good 69 frame and  69 motor to go with it, you might be better off selling it and finding another to piece together.   You might be suprised what people would pay for a 69 vs a 75 etc.  Have you hacked the frame yet ?

I'd be interested in it, depending on where you are.
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Offline ianglean

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Re: 1969 CB750 donor bike
« Reply #15 on: May 03, 2016, 02:17:38 PM »
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Offline ianglean

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Re: 1969 CB750 donor bike
« Reply #16 on: May 03, 2016, 02:23:38 PM »
Unfortunately im from the Philippines and you cant find parts here to do a back to original restoration.
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Offline ianglean

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Re: 1969 CB750 donor bike
« Reply #17 on: May 03, 2016, 02:25:03 PM »
Out of curiosity did i pay too much for 600usd?
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Offline Don R

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Re: 1969 CB750 donor bike
« Reply #18 on: May 03, 2016, 02:30:40 PM »
 There's a higher number frame and engine on ebay for $1500
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Offline ianglean

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Re: 1969 CB750 donor bike
« Reply #19 on: May 03, 2016, 02:37:45 PM »
Got it. Thanks.
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