Author Topic: Two '77 CB750K projects  (Read 161 times)

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Offline onepieceatatime

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Two '77 CB750K projects
« on: March 21, 2019, 11:56:23 pm »
I suppose I should record my progress.
I bought 2 non-running, titled '77 CB750Ks and part of a K5 for $500.
I intend to work on both of these at the same time, and hopefully within the next 2 years have them on the road.
All 3 engines were stuck, I got the 2 '77s freed up with ATF/acetone and rocking the bikes in gear. The first one shot the ATF/acetone at least 15 feet across the garage and covered 3 other bikes with it. I figured out that I should put rags over the spark plug holes on the other one.
The one missing the exhaust, unfortunately the valves are not moving either, so that engine is going to have to come apart, and it will likely get an 836 kit in the process. That engine has already been apart at some point so I am curious to see what is in there.







All of this was included in the sale




« Last Edit: March 22, 2019, 12:22:00 am by onepieceatatime »
1977 CB750K
1977 CB750K
1978 CB400A
1980 CB650C
1980 CB650
1982 CB900F
1982 CM450A
1997 GL1500SE

Offline onepieceatatime

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Re: Two '77 CB750K projects
« Reply #1 on: March 22, 2019, 12:02:14 am »
The grey bike had the bags and fairing on it when PO bought it, but he took them off. I plan on putting them back on, but may use another fairing that I have.
I have gathered a few other parts, and several rebuild kits, but know I need a few more rebuild kits that I have not bought yet.
The other fairing:

I want to remove the comstar wheel and put these on:


and one of these tanks:


and this Corbin-Gentry seat that I bought for it:
1977 CB750K
1977 CB750K
1978 CB400A
1980 CB650C
1980 CB650
1982 CB900F
1982 CM450A
1997 GL1500SE

Offline onepieceatatime

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Re: Two '77 CB750K projects
« Reply #2 on: March 22, 2019, 12:10:45 am »
The air-brushing was done by a place called Vantastics in Carlisle, PA (it is signed). This is the one that will have to have the engine torn apart, and will likely get the 836 kit. It has 6" oversized forks with a fork brace, but  they are bad, so I got some new stock size fork tubes for it. It also has Lester wheels which I plan to keep on it.
I need an exhaust for it still. I either want to find a factory exhaust for the grey bike and use its headers and these NOS Jardines on the black one, or find some other period correct aftermarket exhaust to go on it.

This bike is getting this Corbin-Gentry seat:

some finned engine covers:

and probably these floorboards and highway pegs:

The speedometer is messed up so it will probably get some '75 gauges.


And the other set will go on the grey bike to replace the DOHC gauges that are on it now.
 
1977 CB750K
1977 CB750K
1978 CB400A
1980 CB650C
1980 CB650
1982 CB900F
1982 CM450A
1997 GL1500SE

Offline onepieceatatime

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Re: Two '77 CB750K projects
« Reply #3 on: March 23, 2019, 06:14:27 pm »
Before I spend any money on new spokes, can anyone confirm that the front wheel from a '76 CB550 and the rear wheel from a CB750K5 will fit the K7? I know I'll have to switch to a 630 sprocket on the rear, but otherwise will it all work?
1977 CB750K
1977 CB750K
1978 CB400A
1980 CB650C
1980 CB650
1982 CB900F
1982 CM450A
1997 GL1500SE

Online seanbarney41

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Re: Two '77 CB750K projects
« Reply #4 on: March 23, 2019, 08:41:02 pm »
On the back, you have to keep the k7 sprocket carrier with the k7 engine so that front and rear sprockets align...use the k7 wheel spacers with that too.
If it works good, it looks good...

Offline onepieceatatime

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Re: Two '77 CB750K projects
« Reply #5 on: March 23, 2019, 10:13:18 pm »
On the back, you have to keep the k7 sprocket carrier with the k7 engine so that front and rear sprockets align...use the k7 wheel spacers with that too.

Thank you. will the one from the comstar fit the spoke wheel?
1977 CB750K
1977 CB750K
1978 CB400A
1980 CB650C
1980 CB650
1982 CB900F
1982 CM450A
1997 GL1500SE

Online seanbarney41

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Re: Two '77 CB750K projects
« Reply #6 on: March 23, 2019, 10:27:53 pm »
On the back, you have to keep the k7 sprocket carrier with the k7 engine so that front and rear sprockets align...use the k7 wheel spacers with that too.

Thank you. will the one from the comstar fit the spoke wheel?
yes it should, as long as the comstar is from a 77/78 cb750f..but you do know that the k7 never came with comstars?
If it works good, it looks good...

Offline onepieceatatime

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Re: Two '77 CB750K projects
« Reply #7 on: March 23, 2019, 10:33:59 pm »
On the back, you have to keep the k7 sprocket carrier with the k7 engine so that front and rear sprockets align...use the k7 wheel spacers with that too.

Thank you. will the one from the comstar fit the spoke wheel?
yes it should, as long as the comstar is from a 77/78 cb750f..but you do know that the k7 never came with comstars?

Yeah, that's why I want to get them off of it. I have no idea what the comstars are originally from.
1977 CB750K
1977 CB750K
1978 CB400A
1980 CB650C
1980 CB650
1982 CB900F
1982 CM450A
1997 GL1500SE

Online seanbarney41

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Re: Two '77 CB750K projects
« Reply #8 on: March 23, 2019, 11:03:39 pm »
okay, I went back and looked at your pics of the grey bike...that rear wheel is what as known as a reverse comstar.  It came on certain 79 and later dohc4's, certain models of sohc 650, and some honda twins...so no idea if that sprocket carrier will work or not
If it works good, it looks good...

Offline onepieceatatime

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Re: Two '77 CB750K projects
« Reply #9 on: March 23, 2019, 11:13:23 pm »
okay, I went back and looked at your pics of the grey bike...that rear wheel is what as known as a reverse comstar.  It came on certain 79 and later dohc4's, certain models of sohc 650, and some honda twins...so no idea if that sprocket carrier will work or not


Thanks for checking. I guess I'll figure it out when I get to that point. The reverse comstars might end up as spares for my 650, if they will work for that. Either way I want to have spokes on the K7.
1977 CB750K
1977 CB750K
1978 CB400A
1980 CB650C
1980 CB650
1982 CB900F
1982 CM450A
1997 GL1500SE

 

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