1979 CB750 project bike Step 1 Rebuild Motor

[fire101]

Hey guys I am brand new to this new found passion and i picked up this bike and i want to bore it out. What kits do you suggest?
I also love the flat black motor and pipes.
Do you use any heat resistant paint?

[TOOLS1]

Bike looks nice. Cycle-X has an overbore kit, and I have seen some cheaper on e-bay. However the DOHC will not bore out as large as a SOHC. As, for paint, I use acrylic enamel automotive paint on my engines. If your engine gets hot enough to burn it off, you need a new engine. I do use an engine enamel on the pipes though.
TOOLS

[shinyribs]

I may be plum wrong,so dont get excited-But I think you can use the jugs and head off a 900 and it will go right on your engine. I know the cranks do NOT interchange(900 has more stroke) without extreme machine work. Not sure how much more that will get ya. Half-caf had a thread on here with alot of good info about the DOHC not long ago. Can't remember what it was called (his thread). You might use the serch function to see if you can find that thread.

[Half-Caf]

You could not throw the 900 jugs on the 750 without the longer crank or the compression would be shot (900 has a longer stroke)
Oh, and you couldn't pop in the crank unless you has your crankcase machined to accept the larger 900 sleeves

[Half-Caf]

Here's the link to my thread for your browsing pleasure!

[shinyribs]

Well,howdy stranger! Thanks for chiming in and straightening me out

[Half-Caf]

Yeah, bet you thought you were rid of me, eh?
I need to post an update of my own soon.

Fire, looking forward to what's ahead!

[fire101]

Thanks For all the help. I am currently looking up parts and trying to part out my other bike to get me some spending money. I found this kit It is a 1mm OVER BORE KIT
to suit the following models:
Honda CB750F DOHC
Honda CB750KZ 1979 DOHC
Kit includes
4 x 63mm Pistons
4 x Sets of Rings
4 x Piston Pins
8 x Piston Clips
1 x Complete Engine Gasket Set

Is this a good Size and what would be an average price on one of these?

I am trying to keep this project in a cheap budget but not sacrifice to much quality.
Also i really like the pods but have read somethings saying it messes up the Carbs and the bike doesnt run as good. But they look so good and it would be nice not to have to fight the air box any more.

Does anyone Know how the DOHC does with Pods?

[fire101]

Another Question i have a Dent the size of a fist in my gas tank and i wanted to pull it out with minimal invasive methods. What are my options?

[Hellbilly429]

Drain the tank, take the petcock off and put the gas-cap on and put air to the tank. If it doesn't come out easily you can tap around the dent with a rubber mallet or something similar (so you don't dent and scratch the tank).

[fire101]

Hey thanks for the Gas tank advise!
Well i am finally moving forward on this project. I have ended up getting the over sized bore kit and i just put my piston on and got then into the jugs. I also ended up having a recharge problem so i just bought the whole kit with stator, rotor, charging circuit, and it came with a free battery indicator.
And while i have everything out of the frame i had it sandblasted and painted. The best part was it was free!! Thanks to an awesome brother in law. Who said in-laws were hard to get along with?! :)
I do have some questions on The front brake caliper. It seems like the cylinder get stuck and wont retract. Any ideas on cheap fixes? i hope i dont have to rebuild it. But I want it to be safe.
Also does anybody know if you can switch frames between a 1979 cb 750 and a 1979 cb 750k?
 Thanks for all the help this forum has been great!

[seestheday]

For your front brake calliper, did you squeeze the brake with the wheel off and now it doesn't want to retract?  If so, you can just get a flat piece of metal and push it back in, you just have to push really hard to force it back.  If it's sticking badly on the brake then someone else will have to chime in.

Are you still thinking of getting pods?  I've heard that they can work with a lot of dialing in, but it will never run as well had you set it up with the airbox.  Since you're thinking about doing an over-bore you seem to be more performance oriented, so going with either upgraded carbs ($) or the stock airbox would be my recommendation.

As for switching the frame, the 1979 cb750 has to have some sort of letter designation.  It's either a K, F or C.  I don't believe there were any major differences in the frames of the letter models, and it might just be another K (K was the base/economy model).

Also, are you planning on dropping in 900 cams?  I just picked some up and will be putting them in my bike.

[seestheday]

I just looked at the pic you posted.  Your bike is a "C" model.  

[fire101]

Ya it is sticking on the the wheel. I am thinking i might have to rebuild since the master cylinder but i will play around with it and see what i can do.
I was going to put 900s on but heard yoy had to do some custom work to make them work. Or do they just fit right in?

On Jan 31, 2013 9:55 AM, "seestheday [via Honda CB750'S]" <[hidden email]> wrote:

For your front brake calliper, did you squeeze the brake with the wheel off and now it doesn't want to retract?  If so, you can just get a flat piece of metal and push it back in, you just have to push really hard to force it back.  If it's sticking badly on the brake then someone else will have to chime in.

Are you still thinking of getting pods?  I've heard that they can work with a lot of dialing in, but it will never run as well had you set it up with the airbox.  Since you're thinking about doing an over-bore you seem to be more performance oriented, so going with either upgraded carbs ($) or the stock airbox would be my recommendation.

As for switching the frame, the 1979 cb750 has to have some sort of letter designation.  It's either a K, F or C.  I don't believe there were any major differences in the frames of the letter models, and it might just be another K (K was the base/economy model).

Also, are you planning on dropping in 900 cams?  I just picked some up and will be putting them in my bike.

1981 CB750K with 900 cams

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[seestheday]

For the 900 cams, I've heard that most just drop in, but in some cases you need to ground out a little bit of the cylinder head for them to work.  Not precision work, just so you have clearance.  Apparently you can use a dremel.

[fire101]

Hey does any one know if there is any cheaper substitutions oil filter or air filter that you can use?  

[Hoosier Daddy]

seestheday wrote

I just looked at the pic you posted.  Your bike is a "C" model.

The pic I see is a 79 LTD... basically a K with lipstick

[seestheday]

Shoot, you're right. Do I also see a Sega flight sim in the background?