Topic: Stimulating the Economy (CB750 content)

[coastertrav]

Got a new project with my tax refund, I bought an '76 (we think) Honda CB750 from a friend. The bike is mostly complete, but after being crashed and taken apart by the PO it was abandoned in a garage completely disassembled.

The motor is intact and looks to be in good condition and has great compression, and the frame is straight with little surface rust. It needs front forks, a new front wheel, and a handful of little odds and ends here and there. My goal is to have it back together and running so I can enjoy it in the fall when it gets a little cooler down here.

Mostly looking to go the cafe/rat route with the bike, but it is going to look great when it is all back together.

[mystic_1]

Got a new project with my tax refund, I bought an '86 (we think) Honda CB750 from a friend.

Did you perhaps mean a 76?  The SOHC CB750 was not produced after 1978.

mystic_1

[kghost]

Got a new project with my tax refund, I bought an '86 (we think) Honda CB750 from a friend.

Did you perhaps mean a 76?  The SOHC CB750 was not produced after 1978.

mystic_1

That will stimulate the economy 

The Parts people are waiting...

[coastertrav]

Yeah, I definitely meant '76.

I spent today cleaning up some odds and ends, and dismantling the carbs. Ordering a rebuild kit soon...

[Roach Carver]

f engine? k frame and tank? f front end??

[coastertrav]

f engine? k frame and tank? f front end??

Honestly, I have no idea. It seams like I have a hodgepodge of parts.

It is a K frame, and it had dual disk brakes which would lead me to believe that it is an F front end, but I didn't think they had spoke wheels. The motor I have no clue about, and I honestly didn't know that there is a difference.

[kghost]

f engine? k frame and tank? f front end??

Looks like a K front and a K motor someone painted black.

[Roach Carver]

I am happy to defer to those with more knowledge but the first f models did in fact have spoke wheels. anyway... who cares, its a project. have fun and take a lot of pics.

[coastertrav]

who cares, its a project. have fun and take a lot of pics.

You have no idea, that is what I do.

[mystic_1]

check the crankcase directly in front of the drive sprocket, there's often damage there on these.

I see a bent rim.  Scrutinize the neck carefully, the force of that impact was transmitted up through the forks to the neck area.  Even a couple of degrees of offset will cause you problems.  Tip:  A piece of 1/2 inch conduit fits very nicely down the steering stem.  Mount the rear suspension and wheel, then install the lower triple tree and run the conduit through it, and check it hits the ground in line with the centerline of the bike

Here's a breakdown of models by serial number.  Look up your frame and engine numbers here:

http://www.sohc4.net/index.php?title=CB750K

Finally, post some closer pics of the front-end.  You may have a K front end that's been given the dual disc treatment.  Double-check the identity of your master cylinder too, it may have been changed.

Knowing what you have makes it much easier to get correct parts, and advice

Looks like a good starting point otherwise.  Enjoy!

mystic_1

[goon 1492]

Ooohh it has dual front discs'...I am envious, my 76 750k is half way through that but me's got too order one more fork seal...
Have fun looks like a lot of potential.

[coastertrav]

check the crankcase directly in front of the drive sprocket, there's often damage there on these.

I see a bent rim.  Scrutinize the neck carefully, the force of that impact was transmitted up through the forks to the neck area.  Even a couple of degrees of offset will cause you problems.  Tip:  A piece of 1/2 inch conduit fits very nicely down the steering stem.  Mount the rear suspension and wheel, then install the lower triple tree and run the conduit through it, and check it hits the ground in line with the centerline of the bike

Here's a breakdown of models by serial number.  Look up your frame and engine numbers here:

http://www.sohc4.net/index.php?title=CB750K

Finally, post some closer pics of the front-end.  You may have a K front end that's been given the dual disc treatment.  Double-check the identity of your master cylinder too, it may have been changed.

Knowing what you have makes it much easier to get correct parts, and advice

Looks like a good starting point otherwise.  Enjoy!

mystic_1

Thanks man, excellent info. I'll check some of this out when I get back to the house. I'm on campus right now as the shop here has an amazing parts washer.

[coastertrav]

check the crankcase directly in front of the drive sprocket, there's often damage there on these.

I see a bent rim.  Scrutinize the neck carefully, the force of that impact was transmitted up through the forks to the neck area.  Even a couple of degrees of offset will cause you problems.  Tip:  A piece of 1/2 inch conduit fits very nicely down the steering stem.  Mount the rear suspension and wheel, then install the lower triple tree and run the conduit through it, and check it hits the ground in line with the centerline of the bike

Here's a breakdown of models by serial number.  Look up your frame and engine numbers here:

http://www.sohc4.net/index.php?title=CB750K

Finally, post some closer pics of the front-end.  You may have a K front end that's been given the dual disc treatment.  Double-check the identity of your master cylinder too, it may have been changed.

Knowing what you have makes it much easier to get correct parts, and advice

Looks like a good starting point otherwise.  Enjoy!

mystic_1

Thanks again for the tips.

I checked out the crankcase, and all is well, no holes. I would however like to get the drive sprocket off of there, any hints?

The frame is a 76 (K6), and the motor is also a K6. The neck of the bike seems to be straight, but as soon as I get the rear tire on there I will check the alignment.

I'll get some closer pictures of the front end, and maybe you guys can help me identify it.

[J.Webster Designs]

fellow florida guy.... I am up here in gainesville at UF. I saw the UCF plate on the miata..... there are a few of us from florida around here. i think sometime we should all get a florida meet somewhere.

[Roach Carver]

to take off the front sprocket there are two bolt holding it on. pretty simple job.

[coastertrav]

fellow florida guy.... I am up here in gainesville at UF. I saw the UCF plate on the miata..... there are a few of us from florida around here. i think sometime we should all get a florida meet somewhere.

Yeah, that would be awesome.

I'll probably be driving the Miata though, as I don't see this project getting finished anytime soon, which is good. I picked up the bike because the Miata is at a point that I almost consider finished.

[754]

My cat said to ask what you smoke, & said it is definitely a K fork.
 The headlite ears look like 72,s The part of the front brake that mounts to the fork9that holds the swinging part), is either C shaped or T shaped
 c shaped is 72, T is 73 - 76.

[BeSeeingYou]

The front fork is not from an F model.  The headlight brackets and fork gaters are a giveaway.

[coastertrav]

Not that it really matters since it is being replaced anyways.

[coastertrav]

So, I'm not going to lie, this project kinda got pushed aside for awhile.

But, the other day while cleaning the garage, it found new hope. I'm going to do the unthinkable and scrap the stock 750 and downgrade to a 600cc. I just am not sure about the condition of the 750, and I would hate for this bike to be full of headaches.

So here is the little 600 that I know will run...
















Oh yeah, I forgot to mention, the little motor that could is out of a '07 Suzuki Gsxr. It has a full wiring harness, ecu, and less than 4k on it. I know I know, ambitious, but when you work with a bunch of guys who built a race car from the ground up, shoeing this thing in should be no problem, and I get to get rid of those god forsaken carbs.

Next to it's new home.



And from the back. I need to finish stripping the frame, but a handful of parts have already been cleaned up and primered.

[Chippy569]

you must be on a formula SAE team.  Does your team run an F4i as well?

Do you autox your miata? if not you totally should!

Oh, the gsxr swap will definitely be interesting.

[coastertrav]

you must be on a formula SAE team.  Does your team run an F4i as well?

Do you autox your miata? if not you totally should!

Oh, the gsxr swap will definitely be interesting.

Yeah, UCF FSAE.

We run the F4i as well, and were looking at switching to this motor but due to having a few F4i motors laying around we are just going to stick with that. Lucky for me that means we have no use for the Gsxr motor...

And I have autox'd the Miata, just not with the turbo yet. Still fixing some bugs with it.

[Chippy569]

hahaha awesome. I go to school up in Michigan Technological Uni and while I'm not on the FSAE team there, I did do some video production for the team.

I also autox my grand prix. it's an unlikely candidate and it does really #$%*ty but i still love doing it anyway.

[DollarBill]

Oh....you are going to have some new headaches for sure with that transplant!  The engine may run fine but lining it all up and mounting it will be every bit as much...or more....of a headache than getting any stock cb750 motor going.  Definitely interesting though...I'll be watching this one.  Good luck.

[754]

Man... and you thought fixing the 750 was going to be work..LOL..

 Its gonna be more work fitting that engine, than you would have had to do to the 750..

 Have you ever opened a CB 750 up?.. one of the only engines I have seen that you can re &re every part in the engine, with 2 fists full of tools. Truly one of the easiest motors to work on..

[coastertrav]

Man... and you thought fixing the 750 was going to be work..LOL..

 Its gonna be more work fitting that engine, than you would have had to do to the 750..

 Have you ever opened a CB 750 up?.. one of the only engines I have seen that you can re &re every part in the engine, with 2 fists full of tools. Truly one of the easiest motors to work on..

Meh, maybe it would be difficult for you, but working in a garage is a little bit different then working in a full machine shop. So I might have to move a few bars around and make new motor mounts, but really that seems way easier to me than to try and get the questionable 750 running.

Have you ever tried to get a fuel injected motor started for the first time? I can tell you that it is way easier than trying to get a 33 year old carbed motor idling.

[754]

I am in & out of  the machine shop, at least 6 days a week.. great for bike work, but lacking in bending equipment(not for long) and welding equipment.


 your project, best idea to get out of carb cleaning, that I have ever seen.

[coastertrav]

I am in & out of  the machine shop, at least 6 days a week.. great for bike work, but lacking in bending equipment(not for long) and welding equipment.


 your project, best idea to get out of carb cleaning, that I have ever seen.

haha, yeah, I'm more handy with a laptop than with setting jets. I should clarify, the machine shop I am speaking of is a full on fabrication facility where we turn out things like this:

Me driving BTW

[DollarBill]

Man that looks like a fun little beast!  I wish I had access to a shop like that!

[754]

So will it be a YAMONDA..or a HONAHA..

[DollarBill]

I think it will be a HONDUKI since it is a Suzuki GSXR motor 

[cafeconleche]

This project looks very interesting, can't wait to see the outcome.