Topic: 1976 CB750 Build guidance please.

[Hotwheelbill]

So, I was given this 1976 (11/75 build date) CB750. Complete but dropped on left side and poor patch on engine cover....fix that later. Last ran 2 yrs ago and before that several yrs. Tank looks nice outside, inside has a bad Kreem fix attempt. All in the bottom now. Carbs are stuck open, cable maybe. It does turn freely. 10873 miles.
So, Am I right in my thinking......
1) Pull and rebuild carbs.
2) Tank tank to rad. shop and have them strip and fix leaks in tank. (paint is no good anyway).
3) Go ahead and order Dyna electonic ignition , coils, wires and be done with that! If all else, I keep for another day.
4) Fire it up and then go to town with the tear down.

I have never had even a head off of a bike. I am sure I can, but have not as of today. Oh, wait, there was that DR650......LETS MOVE ON!
So, I would think with a bit of seafoam and new oil changes a few times in few hours of running would be ok for a 10k motor that has been ...kind of sealed up. 
Fire away!

[Davez134]

Absolutely completely clean carbs and get that tank cleaned out, great first choices. My suggestion is before you spend the money on all that ignition stuff, test what is on there now, do the tune up procedure per shop manual available here and see how she runs. My guess is if it was sealed up, no water got in anywhere and that low mileage, it should run good. But, get it running good then decide what you want to "upgrade."

[calj737]

And you don't need to take the tank to a radiator shop, Acetone or MEK will strip that liner out lickety-split!

[HondaMan]

If you

So, I was given this 1976 (11/75 build date) CB750. Complete but dropped on left side and poor patch on engine cover....fix that later. Last ran 2 yrs ago and before that several yrs. Tank looks nice outside, inside has a bad Kreem fix attempt. All in the bottom now. Carbs are stuck open, cable maybe. It does turn freely. 10873 miles.
So, Am I right in my thinking......
1) Pull and rebuild carbs.
2) Tank tank to rad. shop and have them strip and fix leaks in tank. (paint is no good anyway).
3) Go ahead and order Dyna electonic ignition , coils, wires and be done with that! If all else, I keep for another day.
4) Fire it up and then go to town with the tear down.

I have never had even a head off of a bike. I am sure I can, but have not as of today. Oh, wait, there was that KLR650......LETS MOVE ON!
So, I would think with a bit of seafoam and new oil changes a few times in few hours of running would be ok for a 10k motor that has been ...kind of sealed up. 
Fire away!

If you get Dyna coils with their Dyna S ignition, get their 5-ohm coils. Using their 3-ohm coils and the Dyna S together will ensure that your battery will always be 2/3 charged, and the electric start won't work. Also, don't forget to also buy new sparkplug caps in the 5000 ohm (5K) type, part numbers SD05F and VD05F. I recommend the ND sparkplugs #X24ES-U with that bike, too.

[seanbarney41]

100%...just fix what needs it and run that engine.  Especially considering that you are inexperienced....these engines are not cheap or easy to rebuild.

[Hotwheelbill]

Thanks everone for some good advice.
I will am going to cut my CB650 build short after the carbs are rebuilt and sell to fund this one. So, I will prob go ahead with the Dyna and if it all goes to s@@@ I will shelf it for the next...CB750.
Hondaman, thank you for your advice and will do!
I may do the tank myself, but told it has a leak and that was why the Kreem was used.
Month or so away, so many questions to come.

[70CB750]

There are other ignitions available:

http://sohc4shop.com/catalog/product_info.php?manufacturers_id=12&products_id=32&osCsid=19dc71a7b3737b11db0574e80cb5300e

http://www.cb750ignition.com/

Used by many with excellent results.

[Hotwheelbill]

There are other ignitions available:

http://sohc4shop.com/catalog/product_info.php?manufacturers_id=12&products_id=32&osCsid=19dc71a7b3737b11db0574e80cb5300e

http://www.cb750ignition.com/

Used by many with excellent results.

Humm , reading up on this. Thank you.

[Hotwheelbill]

ftp://Did not plan on this so soon, but for $350 , Im going to get it in a few.  2004 GSXR 600 FRONT END.

[SOHC4 Cafe Racer Fan]

Nice donor front.  Stock GSXR wheels or an adapted spoke wheel from a Cognitomoto hub or machined spacers?

[Hotwheelbill]

Nice donor front.  Stock GSXR wheels or an adapted spoke wheel from a Cognitomoto hub or machined spacers?

Not a clue.  A little too soon for this item, but it comes with brakes , wheel , fender, bars....My just start with this wheel for now. Well the rear wheel from a GSXR600 work on the CB750?

[Hotwheelbill]

Nice donor front.  Stock GSXR wheels or an adapted spoke wheel from a Cognitomoto hub or machined spacers?

Also, anything else I can use off this bike while Im there? shifter, brake??

[SOHC4 Cafe Racer Fan]

Steering damper and possibly the rear sets (I have seen people weld mounting brackets to adapt them to fit).

[calj737]

Nice donor front.  Stock GSXR wheels or an adapted spoke wheel from a Cognitomoto hub or machined spacers?

Not a clue.  A little too soon for this item, but it comes with brakes , wheel , fender, bars....My just start with this wheel for now. Well the rear wheel from a GSXR600 work on the CB750?

With a little work, you can adapt the rear swing arm and stock gsxr wheel to the rear, and the entire front end (swap the steering stem) onto the CB. If you desire-

[Hotwheelbill]

Nice donor front.  Stock GSXR wheels or an adapted spoke wheel from a Cognitomoto hub or machined spacers?

Not a clue.  A little too soon for this item, but it comes with brakes , wheel , fender, bars....My just start with this wheel for now. Well the rear wheel from a GSXR600 work on the CB750?

With a little work, you can adapt the rear swing arm and stock gsxr wheel to the rear, and the entire front end (swap the steering stem) onto the CB. If you desire-

Thanks guys for the info/input. I will use the new shaft for front end swap. Not real crazy about the rear GSXR swing arm. So, looking at a CBR rim mayby with a CB550 arm.

[Hotwheelbill]

BTY, did not go to pick it up yesterday. Seller is pulling it today and going to call me. Better pics later.

[calj737]

Wish I had known yesterday you might want a 550 arm. I have an extra, and I drove to FL last night. I could have delivered it to you today 

If you do use a 550 arm (it's a good idea on a 750 because they're at least 1" longer) the only trick will be to insure the gsxr axle and 550 hub are compatible. And of course the sprocket on the drive side will need to align with the front (perhaps a slightly custom width axle spacer). I like your plan. And of course, a caliper bracket on the brake side needs to be fashioned for the tie to the swing arm.

[Hotwheelbill]

Wish I had known yesterday you might want a 550 arm. I have an extra, and I drove to FL last night. I could have delivered it to you today 

If you do use a 550 arm (it's a good idea on a 750 because they're at least 1" longer) the only trick will be to insure the gsxr axle and 550 hub are compatible. And of course the sprocket on the drive side will need to align with the front (perhaps a slightly custom width axle spacer). I like your plan. And of course, a caliper bracket on the brake side needs to be fashioned for the tie to the swing arm.

Auh man. Yeah would have been nice.
Thanks.
I still need to clean carbs and get her fired up....soon.

[Hotwheelbill]

Question.
In looking for a frame with a title for my 1976 CB750K, I have come across a 77 Hondamatic frame about 3 hours away. Any reasons to use/not use, this frame?

[calj737]

Over in the For Sale section, jsedacca is selling a bunch of 750 stuff. I was by his place this am and noticed a frame. Maybe contact him? He's in Tampa area

[Hotwheelbill]

Picked it up today. Less a couple things, but still good for price.

[SOHC4 Cafe Racer Fan]

That front looks relatively clean and you got the brakes too. Score.