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Author Topic: CB750K - First Build  (Read 12885 times)

Offline ShaggyPit

  • Posts: 104
CB750K - First Build
« on: Dec 02, 2014, 00:50:29 »
Hey guys,

So back in the summer I started to really look into building a cafe racer style bike.  I had no idea how broad that "description" turned out to be and then the variations such as bobbers and trackers and brats.  I found this site and starting cruising the builds and enjoyed each style and each build I looked at.  A small fire started burning inside me and I decided that I would try to find some cheap bike with the intentions of turning it into something that is at least a fraction of the coolness of many of the builds I have seen on here.

So being in my final year at university, I wasnít willing to spend too much money on a bike and started scouring the local craigslist for a cheap bike.  I had no idea what models were good for what style and started to do some research.  Although I started riding a Ninja about 3 years ago, I am not the most mechanically adept person there is, but not afraid to get my hands greasy.  I did basic stuff on the Ninja but never really took the time to learn the core of the bike and the process the engine goes through along with carbs and all that fun stuff.  Anyways, I finally found a cheap cb750 and after seeing it a couple times was able to talk the guy down on the price a bit where I felt comfortable that if I had to pull the plug on the project I could (hopefully) regain my money or most of it at least.

Now the bike did run, shifted, and rolled nicely.  Wasnít too sure how well it was running but it sounded as if it were in decent condition for its age.  The guy stored it in an underground garage so it was nice and dry but still had some surface rust and tons of grime everywhere.  But for my first project, I wasnít too worried if it was a beater because I am sure I will be messing something up on it.  The gas tank had a dent in it but figured I could get it removed and the inside was pretty clean from what I could tell.  Now since i have been lurking on the forum for a while I was first hoping to change just the cosmetic things on it but soon realized that I should really look into the engine.

Now I am not gonna lie, the aspect of an engine tear down seems quite daunting.  There are so many parts and patience required! Iím hoping I will be able to handle with the help from all of you good people on here.  Now the PO said the carbs were done just before he put it away (I know, everybody says something like that), but the outside of them are very clean and the engine did sound like it was running pretty good considering it had sat for a couple months.  The PO rode it up until May i believe then did not insure as he needed his truck for work. 

Now this project is going to be worked on when I am not at school or working and when the girlfriend feels willing to help me out in the garage despite the cold!  She is the one who will keep me from chucking wrenches and the engine out into the snow.

I have already started the build/tear down and havenít taken as many pictures as I have hoped for but here are some pics of what I have so far and will be posting more as school is winding down for the semester.

Offline ShaggyPit

  • Posts: 104
Re: CB750K - First Build
« Reply #1 on: Dec 02, 2014, 01:01:38 »
The Windjammer had to go first!

also the highway bars were stuck pretty good and after a few days of soaking them in penetrating oil, and hammering at them with a mallet, cut through the middle of them to get them off.


Tank was in good shape rather than a few dents but have stripped it down already and will post a pic of it once I have a chance.

Offline ShaggyPit

  • Posts: 104
Re: CB750K - First Build
« Reply #2 on: Dec 02, 2014, 01:04:02 »
ended up taking the headlight out of the windjammer and picked up a brand new bucket off CL recently and fitting is so close to perfect but I have no way to secure the headlight in the bucket as there are no mounts...any suggestions? I can post more pics if needed of this dilemma

Offline ShaggyPit

  • Posts: 104
Re: CB750K - First Build
« Reply #3 on: Dec 02, 2014, 01:06:46 »
As i mentioned in my first post, I am in university so money is gonna be pretty tight on this build

also being my first build I dont have any fancy tools, jacks, and lifts that some of you guys have.
Parents recently did a reno in the house and ended up having some spare 2 x 4's laying around so ended up building an engine mount and a saw horse which is doubling as a my tank holder at the moment  ;D 8)

they are pretty ghetto but are proving sturdy and handy so far!

Offline nrcb125

  • Posts: 280
Re: CB750K - First Build
« Reply #4 on: Dec 03, 2014, 04:03:57 »
ended up taking the headlight out of the windjammer and picked up a brand new bucket off CL recently and fitting is so close to perfect but I have no way to secure the headlight in the bucket as there are no mounts...any suggestions? I can post more pics if needed of this dilemma

Yep. I ran into the same problem with my CB125S.

Grab a 7" H4 reflector (I think it's a 7" for the CB750s... grab a measuring tape and check!) and use some silicon caulk to attach it to the trim ring. Make sure to clean everything really well and have it perfectly lined up before using the caulk and it should work nicely.

H4 bulbs will be a lot easier to find in a pinch than a sealed beam.

Here's a link to a 7" reflector with a short writeup of the things you need to consider when putting an H4 into an older bike:
http://4into1.com/candlepower-7-quartz-halogen-motorcycle-headlight/
« Last Edit: Dec 03, 2014, 15:49:58 by nrcb125 »
'73 CB125S - current project
'99 EX500 - Race Bike


CB125S build thread (haven't updated in 5ever): http://www.dotheton.com/forum/index.php?topic=43403

Offline ShaggyPit

  • Posts: 104
Re: CB750K - First Build
« Reply #5 on: Dec 03, 2014, 14:59:19 »
Ah ya thats what I was thinking.. some sort of caulking.

glad to see someone has some experience with it!

Ill give it a shot and hopefully it will work out!
Thanks for the link as well!

Offline ShaggyPit

  • Posts: 104
Re: CB750K - First Build
« Reply #6 on: Dec 03, 2014, 18:23:38 »
Here is some pictures of the rest of the bike and how it sits at the moment

the seat is in pretty good shape but the passenger spot is all torn up in some weird grid pattern  ???

but will probably be changing the style of the seat to get that flat look to it...probably gonna make my own.. never done it so should be interesting  ;D

got the frame out of the engine a couple weeks ago as well havent touched it since then however

frame is in the process of slowly being degreased then I will be taking it to a local sand blaster to have it cleaned up fully and then i will be repainting and coating it

will also be keeping stock rims but will have to polish them up and make it look somewhat new again

also here are some pics of the tank after i stripped it and a look at its dent as well...anybody got sure fire ways to remove the dent? ive tried a few off youtube with no luck so far



Offline ShaggyPit

  • Posts: 104
Re: CB750K - First Build
« Reply #7 on: Dec 08, 2014, 15:26:55 »
So i recently lined the trim of the headlight bucket with some silicon caulking

I think it turned out pretty well as everything is still very clean and there is no excess amount of the stuff on outside or inside
also im still able to remove the trim from the bucket with a little bit of care to make sure not to apply unnecessary pressure to the headlight

Im sure there are better ways of doing this, like getting the correct bucket but for now this seems it will hold great! so i am happy with it ;D

next up will be to remove the stock seat bracket and bend my own rear loop as well as fabricate a seat pan.

would electrical conduit work fine for the rear loop or should i use some sort of other tubing?

Offline SaltCityCafe

  • Posts: 388
Re: CB750K - First Build
« Reply #8 on: Dec 08, 2014, 21:08:59 »
You want to use something much stronger than conduit, and you want to use frame plugs. The frame is what holds everything together and keeps your ass off the pavement so not really a place to skimp. I also would advise against bending the loop yourself. Most of the good steel tubing you will use is going to be fairly thick walled and extremely hard to bend and not kink without a mandrel bender.

Long story short there are a few guys on here who sell seat loops at really reasonable prices and they do good work with the right bender and tubing.

If you still want to do it yourself however do a lot of research on the right tubing and methods of doing it

Offline ShaggyPit

  • Posts: 104
Re: CB750K - First Build
« Reply #9 on: Dec 08, 2014, 21:45:12 »
You want to use something much stronger than conduit, and you want to use frame plugs. The frame is what holds everything together and keeps your ass off the pavement so not really a place to skimp. I also would advise against bending the loop yourself. Most of the good steel tubing you will use is going to be fairly thick walled and extremely hard to bend and not kink without a mandrel bender.

Long story short there are a few guys on here who sell seat loops at really reasonable prices and they do good work with the right bender and tubing.

If you still want to do it yourself however do a lot of research on the right tubing and methods of doing it

ahh okay thanks for the info!