Salt City Cafe Build 1971 CB750 - Its Finally Done!

Re: Salt City Cafe Build 1970 CB750

danejurrous said:
Glad to see another Utah resident on the site.

Fork conversion info on all balls racing website might help ya with the fitment.

https://www.allballsracing.com/index.php/forkconversion
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Hey Danejurrous glad to see another Utahn as well.

I was just looking at the allballs site earlier. I need to find out the year of the R6 front end and then go from there. I am pretty sure I can make it work if I do a combo of the stock stem, some bottom triple and an aftermarket or custom machined top triple. Once I get more info on the R6 front end then I can figure out axles and wheel choices and what not. The bottom triple is the one that is really concerning me at the moment
 
Re: Salt City Cafe Build 1970 CB750

Ok so I found out that the R6 front end is an 04. After checking the all balls site they do have a bearing kit for it. So just to make sure I understand this right the bearing kit is to use the R6 steering stem and triples(aftermarket top) and the bearing kit makes it so that it fits into the CB750 frame no muss no fuss so to speak. I understand how it all goes together but the conversion portion of it is still new to me. I am thinking I will have to just use the R6 front wheel or do some searching to find something compatible just to avoid issues. Anymore help?
 
Re: Salt City Cafe Build 1970 CB750

SaltCityCafe said:
Ok so I found out that the R6 front end is an 04. After checking the all balls site they do have a bearing kit for it. So just to make sure I understand this right the bearing kit is to use the R6 steering stem and triples(aftermarket top) and the bearing kit makes it so that it fits into the CB750 frame no muss no fuss so to speak. I understand how it all goes together but the conversion portion of it is still new to me. I am thinking I will have to just use the R6 front wheel or do some searching to find something compatible just to avoid issues. Anymore help?
Click to expand...

The site just sets you up with the right bearings to fit between the two parts (frame and triple) the length of the stem may still need to be turned down because the neck may be thinner that that on the R6.

If you are looking for ease on fitment and such to use the front forks and brakes use the R6 wheel because you wont have to fab up spacers. As for the rear wheel if you want it to match you will need to find out if a R6 wheel will fit in the swinger or find another option for a swinger that would be a little wider. If either of those don't work you would be looking at a different front wheel and rear wheel then fabbing up some spacers for the axles and brake rotors.
 
Re: Salt City Cafe Build 1970 CB750

danejurrous said:
The site just sets you up with the right bearings to fit between the two parts (frame and triple) the length of the stem may still need to be turned down because the neck may be thinner that that on the R6.

If you are looking for ease on fitment and such to use the front forks and brakes use the R6 wheel because you wont have to fab up spacers. As for the rear wheel if you want it to match you will need to find out if a R6 wheel will fit in the swinger or find another option for a swinger that would be a little wider. If either of those don't work you would be looking at a different front wheel and rear wheel then fabbing up some spacers for the axles and brake rotors.
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Yeah I did find a thread on sohc4.net of someone using R6 components and his stem he said was just about the perfect length. That was from a 90 something donor bike though so the newer one might be different. I am thinking I will just pick it up and play around with it. I am sure once I get it all apart the changes that need to be made if any will become apparent.

As for the rear I would rather not have to change or build a new swing arm so I am sure I will be looking for some sort of different wheels. I like the spoke wheels I have now so I may look into finding a spoke front wheel that will clear everything on an R6 front end and then keeping the rear pretty much stock.
 
Re: Salt City Cafe Build 1970 CB750

Hey so I got a few hours today to get to my bike and do some work.

Just in the tear down phase now



The carbs need a major cleaning. I am hoping that no rebuild will be needed but we will see when I clean them.



The starts of building my seat. I didn't buy enough foam so only got a start on it.



Chopped off the rear so I can fab up a hoop



Starting to look like something now


Fabbed up a cart really quick and took off the front end



So I measured my steering stem and it measures 9" The R6 front end stem is 8.5" just a half inch difference so with a bearing kit from allballsracing.com I think it should pretty much bolt up. Is my thinking right on this?


That's all for now. Unfortunately I am quickly getting to the point where its going to start requiring the one thing I don't have.....money but as that comes so will parts and progress....Stay Tuned!!
 
Re: Salt City Cafe Build 1970 CB750

I'm not sure why this hadn't occurred to me before now but I just thought that I am going to have issues with a speedo using the 04 R6 front end.

Is my only option a digital speedo or can I still use a mechanical speedo. I would definitely prefer a mechanical one so I am curious what the general consensus is on this?
 
Re: Salt City Cafe Build 1970 CB750

Finally after all sorts of life getting in the way I picked up my R6 front end. It is a little more and less than I expected however. I thought it would have the steering stem still in the lower triple but it seems it has been pressed out so I will have to look into getting another one, if anyone knows of the best place to get one let me know. Also he couldn't find the axle so I will have to track one of those down. However I did get the fender and the clip-ons which I wasn't expecting. All in all I'm happy either way especially since it only cost me $40

 
Re: Salt City Cafe Build 1970 CB750

xb33bsa said:
why not use the one you have, cut it out, machine to fit
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Are you talking about the axle or the steering stem? In either case the CB750 is smaller than the R6 so I can't machine them to fit. Unless I am missing what you're talking about in which case I welcome the correction.

Oh and I have looked into it some and I can get both the axle and the stem w/ new lower triple for a total of $130 so not exactly breaking the bank considering what I paid for the forks and clip-ons.
 
Re: Salt City Cafe Build 1970 CB750

130 sounds reasonable for both if you dont have a lathe
but i was talking about the stem making it fit would be easy just some adapter bushes if it is too small
keep up the good work !
 
Re: Salt City Cafe Build 1970 CB750


there are a bunch of people who have attempted all sorts of front end conversions that you can prob find on this forum and over on the sohc4 forums. a common swap is the gsxr inverted fork front end (since parts are cheap and plentiful, and its a good bolt up).

you can also check out my thread at http://www.dotheton.com/forum/index.php?topic=45763.0 - which isn't exactly what you are doing, but i would think it's still relevant.

when bolting the fork the frame, the two main issues is the bearing compatibility (which is rather easy if you have the right ID and OD sizes to start), and the other issue is that the bottom bearing may be too recessed in the frame, and the frame will contact the lower triple. this is true for the GSXR conversion (to CB350). your particulars are different but you may want to measure that out. a spacer should make things right.

the real complexity lies w/ the front wheel. if you want to retain the spoked wheel look, then you have a lot of work ahead of you. if you're just going to repurpose a existing R6 mag wheel, then its a lot simpler. there are a lot of details regarding the spoked wheel on my thread.

good luck! looking forward to seeing what coms out of it.
 
Re: Salt City Cafe Build 1970 CB750

timmysf said:
there are a bunch of people who have attempted all sorts of front end conversions that you can prob find on this forum and over on the sohc4 forums. a common swap is the gsxr inverted fork front end (since parts are cheap and plentiful, and its a good bolt up).

you can also check out my thread at http://www.dotheton.com/forum/index.php?topic=45763.0 - which isn't exactly what you are doing, but i would think it's still relevant.

when bolting the fork the frame, the two main issues is the bearing compatibility (which is rather easy if you have the right ID and OD sizes to start), and the other issue is that the bottom bearing may be too recessed in the frame, and the frame will contact the lower triple. this is true for the GSXR conversion (to CB350). your particulars are different but you may want to measure that out. a spacer should make things right.

the real complexity lies w/ the front wheel. if you want to retain the spoked wheel look, then you have a lot of work ahead of you. if you're just going to repurpose a existing R6 mag wheel, then its a lot simpler. there are a lot of details regarding the spoked wheel on my thread.

good luck! looking forward to seeing what coms out of it.
Click to expand...

Thanks Timmy for the info. I already know the lengths and what not that I am looking at plus I have been basing what I have been doing on this http://www.dotheton.com/forum/index.php?topic=21648.0

So you can see from that thread the machining I am going to have to do and what not but I have a plan and have been researching the bejesus out of it to the point where I am driving the people around me nuts talking about it LOL
 
Re: Salt City Cafe Build 1970 CB750

So I finally got time to get down to my bike and put in some work today.

First I got the rear end all torn apart.



Yeah its filthy as hell. Not looking forward to the deep clean its going to need



Laid it on its side and got the motor out. Took some doing but wasn't to hard at all.





Despite how filthy the outside is I was pleasantly surprised to find out that the inside looks great so far. I am still going to pull the head off and check the pistons and cylinder walls and do the head gasket.


Test polished my wheel hub...looks like its going to be nice!


Did a little bit of work on the seat just starting to get ideas. Going to do a full write up when I do it.
 
Re: Salt City Cafe Build 1970 CB750

So its been a few since I updated but I have been in parts collecting mode so not really a whole lot to report.

I did however get down and do my first attempt at knee dents.

Layed out my design. Its a little different than most but I had a dent in the tank most likely from it getting tipped over so I had to incorporate it into my knee dents.


My weapon of choice.


Pounded them out and started stripping the paint off my tank.





For my first attempt I am pretty happy with how they turned out. I will finish getting it stripped down and then bondo it up and smooth it out then it will be paint time!




Big things coming over the next month or so :)
 
Re: Salt City Cafe Build 1970 CB750

Thanks I was surprised at how easy it really was to do. I might get more adventurous with it on future projects now.
 
Re: Salt City Cafe Build 1970 CB750

Got busy again today and made some good progress.

I finally got my steering stem here and test fitted the front end. I looks great and just waiting on the machinist at work to make all my parts to get it all together.








Got the tank all stripped and sanded down. I had a moment of inspiration and I think I am going to paint the tank but just clear the knee dents. I love the bare metal and the texture of the hammer marks so I wanna leave them.





Then I started working on my seat. Started the usual way




And turned it into this. Still needs some work but I am liking the shape. I am leaving it kinda big because I am not a small guy and I need it to look a little larger so it doesn't look funny being ridden.





She is a fat bottomed girl but hey they make the rockin world go round

 
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