Topic: CB750K0 restoration project

[Garystratos201]

Great job.......I`m struggling trying to clean my parts. A lot of wet sanding and patience.        Gary

[dangerdan408]

Got a little done today, parts keep trickling in...Got my repro 69-71 handlebars, petcock, the two odd sidecover grommets and tank mount rubber in from Vintagecb750.com, overall very happy with them, got the controls on them, but lost two of the case screws for the right side.

Got part of my order of rear spokes in off eBay, dude forgot to put 2 sets of 10 spokes in the bag, so I still can't assemble even one wheel yet. I let him know I was missing a bag, and they're supposedly in the mail now.

The pipes were purportedly shipped today, should be here middle-late next week, hopefully they'll survive the trip pretty much unscathed.

Got my turn signals, handlebar bolts and turn signal stems in from z1parts.net (they're carrying more Honda stuff now!)...and it's good and cheap.

Where do the two bigger of the six sidecover grommets go? On the oil tank?








Had the rear turn signal brackets powdercoated too.


Only half of the spokes




Now I got to looking, was this painted silver? Or is it something else?

[vnz00]

Now I got to looking, was this painted silver? Or is it something else?




Dan, yes it was painted silver (dull aluminum) - the best way to colour match it is to look at the colour in that recessed area under the caliper. The machined surface is painted too, but over time, the caliper will rub it off.

The arm is painted, the bracket however is not.  It is just cast aluminum finish as it is in the photo.

Just make sure there is no free play in the pin - once it gets sloppy, the caliper body will drag on the shoulder of the disc carrier and wear off the black paint.... if you are after a cheap alternative here, have the bracket/arm resleeved to suit the current size of the pin.  Hopefully tho, its not too worn.

[/quote]

[dangerdan408]

Thanks vnz00 for clearing that up and the word of precaution, I will take heed and look it over very carefully.

[dangerdan408]

Pretty productive night,

-Rebuilt the master cylinder, it's been cleaned thouroughly, new piston, etc.

-Cleaned the entire wiring harness with windex and a toothbrush (not the one I use twice daily).  Cleaned terminals out with q-tip and brake cleaner.

-Replaced fuse box in the harness with NOS.

-Rounded up all the parts that were non refurbish able and will be finding replacements.
-Got headlight mounted up and cleaned in NOS headlight ring

-Was able to keep original foot pegs after a cleanup. Before on the left, after on the right.

-Polished and reconditioned the original lines.


-Need to get the front piston out...suggestions?


Pretty much ready to reassemble when my spokes and hardware gets back from California.  Haven't heard anything from Marbles Motors, but they should be starting or done with pulling dents about now.  I think I'm beginning to see light at the end of the tunnel.

And got word that I will be getting the NOS tank from the original owner sometime soon, will post pics of that for sure.

[Prospect]

Great progress!  The piston can be taken out by attaching a grease gun to one of the fittings on the caliper and building up pressure.  You'll have to plug the other fitting. Make sure to do it over an area that can catch the piston cause it will fly out and could hurt somebody.  The other option and the one I use is to heat the entire caliper with a blow torch and the piston will come out as well.  I only do it because I don't have a grease gun.  It will take about 10 minutes of direct heat on the outside of the caliper.  Both fittings have to be plugged closed. It will burn off the rubber seal that is in there but it has to be replaced anyway.  Paint will be destroyed too. 

[jerry h]

Thanks for the pics - enjoying watching your restoration.
Boy, I haven't checked in for a day or so, really making some progress.

[dangerdan408]

Thanks for the pics - enjoying watching your restoration.
Boy, I haven't checked in for a day or so, really making some progress.

Thanks for the kind words, I'm really trying to get this thing running and riding for barbers next month, funny thing is I'm running a 5k this Monday at barbers...dont know how that's going to work out.  I'll post some more pics as the rebuild parts roll in. 

[dangerdan408]

Ran into some problems...apparently some nice guy swapped out 10 of the inner spokes for the front for some that were slightly longer at some point these were sitting on the shelf, yay...so now I have to buy ten more of the correct spoke before I can relace the wheel...it's been one of those days.



Just for fun!


Done? Nope, gotta do it all over again.


Thumb on the loose spokes, threads start about parallel to the rim

[dangerdan408]

Derp, installer error, got it all tightened up and it looks sweet, still waiting on spokes for the rear, put the showa shock decals on, stil have lots of cleaning to do...

[dangerdan408]

Refinished brake caliper bracket, was going to do more but got cut pretty good trying to remove the cotter pin from this.



Since I couldn't really work on anything else I came in and ordered what is hopefully the last of what I need to get the bike presentable, still need those two bolts for the brake splitter though, and those lock tabs for the rear sprocket and front brake, Honda lists them as obsolete, so aftermarket it is.  Excuse my handwriting, I was in a hurry and my hand is gimp right now.



More tommorow!

[Stev-o]

Man on a mission!

[dangerdan408]

Cleaned the carbs real well on the outside and insides, still have to kit them and super clean all the passages.  Let them sit overnight in some gasoline, then worked over with a toothbrush to preserve the original coatings.

New o-rings

[dangerdan408]

Well today is that day, it's been an adventure, got to run a 5k at Barbers Motorsports Park, on the track!  Anywho, feeling good, came home and that email I've been waiting on was there," Found the NOS gas tank, you can come pick it up."

Needless to say its now with me, here are some pics of it right out of the box.





Only imperfection, has a run in the clear from the factory.

[Tews19]

Serious where are you located? You have a great hook up. If you do not mind, what that set you back?

[dangerdan408]

Serious where are you located? You have a great hook up. If you do not mind, what that set you back?

I'm in Huntsville, AL...it was promised to me when I bought the bike for $400, so I guess you can say it cost me nothing except gas to go get it.  I do have pretty good luck in general.

[SOHC4 Cafe Racer Fan]

Wow!!  Amazing and fortunate!

[dangerdan408]

Thank you all for the kind words, really spurs me toward finishing this one and starting another, I found a really rough K0 at the local scrapper, 1/70 build, 19xxx / 20xxx frame and engine or the other way aroun...I'm going to try and pick up to build after this one if I can get the right price on it.  Maybe 836 or bigger, turbo, who knows what I'll end up doing with it.

But, today I got the rest of my missing eBay spokes in, built the wheel real quick and took them to my guy to get trued, he did them on my other bikes and he is awesome at it, should be back by the end of the week.  Picked up a new steering stem nut and washer while I was there.  Pipes should be in this week as well as the large order from powersportsplus.com with random stuff to freshen up the front end.

Rear done-


Dropped off to be trued-


New steering stem nut and washer-

[Fasted]

Awesome resto!!!  It is bringing back memories of my Sandcast resto of a few years ago.  If you contact Joe Marks at jtmarks@hvc.rr.com he can get you almost any Honda part made.  I got my HM300's from him for my project and at the time he still had 3 or 4 pairs left.  He has an enormous stockpile of Honda parts both used and NOS and has been very helpful.  He sells a lot on eBay but is more than willing to sell directly.  You can let him know that I gave you his name if you want.

Ed Decker

[guitarkev66]

That definitely trumps my blue NOS tank!!!!!

[dangerdan408]

Awesome resto!!!  It is bringing back memories of my Sandcast resto of a few years ago.  If you contact Joe Marks at jtmarks@hvc.rr.com he can get you almost any Honda part made.  I got my HM300's from him for my project and at the time he still had 3 or 4 pairs left.  He has an enormous stockpile of Honda parts both used and NOS and has been very helpful.  He sells a lot on eBay but is more than willing to sell directly.  You can let him know that I gave you his name if you want.

Ed Decker

Thanks for the source, there's a couple more parts I'm looking for that my sources don't.  I really want some new lock tabs for the disk brake rotor bolts up front.  I'm sure lots more will pop up as I go along.  Wish I had a sandcast!

[dangerdan408]

That definitely trumps my blue NOS tank!!!!!

I wish this one was blue, don't get me wrong, the red is nice, but I was REALLY close to getting the bodywork sprayed in blue instead of red...dangerously close.  That tank you have is amazing, just beautiful.

[Tews19]

How much is the trueing costing you? I've been searching for a tool to remove the spokes but the bike shops here I visited do not have the proper size. Where did you get your spoke wrench?

[dangerdan408]

How much is the trueing costing you? I've been searching for a tool to remove the spokes but the bike shops here I visited do not have the proper size. Where did you get your spoke wrench?

Its gonna hit me for about $45 a wheel, they said $60 an end for mount and balance a tire, but I can do that.  I used bolt cutters to remove my old ones, took about 30 seconds, but I had new spokes to replace the old ones...I have a spoke wrench from odd toolkits ive picked up from old Honda's, Kawasaki's, Yamaha's and Suzuki's.  I'll look and see if my guy has some spare ones for you.  I'll be back out there by Friday or Saturday to get my wheels.

[CycleRanger]

Rear done-

You could replace those cush rubbers with the "improved" versions and no one would be the wiser.
Although there's still a few new ones of the original design like yours floating around. I got two the last time I ordered a new set from Honda and had to exchange them for the newer style.