My 78 CB750F3 Super Sport Project

[shinyribs]

I have a good pair of front rotors. I'm not positive,but I'm pretty sure they'll fit your bike. They came off an '81C with Comstars. So they should fit your wheels,but I dont know if the overall diameter is the same. If you decide you need them I'd sell 'em cheap. How's $30+shipping for the pair sound? If you're interested I'll get some measurements.  I have a rear disc off a Comstar,too. From a 78K it should fit no problem. I'll take $15 for it,too. Just holler at me if you want any measurements. Later!

[Hoko]

These things are hard to measure when they're on the bike but it looks like my front ones are 11 inches OD and the rear one is 11 1/2 inches OD.

[Piute]

  I use cardboard for that type of mesuring tear off to get around (center axcle / caliper)
 mark then mesure,So simple ,to easy to think of.

[shinyribs]

I'll measure mine and holler back at.

[Hoko]

Piute wrote

I use cardboard for that type of mesuring tear off to get around (center axcle / caliper)
 mark then mesure,So simple ,to easy to think of.

Good idea, thanks Piute

[shinyribs]

I never made it in to the barn today.Sorry,but it's high on the list.

[shinyribs]

Hoko, my rear rotor is 11 5/8" with a 5 hole mounting pattern on about a 4 5/8" bolt circle. Fronts are 10 7/8" with a 5 bolt mounting pattern on a 3 1/8" bolt circle. Sorry for being so slow :(

[Hoko]

I measured my rotors with a piece of string this time (they are still on the bike) and got a little more accurate measurement.  
Front Rotor - Five mounting bolts.  10 7/8" OD
Back Rotor - Six mounting bolts, 11 1/8" OD
So the front ones look the same but the back is way different.

[Piute]

      Ya get all thoughs holes drilled yet
                                       gotta picture buddieee
         bored waiting on

[shinyribs]

The 5 bolt mounting rear rotor may have been off an old Comstar wheel that I'm not sure was for a 750. It had a funky cush drive. I didn't think of that til now so thats probably what the difference is.

[Hoko]

How much you want for those 2 10 7/8" rotors?  Oh I see, $30 + shipping.  How much is shipping?

[shinyribs]

Hey Batman,they should just fine in a large flat rate box. Those boxes are running $17 now.

[Hoko]

Polishing the needle valve seat, using an old rubber tipped needle in my drill with chrome polish, worked good.



Needle valve seat before polishing.



Also used qtip to polish some of the crud out, then put a small cloth on the end which worked well for cleaning up and buffing.



Valve seat after cleaning and buffing.



Also cleaned up mating surfaces with steel wool to help gasket seal better.

[Piute]

                         
                                                  one down 3 to go

[Butcherblock]

Wow Hoko! Those needle seats look awesome! Back to shiny brass. Looks like I had better do that to mine!

[Hoko]

Nah, they're all done.  Knocked them all out at once.  All those methods were little tips from different people.  It pays to hang out on this forum.

[Hoko]

Thx BB, yeah I've never done that before.  Just picked up tips from different people and they worked pretty well.

[Hoko]

I've had some time lately to work on my carburetors some more.




I took out my stock #35 pilot jets and replaced them with #42's for cooler idling.  If I decide to open up my exhaust for more sound, I'll change the #110 mains out for #120's.




I don't know if anyone else has this problem but there are gaps between my choke shafts and the carburetor bodies that are pulling unfiltered air into the cylinder so I put some orings on the choke shafts next to each hole where the choke shaft goes through the carburetor to stop the leaks.




Installed a new accelerator pump.




Finally got all new parts installed, float levels set, float valves polished, new float needles, carbs put back together and bench sync'ed.




Got everything ready to do clear tube test, just have to figure out a way to make a temporary gas tank.




PO said it wasn't charging when he last parked it.  Field and Stator coils checked out ok so this looks like it may be a weak link in the chain.




Lot of corrosion.  Is there a way to seal these connector blocks to keep moisture out?




Cut old female connectors off and installed new ones, installing in connector block.




New male and female connectors installed in each half block.




Finished connector block




These other 2 6 wire blocks don't look so great either, think I'll replace them too.  Is there a way to keep moisture out of wire connector blocks?

[TOOLS1]

You can seal the connectors with Dielectric Grease.
TOOLS

[Hoko]

Dumped the dirty old brake fluid out of the rear mc and filled it with new fluid.  Bled until it ran clear.  Pedal is good now.




Cleaned the nasty stuff out of the front mc and put new fluid in.  Not getting any pressure out of it.  Going to install a rebuild kit.



Wondered why headlight wouldn't hold adjustment.  Mounting bolt on curb side is too small and bushing on other side is missing.  If these aren't available I'll have a local machine shop make them.  Also 2 out of 3 of the smaller headlight mounting screw bushings are also missing.



Going to have some new faceplates made up to replace these sun warped ones.  Guy who makes them for me puts whatever image I send him on the faceplate.




Pulled all the chrome off and sending it in to Custom Plating in Houston to be rechromed.  Replacing the exhaust system later.