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  1. M

    1975 CB750 primary chains and tensioner question

    1975 CB750 basket case rebuild in progress (no idea how man miles on the engine, came with 2) (pic). Cracked the cases (first time doing so) and right away noticed the primary chain on the clutch side appears to have less tension than the inner chain (pic) - sounds like this may be normal after...
  2. M

    cylinder base gasket - gasket sealant?

    Dirtdigger, Happy New Year and Thanks!
  3. M

    cylinder base gasket - gasket sealant?

    Finishing the upper motor rebuild on my 73 cb750 and am a little nervous about the final steps failing (i.e. gasket leaks). I have a KP gasket set and was wondering if I should use any type of gasket sealant on the cylinder base gasket? The online company I bought it from advertised it does not...
  4. M

    1973 Cb750 exhaust ideas?

    Thanks, I spoke with someone there yesterday that couldn't give me much information, especially when it comes to diameter size of the inlet on the muffler. Waiting to see if they email me.
  5. M

    1973 Cb750 exhaust ideas?

    Thanks for the info. I emailed cyclex for more information.
  6. M

    1973 Cb750 exhaust ideas?

    Anyone have suggestions for a new quiet muffler so I can get rid of this dangerous and ugly aftermarket piece? The exhaust from the head is 4 into 1 and is about 2.5 inch in diameter at the junction. Thanks.
  7. M

    73 CB750 front brake issues

    Thanks, have new brake lines ordered. Hopefully that does the trick.
  8. M

    73 CB750 front brake issues

    Quick question. Is there anything I can use on the threads of the brake line at the caliper to stop a very small leak or do I have to buy a new caliper?
  9. M

    73 CB750 front brake issues

    Tried the other piston and caliper tonight, didn't work. I'll try a new piston in the caliper to see if that works. If it doesn't, I'll stick with the one caliper system. The MC is off a GL1000. Thanks!
  10. M

    73 CB750 front brake issues

    Thanks for the info. Sorry, didn't mention the brake configuration was changed to 2 discs at some point prior to purchase and I assume were working at some point as well. Both ports of the MC are open and functional (brake fluid can be expressed from the smaller port when pressure is applied...
  11. M

    73 CB750 front brake issues

    Thanks for the info. Still lost. Everything appears functional. Compensation port is open with fluid able to be expressed easily. Pistons in the brake caliper are spotless and able to slide past the seal prior to adding brake fluid. When I opened the bleeder valve last night I was able to...
  12. M

    73 CB750 front brake issues

    I just wanna ride!!! Still with front brake issues... I rebuilt the master cylinder and it appears to function with check valve working. I also rebuilt the brakes including new piston seals. The brake lines were not replaced but were cleaned out with wire and compressed air passes easily...
  13. M

    CB750 front fork seal direction?

    Replacing the front fork seals and can't figure out what side faces down into the fork. Both sides of the seal have compression springs and have flat surfaces. The OD also appears the same on both sides. One side does appear to have 2 ridges/lips internally and also has a larger external gap...
  14. M

    Front brake master cylinder piston replacement

    It popped out by applying further break pressure. Both pistons and calipers are nasty but look salvageable. Onward! Thanks.
  15. M

    Front brake master cylinder piston replacement

    It's working! However I am unable to remove one of the pistons. I'm too nervous to to push the brake too far. should I soak it in PB blaster in an attempt to free it up? Thanks.
  16. M

    Front brake master cylinder piston replacement

    Thank you! I'll try again tonight. If no luck I'll look for a new master cylinder.
  17. M

    Front brake master cylinder piston replacement

    Honed and cleaned the ID and reassembled. Seal is not leaking now but still very little and inconsistent fluid comes out the lines. Lines are clean and easily drain fluid when disassembled from master cylinder. Thoughts?
  18. M

    Front brake master cylinder piston replacement

    Grrrrr. Ok will take it apart again, hone the ID and make sure the inlet holes in the bowl are clean and functional. Thanks again.
  19. M

    Front brake master cylinder piston replacement

    Rebuilt the master cylinder. It doesn't seem to build pressure and a small amount of brake fluid leaks out around the dust cover at the brake lever (like it was probably doing before based on the crud noted on the brake lever - see pic above). Broke it down again last night to make sure seal and...
  20. M

    Front brake master cylinder piston replacement

    Photos of current piston and brake lever attached.
  21. M

    Front brake master cylinder piston replacement

    Rehabbing my newly acquired 1973 CB 750. Ordered a new front brake master cylinder rebuild kit for a 73 and the piston is too narrow. I believe the master cylinder on the bike is from a Goldwing based on the shape of the front of the brake lever? (the front brake was converted to 2 discs at some...
  22. M

    1974 CB 750 pricing help (new to forum)

    Here it is. $450 later. just finished rebuilding the carbs (before pic attached), there were no moving parts on the carbs.. Any ideas for a muffler? I'll start posting new threads from here out. Thanks!
  23. M

    New Member with a Project CB750A Automatic

    Springer, did you get the bike running?
  24. M

    1974 CB 750 pricing help (new to forum)

    Appreciate the help. Will let you guys know what happens in a couple weeks.
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