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  1. #1
    CB750 Enthusiast wingedwheel's Avatar
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    1978 CB750A, bringing it back..

    Picked up a 1978 750A that has been sitting for 25yrs. PO put it away in '91 and it sat there ever since. He passed away last spring and his widow decided to clean out his garages. I was a little skeptical because of the automatic handle but after talking to a buddy that ran a bike shop for years and was a Honda specialist he assured me that they were good machines and they just didn't sell because people had the same mixed feelings that I did when i looked at it. She knew absolutely nothing about the bike so I decided to pick it up because the price was right and the engine was free. I did a 750 build some years ago and loved that bike. it was pretty dirty but it was all there and in decent shape so why not?Click image for larger version. 

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ID:	7747 I started by removing the hideous bags and aftermarket fairing.Click image for larger version. 

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ID:	7749. Today I pulled the tank off and removed the spark plugs(quite the job after 25 yrs). I sprayed some oil into the cylinders to lube the rings up and I plan on trying to do a little everyday.
    Attached Thumbnails Attached Thumbnails tankoff1.JPG   frametop1.JPG   frametop2.JPG  

  2. #2
    Moderator dirtdigger's Avatar
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    They are just as reliable as the std bike just less power. They are dead consistent in drag racing, several of them out there.

  3. #3
    CB750 Enthusiast wingedwheel's Avatar
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    dirtdigger, funny you should say that. the woman I bought it from showed me this pic of her late hub and my buddy actually knew him and said he was going to turn it into a drag bike before an accident made him put it away where it sat for 25 yrs, this was a pic of her late hub she showed me.Click image for larger version. 

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  4. #4
    CB750 Enthusiast wingedwheel's Avatar
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    Finally getting motivated, pulled the seat and contacted my seat guy to see what he would charge me to get rid of the Saddleman style and take it to a bench seat. I was a little intimidated at first but realized it was mainly because I couldn't see anything on the bike so I sat down and started whittling away at the parts that needed to come off and began to solve the mystery of what the bike needed. The solenoid had the battery cable cut and when I hooked up a jump charger to it to see what it would do I immediately heard a "clicking" when I turned the key on.Click image for larger version. 

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ID:	7776Not sure what was going on but I'm pretty sure I have an electrical problem because I also found this.Click image for larger version. 

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ID:	7777 I also pulled the airboxes and carbs. They stunk pretty bad of old gas and varnish. The linkage is also froze up so that goes on the job list of things that absolutely have to be gone through totally.Click image for larger version. 

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ID:	7779. I also saw this button.Click image for larger version. 

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ID:	7778 Can anyone tell me if it's what I think it is? Was the Hondamatic the only model with a parking brake?

  5. #5
    Moderator dirtdigger's Avatar
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    Yes it is a park brake. Keeps the rear brake applied so if you park on a hill it wont role. Its an automatic so if you put it in gear it would still role because of the torque converter...no direct link to motor to keep it from rolling.

  6. #6
    CB750 Enthusiast wingedwheel's Avatar
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    Thanks dirtdigger. I noticed it goes to the brake unit mounted on the lower right side. I'm still learning the ends and outs about this bike and appreciate any information. My Clymer manual is not the easiest thing to understand and sometimes seems a little incomplete.

  7. #7
    Moderator dirtdigger's Avatar
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    Clymer and Haynes manuals are the worst ones on the market, many errors and inaccurate information. Get a factory Honda manual, well worth the money. You can find them online to download but I prefer factory paper manuals setting on my benches.

  8. #8
    Moderator dirtdigger's Avatar
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    Any questions dont be afraid to ask, I dont have much experience with the auto but the basic engine is the same as the std 750.

  9. #9
    CB750 Enthusiast wingedwheel's Avatar
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    Thanks dd, I've been searching for a factory manual online but most of the links I'm finding are the KO-F

  10. #10
    CB750 Enthusiast wingedwheel's Avatar
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    Used my TOR browser and found a complete factory manual to download. Couldn't get there with my regular browser but found it on the deep web. What a difference, it shows everything, even the correct way to route the wiring and cables. This should make things a lot easier!

  11. #11
    CB750 Enthusiast wingedwheel's Avatar
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    Found a set of cab kits for $50 from a seller on Ebay that I've used before. Ordered the kits from Japan, now if I could find a decent price on the accelerator pump diaphragm. That little dude is not cheap either. I found a pic of my 750 that I built back in the '80's. That engine was a '69 and bullet-proof.Click image for larger version. 

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  12. #12
    Moderator dirtdigger's Avatar
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    http://www.cb750supply.com/products/...t-bowl-gaskets look at the bottom of the page for the pump diaphram. They also have a giveaway and support the forum. Their parts seem to be of decent quality, have ordered from them in the past.

  13. #13
    CB750 Enthusiast wingedwheel's Avatar
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    Thanks dd, I'm ordering one tonight. I did a pretty thorough search(or so I thought) and didn't see these. Now my only issue will be getting that linkage freed up.

  14. #14
    CB750 Guru amc49's Avatar
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    Found manual right here................

    http://manuals.sohc4.net/cb750a/serv...ual/SM750A.pdf

    Just posted link for another guy, might as well here too.

  15. #15
    CB750 Enthusiast wingedwheel's Avatar
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    Thanks amc49 That's exactly the one I found. Nice to have an extra link.

  16. #16
    CB750 Guru amc49's Avatar
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    Accelerator pump diaphragm possibly here...............

    http://www.partsnmore.com/parts/honda/cb750f/?filters[category]=carb

    one of the call out numbers is the one for the automatic SOHC. Go to the carb section and row through the parts.............$20 plus shipping.

  17. #17
    CB750 Enthusiast wingedwheel's Avatar
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    amc49 I picked one up from CB750 supply for $10 plus shipping. It's already installed.

  18. #18
    CB750 Guru amc49's Avatar
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    That's a GREAT price...................

  19. #19
    CB750 Enthusiast wingedwheel's Avatar
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    Next issue, I'm trying to get the brake mechanism apart. Can anyone tell me if part #3 the rear brake joint is supposed to just pull off the shaft? If so mine is really stuck on there.Click image for larger version. 

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  20. #20
    CB750 Guru amc49's Avatar
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    Hard to tell what slips and what rachets there at some parts, looks like it just slips off the spline but if racheted up on the other half of it, it will not, the rachet has to be backed off in some way to let it come loose. If all rusted together it will be fits doing that, the rachet balls could be all seized up.

    You might try messing with the rachet lever to see if it loosens using that or unbolt the rachet base off the brake plate to see if the whole thing comes off. Or unhook any springs and lightly drive the brake axle spindle backwards out of the plate.

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