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  1. #1
    CB750 New Member Quadbuilt's Avatar
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    Jan 2021
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    South Coast NSW Australia
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    New Member from south coast NSW Australia CBX750F 1984

    Hi everyone,
    I just purchased this CBX750F 1984 model here in Australia; compliance plate/frame number (RC17-2005966) 3/1984.
    I have a few questions for those experienced CBX750/CB750 DOHC owners. The guy I bought this bike from said it was running 10 years ago had a recent top end rebuild then but had some electrical problems hence he stopped riding it. It also had a small gasket leak and the engine had a rattling noise when not under load that went away under acceleration. I assume the rattle is either a cam chain tensioner issue or the cam chain has stretched and needs replacing. So I have ordered a new one and full gasket kit but I want to sort the electrical issue out before I tear the engine down (this will be my first road bike tear down) I have experience with dirt bike engine rebuilds.
    Electrical Issues
    I intend to drain the tank and refurbish the caby's. Buy a new lithium battery spark plugs and begin tracking down the electrical issues.
    Any common failure points to look out for?
    Exhaust System
    I also noticed most images and videos of this model have a 4 into 2 exhaust system. This bike has a 4 into 1 (is that an after market system and muffler) or was there a choice when purchasing for or were there variations in different country's build years etc??

    Any help in getting me started in the right direction would be very helpful. I am keen to get cracking on this custom build.

    Cheers,

    J
    Attached Thumbnails Attached Thumbnails IMG_8746.jpg  

  2. #2
    CB750 Guru amc49's Avatar
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    Sep 2015
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    Fort Worth TX.
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    Not going to find much on this site on them, I don't think I saw 5 of those since 1984. The exhaust came only 4/2 and that exhaust exit says custom for sure. I myself would never buy a bike that somebody has been through the 'top end' on, it bespeaks too many things wrong. Cam chains make more noise at speed than they do down low at least in my view.

  3. #3
    CB750 New Member Quadbuilt's Avatar
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    Jan 2021
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    Quote Originally Posted by amc49 View Post
    Not going to find much on this site on them, I don't think I saw 5 of those since 1984. The exhaust came only 4/2 and that exhaust exit says custom for sure. I myself would never buy a bike that somebody has been through the 'top end' on, it bespeaks too many things wrong. Cam chains make more noise at speed than they do down low at least in my view.
    Well it has over 46000 Kms and the work was done by a qualified Honda motorcycle shop so I have no problem with professional top end rebuilds. Thanks for your input.

  4. #4
    CB750 Member fg1972's Avatar
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    May 2019
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    Australia
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    New Member from south coast NSW Australia CBX750F 1984

    Hi there and welcome.
    In regards to electrical issues, on the dohc cb750s, the charging system seems to be a common problem. The rotors can fail to produce AC volts particularly when hot and also regulator/rectifier failure where it wonít charge the battery.


    Sent from my iPhone using Tapatalk

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