Resurrecting a 79 CB750F SS

Discussion in 'Some Assembly Required' started by everready, Nov 3, 2017.

  1. everready

    everready Stuck in Ohio....Ugh!!!

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    So my awesome uncle gave this to me. His son, my cousin, had it for a while. The plate tags on it now are from 2010. I got a set of keys made for it and hooked up one of my other bikes to it. The motor turned over but didn't start. I've ordered a battery for it. Here are some pictures.

    This is what it looked like when I got it

    IMG_20171028_172930489[2].jpg IMG_20171028_172955129[1].jpg


    This is what came out of the gas tank.
    IMG_20171102_162725957_HDR[1].jpg



    And the inside of the tank.
    IMG_20171102_162744356[1].jpg



    I have vinegar in the tank now. I'm going to give a shake and stir it up and let it sit on different sides for a few days and see how much gunk comes out.

    Al
    #1
  2. VX Rider

    VX Rider Long timer

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    Change the oil, and clean the carburetors while you wait on that rust.
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  3. Fast Idle

    Fast Idle Since the Sixties

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    Can't see the pictures for some reason.
    Like to see the bike, use to have one and loved it. Silver or black?
    #3
  4. everready

    everready Stuck in Ohio....Ugh!!!

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    I'm not sure why the pictures aren't showing up for you. I'll try to post some after I get home today. It's the black one. I've followed a few of your builds and I'm really impressed. If you have any advice, I'm all ears. (this is my first build)

    Al
    #4
  5. Fast Idle

    Fast Idle Since the Sixties

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    Cool, I had the black one as well. Wish I still did. Bought it new back in 1979, first year for the DOHC 750.
    I think VX Rider has some good advice. Good luck!
    #5
  6. scot_douglas

    scot_douglas Dirt Harley Lovin'

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    They look to be attachments on CB750.com and you need to be a member to view.
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  7. everready

    everready Stuck in Ohio....Ugh!!!

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    Yea, I copied them from there. I didn't know that would cause a problem. I'll correct it when get home today.

    EDIT: Pics should be fixed now.
    #7
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  8. everready

    everready Stuck in Ohio....Ugh!!!

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    I pulled the shocks and left side exhaust today. Vinegar does a pretty good job on rust. I'm trying to figure out a way to clean the inside of the shock springs. Maybe I'll just paint them after cleaning them up best I can. IMG_20171104_101048865[1].jpg

    The left exhaust is pretty rough. I'd really like some suggestions on the best way to clean these up. I may end up painting them as well. The right side is pretty rough too, but not as bad as the left. I haven't removed the right side yet.

    IMG_20171104_101054004[1].jpg IMG_20171104_101100387[1].jpg
    #8
  9. everready

    everready Stuck in Ohio....Ugh!!!

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    The right side muffler has a big bulge in it. I may have to go with some slip-ons or a complete aftermarket system. The MAC one is priced at around $275.00.
    These slip-ons seem decent.
    https://www.ebay.com/itm/2FastMoto-...Motorcycle-Exhaust-Custom-Honda-/192030222719
    EDIT: I took a better look at my pipes. It seems I'd have to cut the mufflers off of the headers in order for slip-ons to work. Not sure what to do now.
    Any advice is welcome.
    IMG_20171104_105844790[1].jpg
    #9
  10. everready

    everready Stuck in Ohio....Ugh!!!

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    Took the front master cylinder off today. What a mess! My clip-ring pliers can't reach the E clip. I'm going to take the it into work tomorrow. IMG_20171105_140246063[1].jpg
    #10
  11. everready

    everready Stuck in Ohio....Ugh!!!

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    After some research I decided to just order a new master cylinder. It's $54.00 delivered from David Silvers' Spares. The rebuild kit for the old one would have cost around $80.00, not counting the time to prep/paint.
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  12. r60man

    r60man Long timer

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    For the gas tank, add some nuts and bolts to the vinegar. Give it some vigorous shaking. I have a buddy that took a rotisserie from a grill and he would attach the tank to that. Cleans up the insides really well.
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  13. everready

    everready Stuck in Ohio....Ugh!!!

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    The tank is coming along. Maybe a few more days.............
    The nuts and bolts certainly helped. It's quite a workout too.
    IMG_20171107_163711896[1].jpg
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  14. Fast Idle

    Fast Idle Since the Sixties

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    I'd wait on the exhaust for now until you're farther along on the build and sure the engine is up to snuff. You can run the exhaust you have to fire it up. I've always liked the sound of a 4 into 1 myself. Might I suggest you take a close look at those pod "air filters". There are lots of them out there that are just wire screens with no real filtration at all. The only pods I would run are the oiled foam ones that actually filter the air. If you can see light through them and there's nothing to oil in between the layers of wire mesh then I would get rid of them. Dirt and dust will kill an engine before it's time.
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  15. everready

    everready Stuck in Ohio....Ugh!!!

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    Thanks for your input. I've been reading up on this issue. It seems that this bikes run the best with the stock air box. So I'm going to find one after I check the engine out.

    These are kind of in stages:

    1. Get it running/do valves/change oil. It has only 8k on the odo.
    2. Make it safe. I'll need new cables/tires/rear shocks/fork oil and chain-sprockets, at a minimum.
    3. Clean it up best as I can. I'll probably have the headers sand blasted and paint them and cut the old mufflers off and put on some slip-ons.
    4. Ride if for a few years and maybe do a full restoration on it. There is a powder coating place a few miles from where I work. I just need to figure how much something like that costs.

    I already have a 13 Vstrom 650 and a 97 DR441. So I don't *need* the Honda to ride. It's just a project to help keep my busy this winter.
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  16. Fast Idle

    Fast Idle Since the Sixties

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    +1 on the stock air box
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  17. everready

    everready Stuck in Ohio....Ugh!!!

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    Well I think the gas tank is ready. It's not perfect but it's a lot cleaner than it was. I mixed some oil and gas and sloshed it around really well. I hope it coated all of the inside.
    A note: before putting in a bunch of bolts to scrub the rust out be sure the gas cap hole doesn't have an inner lip. I had a hell of a time getting those long bolts out as they're less likely to fall into that small hole. I ended up taping a strong magnet onto the end of a piece of coat hanger, bending it 180 like a hook and turning the gas tank upside down trying to get the bolts to stick to the magnet. It worked after a while but it took me about 1/2 an hour to get them out.
    #17
  18. r60man

    r60man Long timer

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    Looks like your priorities are in order. My buddy has a CB400F that sat on two flat tires for 20 years on touched. He insisted that the tires would still be good and because they were original he wanted to keep them. After much explaining how the bike is never going to be worth tons of cash he finally caved and is getting new rubber.
    #18
  19. kenny robert

    kenny robert Long timer

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    nice eff !!
    go with 520 chain, stock airbox torque head and cylinder bolts
    have you scoped the bores out ?if there is any rust its gotta come apart now or soon after you run it
    it is not a tractor dont fire it up at all with rusty bores thats my best advice
    if a bore is rusty so are some valve seats
    the last thing you want to do with an engine that has not run for long time .aka the first thing not to do, is turn it over, before a careful, thorough. inspection
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  20. kenny robert

    kenny robert Long timer

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    Freddie-Spencer-original-2.jpg
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