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Thread: 1983 GS750E Rebuild

  1. #1
    Join Date
    Dec 2017
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    Redmond, Washington
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    Default 1983 GS750E Rebuild

    Hello all! Posting from the beautiful (and cold) Pacific North West. I recently picked up a '83 GS750E and have begun the slow process of rebuilding. This will be a new challenge, as I've only half rebuilt one bike before, a 1981 Yamaha XS400.



    Here it is just after I picked it up. Definitely not the stock set up. The guy that originally owned it did a lot of custom work on it. Unfortunately, it has been sitting since 1990 or so, when the guy died. His son sold it in a lot of bikes to an exporter, who sold it to me for $350. Definitely gonna need some work. Here's the kicker though. Those carbs on it? Definitely not original. Definitely Mikuni VM29s, which are apparently worth some money. So I have rebuilt those and plan to sell them, hopefully help fund the rebuild.



    Here's the carbs after a full rebuild. Soon to be posted on eBay, had to wait till I got back from visiting the folks over Christmas.



    Bike as it sits now. Going to start tearing down the rest of it very soon. It's pretty cold for me outside (California native) but I'll have to suck it up, hah.

    Will be rebuilding some original stock carbs when they come in. Ordered a set off Canadian eBay that should be here soon.

    Cheers,
    Patrick
    Attached Images Attached Images
    1981 Yamaha XS400H
    1983 Suzuki GS750E (WIP)

  2. #2
    Join Date
    Feb 2004
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    I wonder if any internal performance mods were done to the motor. Smoothbores, braced or aftermarket swingarm, aftermarket exhaust as well home brew rearsets and lower clipons I would think there must be some fancy stuff hiding inside the engine. Welcome to the nut house and good luck with the project. Any history on it?
    '84 GS750EF (Oct 2015 BOM) '79 GS1000N (June 2007 BOM) My Flickr site http://www.flickr.com/photos/soates50/

  3. #3
    Join Date
    Dec 2017
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    Hey, thanks Sandy. I appreciate the welcome.

    Not much history I could glean from the exporter I bought it from. He basically just wanted to get rid of it since it wasn't a classic enough bike for him to export to Europe, apparently. As I said, the guy who originally owned it and did all the work on it died this past year, and it was sold by his son to the exporter. Really wish I could know, all the work on it really seems like it was done by someone who knew their stuff. He made custom sleeves out of aluminum to put the VM29s on there. I'm sure I'll be finding surprises through out the build.

    I actually got the new (well, to me) carbs in today. I just tore them down to soak in chem dip, and boy, I'm amazed at how good condition they are yet how bad condition they are. What I get for $35 on eBay. First carb came apart fine, although there was powder (rust and other corrosion from leftover gas I assume) everywhere in it. Same with the others. Second carb the pilot jet decided to not budge and the brass came apart like butter. Did my best to extract it, but to no avail. It's stuck and it wont be worth getting out at this point. Third and fourth were fine except for the fact that the float posts were broken. Third not so bad, fourth absolutely gone off, though someone tried to repair them (not the best work it seems).




    First one coming apart. That pile of rust/powder came out of the bowl. Nothing seems to damaged or in bad condition however.



    Third one's broken post. Still usable actually.



    Fourth one. I'm afraid the previous owners repair did not hold up.

    Good news is I've managed to track down some extra carb bodies on eBay and will hopefully be able to get them altogether next week. Time will tell.

    Cheers,
    Patrick
    1981 Yamaha XS400H
    1983 Suzuki GS750E (WIP)

  4. #4
    Join Date
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    St. Catharines, On.
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    Welcome to the site, Patrick.
    The classified section on this site is very active, just another place to check before hitting e-Bay.
    Hopefully you recorded the size of the jets in the 29s.
    Once you find out what is in the engine it might be helpful for someone else to know the numbers.
    2@ \'78 GS1000

  5. #5
    Join Date
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    Oshkosh, Wi.
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    Carbs smaller than stock, i'd bet big money, that engine is stock inside. Those 29's would work great on a stock engine.
    Dee Durant '83 750es (Overly molested...) '88 gl1500 (Yep, a wing...)

  6. #6
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    Nessism is offline Forum LongTimer GSResource Superstar
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    Those VM29's hold some value for sure. Check "sold auction" prices on ebay to judge. Pretty sure they flow a more air than the stock BS32 CV carbs that came on the bike stock. In terms of those other carbs, what a disappointment. Even if they were cheap I'd go back on the seller for the carnage. Some people sell pure junk on ebay hoping not get caught.

  7. #7
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    Why not just restor it to how it was modified way back when? It'd be a period correct "restomod"
    I build Pipers


  8. #8
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    I have one of these 750s and am a bit stalled in getting going again. I rotated the engine with the cam chain tensioner off the bike and jumped a couple of teeth on the timing chain. Mean while I've acquired a couple of more bikes that run and need room. Welcome from another Cali Native!

    83 GS1100g
    2006 Triumph Sprint ST 1050

    Ohhhh!........Torque sweet Temptress.........always whispering.... a murmuring Siren

  9. #9
    Join Date
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    Nice bike. I thought those were the wrong carbs on that bike. I definitely like the look of the bike.


    Ed
    GS750TZ V&H/4-1, Progressive Shocks, Rebuilt MC/braided line, Tarozzi Stabilizer[Seq#2312]
    GS750TZ Parts Bike [Seq#6036]
    GSX-R750Y (Sold)

    The fact that you infer my non-acceptance is what I'm talking about. (31Jan2021)
    Quote Originally Posted by GSXR7ED
    Forums are pretty much unrecognizable conversations; simply because it's a smorgasbord of feedback...from people we don't know. It's not too difficult to ignore the things that need to be bypassed.

  10. #10
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    I may be interested in the carbs depending on the price, though I would have much preferred to rebuild them myself, and would still probably tear them completely back down unless you have experience rebuilding smoothbores. Those jet blocks are fragile, and jet blocks gaskets as well. VM29 smoothbore jet block gaskets are also pretty rare at times, and don't fare well when ultrasonic cleaning or chem dipping the carbs with the jet blocks still installed, removing them is a must for full submersion cleaning, at which point they may get ruined just from removal and regardless you are best off replacing with new (or NOS) anyway.

    Before you throw them up on ebay, let me know what you would like to get without having to pay ebay listing fees and commissions and paypal fees

    Thanks,

    Chuck

    '77 GS750
    920cc, 4-1, GS1100E swinger, 18"rims, Fox Factory Shox, twinpot dual disc, VM29's, Yoshi cams
    '99 Kawasaki KDX220 rugged terrain ripper
    '74 Rickman VR250MX
    PROJECTS:
    '77 Suzuki PE250 Pure Enduro trail beast, ported, Wiseco, TüBliss, Fox Factory Shox/RaceTech
    '76 Rickman CR GS1000-1120cc roadracer, Yoshi cams&4-1, RF900R fork, Works ProRacers
    '79 GS425 489cc, GR650 cams, GS650 fork, twinpot discs, DID rims, GS1100E swinger, Fox Factory Shox
    '77 GS550 650-740cc susp/brake mods

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