GPZ-750/1100 everything thread!

Discussion in 'Old's Cool' started by Michelangelo, Nov 26, 2014.

  1. 1/2 Brit

    1/2 Brit Been here awhile

    Joined:
    May 15, 2011
    Oddometer:
    360
    Location:
    Southern Illinois
    I have a '83 KZ750 Sport, similar to the '82 GPZ 750, and the same problem.

    I'm going to replace the solenoid, put on braided steel brake-lines, a V&H header , re-jet the carbs for this winter's project. :wink:

    [​IMG]
    #21
  2. Michelangelo

    Michelangelo 2 wheel rider...anytime..

    Joined:
    May 23, 2005
    Oddometer:
    1,847
    Location:
    Rocky Mountain West
    I need some engine covers and airbox to carb boots.
    If you have any of these lying around or know where to get cheap, please let me know.
    #22
  3. Johann

    Johann commuterus tankslapperus

    Joined:
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    Europe
    One of the problems I had the GPz750R1 was the clutch cable. The pushrod mechanism under the sprocket cover would sometimes become loose or even disengage totally. Not the end of the world but a bit of a faff. The solution is to fit a clutch cover from a GT550 or 750 and have the cable route under the carbs to the r/h side of the engine. May not be an issue for you.
    #23
  4. Bigger Al

    Bigger Al Still a stupid tire guy

    Joined:
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    Oddometer:
    8,855
    Location:
    Auburn, CA
    My wife found this in a box of stuff:

    [​IMG]
    #24
  5. aaronric

    aaronric Adventurer

    Joined:
    Jul 9, 2014
    Oddometer:
    74
    Location:
    Charlottesville, Virginia
    Are there any after market exhaust options that work for the '82 GPz 750? Google would like me to believe that VH 4-1 systems work, but I've read more than enough reviews reporting fitment issues with those to be wary.

    There seem to be some Mac systems floating around, but those look pretty cheap ... And since Kerker is gone, the only option is shelling out $800 for an NOS system from eBay.

    Anybody know of anything bolt on?
    #25
  6. Michelangelo

    Michelangelo 2 wheel rider...anytime..

    Joined:
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    1,847
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    What about a MAC header with an aftermarket can attached? Should be pretty easy to do. That’s what I was thinking of doing. I have my NOS exhaust on my 84 that I would like to trade or sell for a 4-1.
    #26
  7. aaronric

    aaronric Adventurer

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    Charlottesville, Virginia
    That could work, but I'm still not sold on the Mac stuff ... It just doesn't look as nice as I'd like. The stock exhaust is gorgeous, but I would like to get a bit throatier sound. So if I'm going to replace the 4-2, I want the fit and finish to be close to the original.
    #27
  8. Johann

    Johann commuterus tankslapperus

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    Don't know if they are available Sstateside but Motad 4-1s work well with stock jetting.
    #28
  9. Bigger Al

    Bigger Al Still a stupid tire guy

    Joined:
    Oct 12, 2004
    Oddometer:
    8,855
    Location:
    Auburn, CA
    My bike had the stock system on it when I bought it. In the above pic it wears a Supertrapp 4-into-1 that I bought at a cycle salvage yard. I removed the airbox and installed individual Uni filters, and rejetted the carbs using a Dynojet Stage 3 setup. The bike made impressive top-end power with the Trapp, and still pulled nicely from down low. The biggest drawbacks were the noise, which was pretty loud, and the fact that Supertrapps have a reputation for blowing their guts out on the highway. I drilled and safety wired the bolts that held the baffle plates in and had no issues at all. Initially the muffler had a closed end cap on it, but I found later on that the open end cap made things smoother in the upper reaches of the tach.

    Another thing to consider is the stock petcock. It's a vacuum operated setup that cuts off fuel flow when the engine shuts down. I had hell's own time starting my bike on occasion until I removed that vacuum system from the petcock. Were I to do it all over again I'd likely buy either a Pingel unit ($$$) or try to find something from an off-road machine that would fit the bolt spacing of the GPZ's tank.
    #29
  10. schoals

    schoals Been here awhile

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    Location:
    Dahlonega GA
    IMG_20180410_184903.jpg
    #30
    Johann, racer1735 and DC950 like this.
  11. schoals

    schoals Been here awhile

    Joined:
    Dec 8, 2009
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    687
    Location:
    Dahlonega GA
    Anybody looking for GPZ? I have a stock 1100 and a stock 550 about to go up for sale

    The 1100

    IMG_20180613_152010688_HDR.jpg

    The 550

    IMG_20180514_192023190.jpg
    #31
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  12. aptbldr

    aptbldr easy rider

    Joined:
    Apr 20, 2009
    Oddometer:
    657
    Location:
    Upstate South Carolina, USA
    Owned an '84 GPz 750 as my only street bike for seventeen years. Rode it all over the southern Texas & eastern US.
    These are vintage, versatile, and excellent machines. Simple, reliable, and kinda heavy by modern standards.
    #32
  13. neil w

    neil w Been here awhile

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    163
    In the Uk Practical Sportsbike magazine did a series of articles over 9 or 10 months a few years ago where they rebuilt a GPZ750 aircooled with uprated running gear and brakes , well worth a read if you can view them online gpz750.jpg
    #33
    schoals likes this.
  14. aptbldr

    aptbldr easy rider

    Joined:
    Apr 20, 2009
    Oddometer:
    657
    Location:
    Upstate South Carolina, USA
    My GPz begged for improved suspension. All it got was new springs.
    Brakes were OK with SBS pads, steel lines and blocked off anti-dive valve.
    #34
  15. jethrocephus

    jethrocephus Keepin' the party goin' since 1958

    Joined:
    Nov 6, 2004
    Oddometer:
    368
    Location:
    Raleigh/ Deep Gap, NC
    A long time ago:


    3F922032-0C02-4A6F-87EA-425BCA025692.jpeg

    Fast forward a few decades:
    95F738DE-ECD6-4BEC-96E5-4AEF295722A6.jpeg


    DF9C03B3-9F2F-4E93-B5F8-FD7322D469CA.jpeg

    If anyone has an excellent GPz aka ZX750E Turbo they’re tired of looking at and within 3-400 miles of Raleighwood, shoot me a message.
    #35
    aptbldr likes this.