1975 KAWASAKI Z1B

Discussion in 'Some Assembly Required' started by Fast Idle, Apr 5, 2018.

  1. Fast Idle

    Fast Idle Since the Sixties

    Joined:
    Nov 9, 2012
    Oddometer:
    1,365
    Location:
    The Great Land
    Always looking for cool old bikes to bring back and the Kawasaki Z1 has been on my list for a long time.
    We''ll it finally happened and I found this one, or should I say this one found me. It's great to have friends help find these bikes.
    It's a bit rough in some areas but 98% complete. Looks to be mostly stock other than the period bolt-ons like the Windjammer fairing, pimped out seat, and the Kerker exhaust. Mostly just weathered. No real signs of being thrashed.
    It will need a lot of work but should be a sweet ride once again. A chance to return this former king back to the street!

    75Z1B (1).JPG
    75Z1B (2).JPG
    75Z1B (3).JPG
    75Z1B (4).JPG
    #1
    9Realms, motocopter and Beezer like this.
  2. MATTY

    MATTY BORDER RAIDER

    Joined:
    Jun 23, 2014
    Oddometer:
    2,100
    Location:
    England On the Scotish border
    Awesome i am in .... i had the exact same model Z!B model back in the late 1970s , I had straight handlebars on mine the stock bars were too high for my liking , unfair ed wind resistance was uncomfortable if trying to cruise 70 to 80 mph the flat bars were a great move i found.
    Brilliant bikes i had some great times on mine i loved that bike, an d back in the day they were the top performers in the japs at least.
    Looking forward to seeing this reincarnation develop. .
    #2
    Fast Idle likes this.
  3. more koolaid

    more koolaid Been here awhile

    Joined:
    Nov 5, 2015
    Oddometer:
    262
    Location:
    Bel Air Md.
    :dukegirl
    #3
    Fast Idle likes this.
  4. Pezz_gs

    Pezz_gs Cant ride for crap

    Joined:
    Nov 13, 2004
    Oddometer:
    4,677
    Location:
    Sydney Skunkworks
    Awesome :super

    I have a '86 Z1300 in storage waiting in the cue for some lovin' and this will inspire me :thumb
    #4
    Fast Idle likes this.
  5. Fast Idle

    Fast Idle Since the Sixties

    Joined:
    Nov 9, 2012
    Oddometer:
    1,365
    Location:
    The Great Land
    Couldn't wait to get rolling on this bike. It's still going to be a fall project but I'll be working on it here and there this summer.

    75Z1Bh.jpg
    The fairing had to come off!

    75Z1B (9).JPG
    #5
  6. Kai Ju

    Kai Ju Long timer

    Joined:
    Jul 29, 2009
    Oddometer:
    3,252
    Location:
    Long Beach, California
    Yeah, ...subscribed. Thanks for starting another educational thread, we all appreciate watching you work your magic.

    Couldn't help but notice a CB750 single cam and an Airhead in the back ground.
    What's the story on those ?


    Notice how I ignored that modern Orange bike ?
    #6
    MATTY, Fast Idle and ArdenLoneWolf like this.
  7. villageidiot

    villageidiot Long timer

    Joined:
    Apr 29, 2010
    Oddometer:
    7,000
    Location:
    Orange County, CA
    excellent, this is going to be great!
    #7
    MATTY, more koolaid and Fast Idle like this.
  8. Fast Idle

    Fast Idle Since the Sixties

    Joined:
    Nov 9, 2012
    Oddometer:
    1,365
    Location:
    The Great Land
    Story is it's just about riding season up here and even though there's still snow on the ground the streets are looking pretty good.
    My friends and I can't wait to get back on two wheels. As you probably surmised, we like the vintage bikes. The CB belongs to a friend and he brought it over for a tune-up and to get the front brake fixed. Also had to replace the airbox to carb rubbers that no longer fit. They shrank so much they no longer sealed. It's all good now and ready to roll.
    20180405_133145.jpg

    The airhead belongs to another friend and it's just now getting finished up after being out of action for an engine rebuild. It's an R90 cafe bike and he wanted some power upgrades.
    It now has a Siebenrock 1000cc kit, a 336 cam and 38mm Dellorto carbs. Hopefully get it finished today and fire it up. It's an older build so it's getting some other attention too.

    DSC00077.JPG

    DSC00082.JPG
    DSC00081.JPG

    And as fun as the vintage bikes are, they don't go where the adventure bikes do. Hence the modern orange bike... :photog
    #8
    nzrian, JagLite, Ironforge and 4 others like this.
  9. Kai Ju

    Kai Ju Long timer

    Joined:
    Jul 29, 2009
    Oddometer:
    3,252
    Location:
    Long Beach, California
    Thx for the explanation. Are those repro or oem intake rubbers ?
    I remember you talking about the Airhead in another thread and I understand your sentiment about the Orange bike and its capabilities.
    #9
    MATTY likes this.
  10. r60man

    r60man Long timer

    Joined:
    Mar 14, 2013
    Oddometer:
    1,402
    Location:
    Robesonia PA
    How was that Seibenrock kit to install. I keep toying with the idea for my R75/6 but then I think I will need new carbs as well, even more $$$$.
    #10
  11. Beezer

    Beezer Long timer

    Joined:
    Oct 26, 2004
    Oddometer:
    8,260
    Location:
    Anchorage, formerly Spenard (hub of the universe)
  12. Beezer

    Beezer Long timer

    Joined:
    Oct 26, 2004
    Oddometer:
    8,260
    Location:
    Anchorage, formerly Spenard (hub of the universe)
    you guys know about wintergreen oil on old rubber right?
    #12
    MATTY likes this.
  13. Wildebeest90210

    Wildebeest90210 Long timer

    Joined:
    May 24, 2013
    Oddometer:
    2,027
    Ok, so first it was a winter project, now I see it's been brought forward to a 'fall' project with a summer caveat...Well look forward to it happening this week...:kumbaya
    #13
    villageidiot and Fast Idle like this.
  14. Fast Idle

    Fast Idle Since the Sixties

    Joined:
    Nov 9, 2012
    Oddometer:
    1,365
    Location:
    The Great Land
    OEM Honda! Still available.
    #14
  15. Fast Idle

    Fast Idle Since the Sixties

    Joined:
    Nov 9, 2012
    Oddometer:
    1,365
    Location:
    The Great Land
    Pretty easy really. Had to buy and install R100 push rod tubes and rubbers. They are bigger in diameter than the /6 ones.
    Also uses R100 head gaskets.
    #15
  16. Fast Idle

    Fast Idle Since the Sixties

    Joined:
    Nov 9, 2012
    Oddometer:
    1,365
    Location:
    The Great Land
    Yes, it makes the old rubber smell like wintergreen!:photog
    But really these rubbers were done, done. New ones cheap.
    #16
  17. Fast Idle

    Fast Idle Since the Sixties

    Joined:
    Nov 9, 2012
    Oddometer:
    1,365
    Location:
    The Great Land
    The Honda 750 and R90 Cafe both left today so I have my shop back to work on the Z1!
    Fired up the Cafe and did a quick carb balance and timing check. It sounds pretty mean.
    #17
    JagLite, villageidiot and Beezer like this.
  18. villageidiot

    villageidiot Long timer

    Joined:
    Apr 29, 2010
    Oddometer:
    7,000
    Location:
    Orange County, CA
    Happy valves are tappy valves
    #18
    Kai Ju likes this.
  19. kevlar930

    kevlar930 Been here awhile

    Joined:
    Jul 3, 2008
    Oddometer:
    552
    Location:
    Philly
    Another Fast Idle build. I'm definitely in!
    #19
    Fast Idle likes this.
  20. Fast Idle

    Fast Idle Since the Sixties

    Joined:
    Nov 9, 2012
    Oddometer:
    1,365
    Location:
    The Great Land
    OK, you got me. I'm addicted to this stuff. :dutch
    There was no way I could wait until winter or even fall to take this bike apart and see what kind of shape it's in. It's actually in pieces right now.
    Had it on the lift to remove the fairing and look it over while I was waiting for Honda parts to arrive. Couldn't stop with the fairing right? :evil.
    I knew the engine was weather seized when I bought it so I was curious to see how bad. The engine needed to come out so I could have a look inside. I think the bike sat for years with the carbs off.
    FrameTD (1).JPG

    Too bad it wasn't stored better. Mods from the past included an oil cooler, Kerker 4 into 1, some aftermarket coils, and an airfork kit with stiffer springs.
    FrameTD (17).JPG
    All in all a pretty complete bike with lots of potential.

    FrameTD (25).JPG
    engineout (1).jpg
    #20