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Thread: Finally got a Honda z50!

  1. #1
    Join Date
    Jun 2010
    Location
    Cold Lake, Alberta, Canada
    --
    2,990

    Finally got a Honda z50!

    I was recently in Southern Ontario and was chatting with my old friend about any and all vintage machines which we both enjoy immensely. He mentioned that at one of the places he picks up firewood he seen an older Honda 50 minibike sitting in the corner of one of the barns. Knowing that I wanted one, he talked to the owner and got it for $100.00 with potential transmission issues. I only have one picture but it looks fairly complete and I'm pretty sure I can fix it up for less than $1000.00 even with shipping costs to Alberta which is what they're worth up this way. The hard part is finding the darn things....fixing is easy
    Attached Thumbnails Attached Thumbnails z50.jpg  
    Trikes
    1970/71 US 90 (Aquarius Blue)
    1970/71 US 90 (Future Project)
    1972/73 US 90 Camo Project (110 Big Bore)
    1972/73 US 90 Green
    1977 ATC 90 w/83 110 motor (Fugly)
    1982 ATC 70
    1983 ATC 70 (Ladybug)
    1973 ATC 70

    1965 Marketeer 3 Wheel Golf Cart with 1986 Honda 250 drivetrain

    TF 2015

    Other
    1983 Honda Z50
    1978 Honda XL75

    Feedback http://www.3wheelerworld.com/showthr...ck-for-coopool
    http://www.3wheelerworld.com/showthr...k-for-coolpool

  2. #2
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,680
    Nice score
    78 atc 90/180cc Dickson Full Suspension
    76 ATC90/180cc Nicholson
    77 atc 90 Dickson Full Suspension
    84 KLT 110/123cc Powroll Racer from 80s
    87 atc 125m stock
    84 atc 200x Curtis Sparks
    84 atc 200x Powroll My race bike from 80's
    83 atc70/108cc Powroll blue Xmas Special
    81 atc185s HP-ATC full suspension

    Performance Shop is Open PM me for Service

    My Feedback http://www.3wheelerworld.com/showthr...ck+shortline10

  3. #3
    Join Date
    May 2015
    Location
    San Diego, CA
    --
    1,668
    I love it!

  4. #4
    kiser's Avatar
    kiser is offline Just Too Addicted Arm chair racerJust too addicted
    Join Date
    Dec 2008
    Location
    Coshocton Ohio
    --
    525
    Great find, they are a blast!

  5. #5
    Join Date
    Jun 2010
    Location
    Cold Lake, Alberta, Canada
    --
    2,990
    Fast forward almost 1 year and I finally have this beast at home. Physically it's in good condition with a clean tank, intact seat, good tires and decent plastics. All controls still move as it was stored indoors since parked. Wear on the handgrips don't show excessive use either. The bad is it does roll freely but the kicker won't budge the motor. The crankcase was empty when I got it so I filled it and the cylinder completely with ATF and fresh oil and let it sit for a few weeks....no change. I ordered a factory manual and will pull the motor and tear into it and see what surprises await. Kickstand1 mentioned I should look into getting the dents in the tank fixed using the paintless dent removal method. Once it's running I'll definitely do that.
    Attached Thumbnails Attached Thumbnails z50r1rr.jpg   z50r2r.jpg   z50r3r.jpg  
    Trikes
    1970/71 US 90 (Aquarius Blue)
    1970/71 US 90 (Future Project)
    1972/73 US 90 Camo Project (110 Big Bore)
    1972/73 US 90 Green
    1977 ATC 90 w/83 110 motor (Fugly)
    1982 ATC 70
    1983 ATC 70 (Ladybug)
    1973 ATC 70

    1965 Marketeer 3 Wheel Golf Cart with 1986 Honda 250 drivetrain

    TF 2015

    Other
    1983 Honda Z50
    1978 Honda XL75

    Feedback http://www.3wheelerworld.com/showthr...ck-for-coopool
    http://www.3wheelerworld.com/showthr...k-for-coolpool

  6. #6
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,680
    Nice score , I would pull the flywheel cover and rock the crankshaft back and fourth .
    78 atc 90/180cc Dickson Full Suspension
    76 ATC90/180cc Nicholson
    77 atc 90 Dickson Full Suspension
    84 KLT 110/123cc Powroll Racer from 80s
    87 atc 125m stock
    84 atc 200x Curtis Sparks
    84 atc 200x Powroll My race bike from 80's
    83 atc70/108cc Powroll blue Xmas Special
    81 atc185s HP-ATC full suspension

    Performance Shop is Open PM me for Service

    My Feedback http://www.3wheelerworld.com/showthr...ck+shortline10

  7. #7
    Join Date
    Jan 2009
    Location
    ohio
    --
    1,732
    Second that and you can use a stud welding gun to pull out the dents
    If its on the internet its got to be true they can't put any lie's on the internet

  8. #8
    Join Date
    Jun 2010
    Location
    Cold Lake, Alberta, Canada
    --
    2,990
    I took your advice and pulled the cover. I can freely spin the flywheel back and forth but then I'll hear a click inside and it stops. If I play around with it it goes again until the click then stops. Trans is all the way in neutral up as far as i can feel with the shifter. I don't think it's grabbing any gears as I push down at all. Maybe pull the head and see if the cam chain isn't broken or a valve dropped?
    Trikes
    1970/71 US 90 (Aquarius Blue)
    1970/71 US 90 (Future Project)
    1972/73 US 90 Camo Project (110 Big Bore)
    1972/73 US 90 Green
    1977 ATC 90 w/83 110 motor (Fugly)
    1982 ATC 70
    1983 ATC 70 (Ladybug)
    1973 ATC 70

    1965 Marketeer 3 Wheel Golf Cart with 1986 Honda 250 drivetrain

    TF 2015

    Other
    1983 Honda Z50
    1978 Honda XL75

    Feedback http://www.3wheelerworld.com/showthr...ck-for-coopool
    http://www.3wheelerworld.com/showthr...k-for-coolpool

  9. #9
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,680
    The older model z50 has a manual timing chain tensioner setup so if itís not maintained things happen
    78 atc 90/180cc Dickson Full Suspension
    76 ATC90/180cc Nicholson
    77 atc 90 Dickson Full Suspension
    84 KLT 110/123cc Powroll Racer from 80s
    87 atc 125m stock
    84 atc 200x Curtis Sparks
    84 atc 200x Powroll My race bike from 80's
    83 atc70/108cc Powroll blue Xmas Special
    81 atc185s HP-ATC full suspension

    Performance Shop is Open PM me for Service

    My Feedback http://www.3wheelerworld.com/showthr...ck+shortline10

  10. #10
    Join Date
    Jun 2010
    Location
    Cold Lake, Alberta, Canada
    --
    2,990
    That's what I'm leaning towards. I can feel vacuum when the piston moves slightly so i'll pull the tappet covers and see if anything is moving there. There's definitely something up with the transmission as I can't get it to go in any gear at the moment. We'll get her figured out soon enough. Thanks for all the input folks!
    Trikes
    1970/71 US 90 (Aquarius Blue)
    1970/71 US 90 (Future Project)
    1972/73 US 90 Camo Project (110 Big Bore)
    1972/73 US 90 Green
    1977 ATC 90 w/83 110 motor (Fugly)
    1982 ATC 70
    1983 ATC 70 (Ladybug)
    1973 ATC 70

    1965 Marketeer 3 Wheel Golf Cart with 1986 Honda 250 drivetrain

    TF 2015

    Other
    1983 Honda Z50
    1978 Honda XL75

    Feedback http://www.3wheelerworld.com/showthr...ck-for-coopool
    http://www.3wheelerworld.com/showthr...k-for-coolpool

  11. #11
    Join Date
    Jun 2010
    Location
    Cold Lake, Alberta, Canada
    --
    2,990
    Update: Appears that two of three bolts came out of the cam gear and the 3rd loosened off and caused some damage. The exhaust valve hit the piston and bent when it was out of time momentarily but didn't seem to hurt the piston at all. Unfortunately I'll need to replace both side covers as the cam was drifting back and forth and damaged both. What I'll do right away is:

    - replace both valves, guides and seals
    - replace both side covers
    - mic the bore and hone as required if in spec
    - bore out if above is not in spec
    - replace piston/rings

    Potential Fixes:
    -replace with new stock piston/rings if still in spec
    -oversize piston/rings if needed
    -replace cam gear
    -replace cam due to surface scratches (anyone think it's in too bad of shape?)

    I was very surprised how bad the muffler is compared to the rest of the machine. Lots of patching and will need a nut welded on for the side shield to bolt to.

    The transmission is still an issue but that will get looked at in good time.
    Attached Thumbnails Attached Thumbnails Cam Scratches r.jpg   Bent Valve r.jpg   Loose Bolts r.jpg   Muffler r.jpg   Muffler 2 r.jpg   Bore r.jpg  

    Piston r.jpg   Side Cover r.jpg   Valve strike r.jpg  
    Trikes
    1970/71 US 90 (Aquarius Blue)
    1970/71 US 90 (Future Project)
    1972/73 US 90 Camo Project (110 Big Bore)
    1972/73 US 90 Green
    1977 ATC 90 w/83 110 motor (Fugly)
    1982 ATC 70
    1983 ATC 70 (Ladybug)
    1973 ATC 70

    1965 Marketeer 3 Wheel Golf Cart with 1986 Honda 250 drivetrain

    TF 2015

    Other
    1983 Honda Z50
    1978 Honda XL75

    Feedback http://www.3wheelerworld.com/showthr...ck-for-coopool
    http://www.3wheelerworld.com/showthr...k-for-coolpool

  12. #12
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,680
    The cheap way out is to just buy a complete 70cc topend kit . Most are less than 100.00 and it’s a definite power boost .

    A kit like this .
    https://www.ebay.com/itm/28398662938...3ABFBMhuuspIdh
    Last edited by shortline10; 11-02-2022 at 05:38 PM.
    78 atc 90/180cc Dickson Full Suspension
    76 ATC90/180cc Nicholson
    77 atc 90 Dickson Full Suspension
    84 KLT 110/123cc Powroll Racer from 80s
    87 atc 125m stock
    84 atc 200x Curtis Sparks
    84 atc 200x Powroll My race bike from 80's
    83 atc70/108cc Powroll blue Xmas Special
    81 atc185s HP-ATC full suspension

    Performance Shop is Open PM me for Service

    My Feedback http://www.3wheelerworld.com/showthr...ck+shortline10

  13. #13
    Join Date
    Jun 2010
    Location
    Cold Lake, Alberta, Canada
    --
    2,990
    That's definitely a great option shortline. Curious, will the 70cc kit bolt on directly to the 50cc block? With CDN exchange and shipping it'll be around $200 but still cheaper than OEM I'm thinking.
    Last edited by coolpool; 11-03-2022 at 12:15 PM.
    Trikes
    1970/71 US 90 (Aquarius Blue)
    1970/71 US 90 (Future Project)
    1972/73 US 90 Camo Project (110 Big Bore)
    1972/73 US 90 Green
    1977 ATC 90 w/83 110 motor (Fugly)
    1982 ATC 70
    1983 ATC 70 (Ladybug)
    1973 ATC 70

    1965 Marketeer 3 Wheel Golf Cart with 1986 Honda 250 drivetrain

    TF 2015

    Other
    1983 Honda Z50
    1978 Honda XL75

    Feedback http://www.3wheelerworld.com/showthr...ck-for-coopool
    http://www.3wheelerworld.com/showthr...k-for-coolpool

  14. #14
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,680
    Yes it all bolts right in , cylinder will fit in the cases .

    You can also go this route and make a rocket ship lol .
    I’ve done a few and they get scary fast for a short wheel base .

    https://tboltusa.com/store/crf50-z50...0_122_124.html
    78 atc 90/180cc Dickson Full Suspension
    76 ATC90/180cc Nicholson
    77 atc 90 Dickson Full Suspension
    84 KLT 110/123cc Powroll Racer from 80s
    87 atc 125m stock
    84 atc 200x Curtis Sparks
    84 atc 200x Powroll My race bike from 80's
    83 atc70/108cc Powroll blue Xmas Special
    81 atc185s HP-ATC full suspension

    Performance Shop is Open PM me for Service

    My Feedback http://www.3wheelerworld.com/showthr...ck+shortline10

  15. #15
    Join Date
    Jun 2010
    Location
    Cold Lake, Alberta, Canada
    --
    2,990
    Yikes....no I'm lucky the mini bike is even allowed at my place after my sons bad motorcycle accident in 2012. Thanks for the ideas though :-)
    Trikes
    1970/71 US 90 (Aquarius Blue)
    1970/71 US 90 (Future Project)
    1972/73 US 90 Camo Project (110 Big Bore)
    1972/73 US 90 Green
    1977 ATC 90 w/83 110 motor (Fugly)
    1982 ATC 70
    1983 ATC 70 (Ladybug)
    1973 ATC 70

    1965 Marketeer 3 Wheel Golf Cart with 1986 Honda 250 drivetrain

    TF 2015

    Other
    1983 Honda Z50
    1978 Honda XL75

    Feedback http://www.3wheelerworld.com/showthr...ck-for-coopool
    http://www.3wheelerworld.com/showthr...k-for-coolpool

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