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Thread: Atc 90

  1. #1
    Join Date
    Jan 2020
    Location
    Grand valley
    --
    6

    Atc 90

    Hello, I have what I believe is a 1973 ATC 90. It has a serial number of us90 203518, if I’m reading it correctly,I’m wondering if this unit would’ve originally had the balloon tires and I know it’s supposed to have a metal fender it has a headlight that’s not currently on it I do not have the engine number at this time. Can anybody verify exactly what year this ATC is. I would like restore it some what I have had a lot of fun riding this thing as you can see. I was not the person who painted it it was red and all the decals are under the paint any info would help thanks, steveClick image for larger version. 

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  2. #2
    Join Date
    Jun 2010
    Location
    Cold Lake, Alberta, Canada
    --
    3,001
    You are correct in your assumption for your frame serial number. 1972/73 (K1 Models) had frame numbers US90-200001 and upwards. Things changed in 1974 as far as serial numbers go to an ATC90 prefix. Look down by the shifter and you should find the engine serial number. If it's US90E-1100001 and upwards then it's also a 1972/73 engine. Yes your model should have had the balloon tires on it but the upgrade is allowing you to ride guilt free. Check in the little pocket at the front of the seat between the fibreglass and seat material and you just might find a toolkit! And does it still have the tire pump on the right side of the frame, score if it does but most don't have it? I'd consult with an automotive body shop to see if you can remove the black paint, it appears to be spray bombed at the most.
    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

  3. #3
    Join Date
    Apr 2012
    Location
    USA
    --
    4,114
    Any photos of the hubs/axle setup? The balloon style tires had a super small bolt pattern and the splines used were very corse, while the newer hubs was a larger bolt pattern and used a finer spline style. Just wondering if you have the stock axle with different hubs, or someone swapped the whole axle out.

    As for year identification, the frame number starting with US90 2* indicates 72-73 as stated before. Another way to reference the model is that it's an ATC90 K1 as both years are the same.

    For the engine, you could validate the year at my site below, with out looking at the code I'm pretty sure it runes off the same logic/rules. The site supports all Honda 3 wheelers, so you could validate the frame and engine numbers match on all of your machines.


    https://atvmanual.com/honda/interact...er-atv-and-atc

  4. #4
    Join Date
    Jan 2020
    Location
    Grand valley
    --
    6
    No pics at the moment but there really tiny with some adapter plate to the larger rims the rear splines are quite course compared to the other machines I have I will snap some more pics when I can

  5. #5
    Join Date
    Jan 2020
    Location
    Grand valley
    --
    6
    I didn’t find the tool kit and I know I didn’t have a pump I would have kept it if I found that when I get things cleaned up in my shop I’m going to start working on it more and I’ll snap some more pics

  6. #6
    Join Date
    Apr 2012
    Location
    USA
    --
    4,114
    I see, makes sense then. Sounds like it has the original axle/hubs and the adapter plate on out is all that's changed. You could convert back if you really wanted at any time. The stock splines are huge, like 1/4in wide while the later ones are tiny, say 1/16in wide. Something like 6 spline vs 24 (just random numbers I pulled out of nowhere for an example).

  7. #7
    Join Date
    May 2013
    Location
    Brownsville, Tn.
    --
    1,271
    Has a fairly rare Hondaline rear rack......has 110 foot pegs.....
    * 1978 ATC 90/180 Pauter PJ1 / Springer "Team BAPP" Bike *

    * 1980 ATC 110/180 "Danny's Machine Works" 3D Sprint Dune Bike *

    * Nicholson 500 Race Bike *

    * HPATC Yamaha RD350 "Big Moe" Trike *

  8. #8
    Join Date
    Jan 2020
    Location
    Grand valley
    --
    6
    Quote Originally Posted by Joseph Farrow View Post
    Has a fairly rare Hondaline rear rack......has 110 foot pegs.....
    I have the original fold up foot pegs there not installed because of the 125m exhaust, I’m not sure what happened to the original exhaust pipe but the other interfered with the original foot pegs

  9. #9
    Join Date
    Jun 2010
    Location
    Cold Lake, Alberta, Canada
    --
    3,001
    Quote Originally Posted by Joseph Farrow View Post
    Has a fairly rare Hondaline rear rack......has 110 foot pegs.....
    Good catch, I didn't even see the rear rack poking out!
    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

  10. #10
    Join Date
    Apr 2011
    Location
    Connecticut
    --
    1,605
    Nice score on 90 73!.

    What does it take to remove the original rear tires from the rear axle? There is a plastic cap does that pull off? Does it require a tool to not break it?

  11. #11
    Join Date
    Apr 2012
    Location
    USA
    --
    4,114
    Yep have to pop the rubber cap off to access the 3 wheel nuts. Also could remove the axle nut and pull the whole hub off with the tire. The cap is rubber, so it should flex off, but with age it gets brittle so it might require damaging it to remove. Not sure if there's something to apply to the rubber to soften it or not.

    https://www.partzilla.com/catalog/ho...ear-wheel-axle



    Honda continued to use that basic idea/design in their lawn tractors from the late 1980's (I have a few of these mowers lol). Same setup except they have an actual rear diff (transmission is part of it, shaft drive!), and there's no lug nuts for the rim, the rim is also the splined hub. I'd dare to say the lawnmower rims would probably fit a lot of the 3 wheeler axles.

    https://www.boats.net/catalog/honda/...999/wheel-tire

  12. #12
    Join Date
    Jan 2020
    Location
    Grand valley
    --
    6
    Quote Originally Posted by sledcrazyinCT View Post
    Nice score on 90 73!.

    What does it take to remove the original rear tires from the rear axle? There is a plastic cap does that pull off? Does it require a tool to not break it?
    I had the whole hubs off like ten years ago it’s funny because that’s how I wound up with it,the kid that owned it thought the axle was bent so I bought it super cheap and when I got home all I found was loose wheels and loose hubs I think I shimmed the hubs so the nut held tighter or something and tightened the wheel nuts and I’ve been abusing it ever since I honestly don’t know how the fenders haven’t broke on it,if I had know what it was I probably wouldn’t have ridden it so hard

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