CT70 VIN Clarification

Discussion in 'General' started by Hoebster, Oct 3, 2019.

  1. Hoebster

    Hoebster New Member

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    Hey wise experts,

    I have a Blue CT auto with a matching frame and engine VIN#!
    In some of the research I have found, since my vin starts with CT70-282798 some sources say it is an HKO , but these have the separate speedo / headlight! Mine has the integrated headlight which says vin should start with CT70-1!
    I know people swap stuff! My side decal says Trail 70. It has Black Frame Sticker with White Honda lettering!

    I am in Seattle and new to this niche tiny bike!

    Thanks,
    Jeff
     

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  3. hrc200x

    hrc200x Active Member

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    Its a late build (probably last month production) saphire blue ko. They had to start using 2 as the first digit because they made so many of them. If it was a 7 digit vin then it would be a k1 and newer. This late ko probably has the short carb top and plastic battery tray liner?
     
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  4. Hoebster

    Hoebster New Member

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    So, what are the other colors that were this vintage? Blue, Candy Red and ?Gold or ?Orange?
     
  5. hrc200x

    hrc200x Active Member

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    KO 3 speed colors were candy saphire blue, candy ruby red, candy gold, KO 4 speeds aka HKO, colors were candy blue green, candy emerald green, candy topaz orange. The 4 speeds have the main frame decal that goes back at a angle.
     
  6. Gary

    Gary Well-Known Member

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    Well by the serial number it's not an H anyway decals or no decals
     
  7. airblazer

    airblazer Member

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    My 1/71 K0 vin starts with a 2. Got any more pics of your bike Jeff? Does it run?
     
  8. hrc200x

    hrc200x Active Member

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    HKO's did not have a separate headlight/speedo, it was combined like the KO automatics. Separate speedo/headlights came in '72 also known as K1's. Both autos and 4 speeds in '72 were available in candy yellow and candy ruby red with a different looking main frame decal than KO's and completely different front shocks as they were oil filled and not springs with grease like the KO's/HKO's. Frame VINS on H bikes start out CT70H-xxxxxx, motor vins start out CT70HE-xxxxxx
     
  9. OLD CT

    OLD CT Well-Known Member

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    If it is a exact match it's worth ALOT of money. Let's see the match...
     
  10. Hoebster

    Hoebster New Member

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    D5DFD1FF-BD6A-4DE3-A318-31F338FA8262.jpeg 46FCE044-A168-4B08-BB0D-C1D3C8489B8B.jpeg
    Here is a picture of the engine!
     

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  11. OLD CT

    OLD CT Well-Known Member

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    Not a exact match but matching. Tall carb cap on a late K0 build.
     
  12. Hoebster

    Hoebster New Member

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    Would this have been changed or original since both frame and engine are CT/ CT70E-282 to start with?
    I thought someone said they did this at factory!
     
  13. Hoebster

    Hoebster New Member

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    Is the tall carb cap the norm or not?
     
  14. OLD CT

    OLD CT Well-Known Member

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    It is normal/original. Once in a ''rare'' while they can be exact and are the highly sought after by collectors. The tall cap style is more common on a K0, but at some late point, they switched to the short cap style that are on the next model year or K1.
     
  15. hrc200x

    hrc200x Active Member

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    To me that looks like a tall throat carb with a tall cap, which is mis-matched parts. If the stamping number on the top of the mount flange on the left is AT7B and this measurement shown in this picture is what yours is the carb is probably original and just the cap has been changed. If the stamping on the mount flange is 533a or 594a or HT7A its the wrong carb. If your going to try and souce the correct parts the slide length changed also with the different height throats and caps. Can you take a picture of the battery box?
     

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  16. Hoebster

    Hoebster New Member

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    If these aren’t good enough, I will be glad to take a few more of battery box!

    Thanks, Jeff
     

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  17. racerx

    racerx Administrator
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    That's a late-production K0, for sure. Same battery box was used in the K1 & K2 models.
     
  18. Hoebster

    Hoebster New Member

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    Ok so my carb is an AT7B Keihn is something wrong with cap or year for bike?
     
  19. hrc200x

    hrc200x Active Member

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    If your measurement is the same or very close to the one in the picture I posted up above its probably the correct carb. They made two different carbs stamped AT7B one with that measurement, and another was shorter, the shorter one takes the carb top you have. The tall slide throat takes a carb top that looks like the one in this link: https://www.ebay.com/itm/New-Carb-f...859553&hash=item1ef997b24a:g:xYcAAOSw7VJcxndY The slide lengths changed too so will have to figure out which one you have and which is correct, while you have it apart write down what your needle says, there are numbers/letters just below the clip grooves.
     
  20. Hoebster

    Hoebster New Member

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    I am checking, will get back to you
     
  21. vintagehondatrailbikes

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    Original K0 "short neck" AT7B carburetor had three versions. The first change came at VIN #242074 in January 1971 and then changed again at VIN#270640 in May/June 1971. I believe the second change was the "tall neck". The tall neck required the taller slide, the shorter cap and the longer cable. I have only seen one of the late K0 carbs. As you can see in the photo, the neck of the K1 carb on the right is taller. The slide is taller and the cap is shorter compared to the K0 carb on the left. This is true for the 594A K1 4 speed and the 533A 3 speed carbs which were used through 1977.

    Dqr15-Fu_8riiYDRxYJ4f8nzsZvnDuIVaG_tw-nNMaU6Onjg19HApg7UGZ3uhUsYels_Jcdj&_nc_ht=scontent.ffcm1-2.jpg
     

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