Early CT70 Production Numbers and Build Dates: CT70KO to CT70K4

Discussion in 'Honda CT70/Z50 Registry' started by hornetgod, Apr 21, 2012.

  1. hornetgod

    hornetgod Well-Known Member

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    CT70KO: Built From: JUN 1969 (6/69) to AUG 1971 (8/71) Produced: 185,000

    CT70HKO: Built From: APR 1970 (4/70) to AUG 1971 (8/71) Produced: 65,000

    CT70K1: Built From: AUG 1971 (8/71) to JUN 1972 (6/72) Produced: 60,000

    CT70HK1: Built From: AUG 1971 (8/71) to JUN 1972 (6/72) Produced: 25,000

    CT70K2: Built From: JUN 1972 (6/72) to MAY 1973 (5/73) Produced: UNKNOWN (educated guess: 45,000)

    CT70K3: Built From: MAY 1973 (5/73) to JUN 1974 (6/74)? Produced: 32,907

    CT70K4: Built From: JUN 1974 (6/74) to Early/Mid 1975 Produced: 8,852

    CT70 '76: Produced: 5,529

    CT70 '77: Produced: 11,959

    CT70 '78: Produced: 6,881

    CT70 '79: Produced: UNKNOWN (educated guess: 7,500)

    CT70 '80: Produced: 8,599

    CT70 '81: Produced: 6,089





    It's taken me awhile to compile this information. Lots of research in the VIN registry, Ebay, Individual Posts, and Private Messages to get the most accurate numbers and build dates possible. These numbers are close estimates based on Build Dates, VIN's, and Production Runs. If anyone has a higher numbered VIN or conflict in build dates, please post in this thread of Private Message me and I will make corrections.
     
    #1 hornetgod, Apr 21, 2012
    Last edited: Jul 2, 2014
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  3. vintagehondatrailbikes

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    Hey HG,

    That's 421,759 units through 1975 and you are not including numbers produced over the next five years (1976 to 1980) using this sequence of serial numbers ?

    The Z50 still holds the record as Honda's #1 American all time best selling bike at 450,000 units while the CT70 was #3 at 380,000 units between 1969 and 1980. (#2 CB750 400k+)

    The mystery continues...

    VHTB
     
  4. hornetgod

    hornetgod Well-Known Member

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    The only number that may not be close is the K2. Every other number came from VIN's from last month built bikes. I rounded up to the nearest thousand. By the mid 70's, Trail 70 production numbers were only a few thousand per model.
    Where did you come up with your production number information? The numbers I've gathered show total Trail 70 number could total 420,000 to 450,000.
     
  5. kirrbby

    kirrbby Well-Known Member

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    I'll bet there are missing numbers between the high and low Vin #'s for each model. That would explain how the frame and engine numbers get so far off. Some imperfect frames were were probably scrapped along with their vin's during production.
     
  6. vintagehondatrailbikes

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    Kirrbby is correct. You can't count on every serial number in the sequence being produced.

    HG, are you including production post 1981 in your numbers? If so, those bikes were not included in Honda Japan's total CT70 production numbers and had a completely different serial number sequence begining with JH2D instead of the earlier CT numbers. This could possible mean that they were not produced in Japan or maybe by a Honda licensed manufacturer.
     
  7. hornetgod

    hornetgod Well-Known Member

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    I only estimated KO to K4 numbers around 400,000 to 425,000. The numbers beyond that would be a wild guess.

    I seriously doubt Honda scrapped thousands of frames. Each VIN tag went with a frame. Why would there be gaps in VIN's it makes no sense to me.

    I don't doubt the Honda 50 is the top production Honda but, It appears the Trail 70 numbers are higher than some first thought.
     
    #6 hornetgod, Apr 22, 2012
    Last edited: Apr 22, 2012
  8. scott t

    scott t Member

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    I would also consider warranty motors, My guess would be that these were just pulled off the line and sent to the dealer no matter what the VIN was.

    The only reason for my theory is a while back a seller on e-bay had a "claimed" brand new z-50 motor from the dealer with a VIN NO.around 280XXX if I remember correctly, So I would think the same could be for the ct motors.

    This is not fact by any means.

    Scott
     
  9. kirrbby

    kirrbby Well-Known Member

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    If the vins were stamped on the frames before some of the welds were made, and paint etc. they likely would scrap them rather than repair them. I work for GM at a metal stamping plant. I see the parts that are scrapped every day because they are not perfect and the repair is not cost effective. If the frame and motors match at the beginning of a model run, how do the numbers end up being so far apart. I doubt they stamped those vins on the frame after a complete defect free bike came off the line
     
  10. hornetgod

    hornetgod Well-Known Member

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    The whole engine to frame matching is an entirely different topic. I never worked in a factory but, It makes good sense to stamp a VIN at the END of the frame making process. I can't imagine thousands of frames being rejected, especially in a Japanese factory.
     
  11. CT70sKid

    CT70sKid Member

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    hornetgod,
    I think I have one of the last KOs. The vin # is CT70-284602. Have you seen any numbers later than this in your research? Just curious.
     
  12. hornetgod

    hornetgod Well-Known Member

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    You could have one of the last KO's made. Was it built in August of 1971 (check the VIN tag)? I had read of a VIN as high as CT70-291xxx but, I couldn't verify it.
     
  13. CT70sKid

    CT70sKid Member

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    Yes, I forgot to mention the date on the tag. It is 8/71.
     
  14. hornetgod

    hornetgod Well-Known Member

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    August 1971 was the last month of the KO production and also marked the beginning of the K1.
     
  15. hornetgod

    hornetgod Well-Known Member

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    I added '76, '77, '78 production numbers as per Honda Parts Catalog

    CT70 '76: Produced: 5,529

    CT70 '77: Produced: 11,959

    CT70 '78: Produced: 6,881
     
  16. hornetgod

    hornetgod Well-Known Member

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    I added 1978 to 1981 production numbers numbers to post #1. *Source-Service Honda Website*

    CT70 '78: Produced: 6,881

    CT70 '79: Produced: UNKNOWN

    CT70 '80: Produced: 8,599

    CT70 '81: Produced: 6,089
     
    #15 hornetgod, Jul 14, 2013
    Last edited: Jul 14, 2013
  17. Long Crapper

    Long Crapper Member

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    My blue '71 KO vin# is CT70-285100 and motor # is 284662 . The manufacture date is 08/71
     
    #16 Long Crapper, Jan 1, 2014
    Last edited: Jan 11, 2014
  18. 67Motorcat

    67Motorcat Member

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    Interesting thread,

    I went in the garage to check mine out as I remember is was built in September after reading here the last KO's were built in August.

    Now granted I got my Bike in a box of parts already disassembled,but came with a KO triple tree and was represented as a KO by the seller...never gave it a second thought.

    The original Vin tag arrived as shown (mangled and detached) as does indeed match the stampings on the frame.

    I stamped a new one to represent the #'s on the frame,you can see my trial/practice stamp mark "C" on the original tag.

    Question is,do I really have a K1?,do I have a 72' model?,and why is there an extra digit?...the last digit "9" is on the frame

    Thanks,now I'm curious
     

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  19. 67Motorcat

    67Motorcat Member

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    Well after a little more research I answered my own question...lol

    I have a freaking K1..all this time I thought I had a KO..

    It seems I have the first months production and the 14,079 one built that month,the first month...wow the factory sure pumped them out back in the day!
     
  20. hornetgod

    hornetgod Well-Known Member

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    I'm glad the thread helped. 7 digit VIN was a dead giveaway. 14,079 in first two months is a bit high but, does match other numbers I've seen. August 1971 was both the end of the KO and beginning of the K1 production run. September was actually the second month of production and since your number is so high, its a safe guess that it was at or near the end of September.
     
    #19 hornetgod, Jan 28, 2014
    Last edited: Jan 28, 2014
  21. CT70sKid

    CT70sKid Member

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    Wow, you may very well have the last K0 off the line! Very cool! Your engine # is closer to mine than my engine is, which is 284439. I wonder why the number of frames ran ahead of the engines? Could it be because they built extra frames for replacements? I have seen NOS frames on ebay.
     

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