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Frame numbers of K75 and K100 |
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The following chart is explaining the relationship between frame number and model. It gives only a rough picture, so you won´t be able to tell a production month by the frame number. In addition, newer models as from K1 to K1200 are missing.
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Frame number
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Type
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Suffix
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Model
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Production
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Code
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0000001-0010000
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K100
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83
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5/83-
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0501
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0010001-0020000
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K100
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RS
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83
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9/83-
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0503
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0020001-0030000
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K100
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RT
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84
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4/84-
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0504
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0030001-0033000
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K100
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(USA)
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84
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5/84-
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0511
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0033001-0033500
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K100
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83
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5/83-
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0501
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0040001-0043000
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K100
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RS (USA)
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84
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5/84-
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0513
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0050001-0053000
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K100
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RT (USA)
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84
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5/84-
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0514
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0060001-0061000
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K100
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RS (Authority)
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84
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9/84-
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0502
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0061001-0065000
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K100
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RT
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84
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4/84-
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0504
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0070001-0071000
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K100
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RT (Authority)
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84
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9/84-
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0505
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0080001-0090000
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K100
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RS
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83
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9/83-
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0503
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0090001-0100000
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K100
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RT
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84
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4/84-
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0504
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0140001-0145000
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K100
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RS
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86
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4/86-
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0503
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0170001-0175000
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K100
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RT / LT
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87
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9/86-
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0506
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0180001-0182000
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K100
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RT / LT (USA)
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87
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9/86-
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0516
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6308101-6309000
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K100/2
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88
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12/87-
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0521
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0100001-0110000
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K75
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S
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87
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3/86-
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0563
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0110001-0118000
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K75
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C
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86
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9/85-
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0564
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0120001-0121000
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K75
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(Authority)
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86
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9/85-
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0561
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0130001-0133000
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K75
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C (USA)
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87
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1/86-
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0574
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0150001-0155000
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K75
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S (USA)
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87
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3/86-
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0572
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6215001-6220000
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K75
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87
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9/86-
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0562
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What´s the production month of my BMW ?
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Regarding the K series, the frame number and engine number are not equal. As a deciding factor, most of the parts have casted-in the production month. For example, each brake hose has a white plastic ring showing its age, in case of the described K100 “BREMBO DOT3 07/83”. Even if the front brake hose was renewed some time ago, the rear one should be still original in most cases. Add-on components are usually slightly older than the engine as they are obtained from third-party manufacturers. In case of this K100 RS, the oldest part is a toolbox cover which shows the year 1982. On the other hand, a fairing part is from 1986 which may be a hint for an accident.
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Is this the original engine ?
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The key to the production date is the engine number, which is located below the oil filler. The scheme is as followed:
104EA 4383 3485
This engine number belongs to a K 100 eight valve (104 EA) which was produced in the 43rd week in 1983 (4383). 3485 is the number of this engine. By the way: this bike, a “RS”, was sold in May 84, so it was seven month old by this time.
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