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Author Topic: 1977 CB550K Engine # and VIN Are Different?  (Read 1021 times)

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Offline cb_n00b

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1977 CB550K Engine # and VIN Are Different?
« on: April 26, 2017, 04:08:58 PM »
So I strangely never noticed this before, but the VIN on my 1977 CB550K is CB550K-2010964, but the number on my engine is CB550E-2010955.

Is this normal? I know the K and E are supposed to be different, but does this mean that my bike doesn't have the original motor in it? Just trying to figure out if my bike had the motor swapped at some point in its life.

Thanks as always! I can provide pictures if needed.
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1977 CB550K
- MotoGP Werks Exhaust / Stock Airbox
- Dyna S Ignition & Coils
- Motogadget M-Unit Blue
- 069A CB550F Carbs
- Beringer front brake kit

Offline calj737

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Re: 1977 CB550K Engine # and VIN Are Different?
« Reply #1 on: April 26, 2017, 04:15:52 PM »
They do NOT match from the factory. Not on any SOHC. You're fine. the VIN and engine serial tell you the year in which they were made, not which frame had which motor. The VIN tag and the neck should always agree (etched into he right side is the correct frame VIN).
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'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline cb_n00b

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Re: 1977 CB550K Engine # and VIN Are Different?
« Reply #2 on: April 26, 2017, 04:16:46 PM »
A couple of pictures just to clarify:

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1977 CB550K
- MotoGP Werks Exhaust / Stock Airbox
- Dyna S Ignition & Coils
- Motogadget M-Unit Blue
- 069A CB550F Carbs
- Beringer front brake kit

Offline cb_n00b

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Re: 1977 CB550K Engine # and VIN Are Different?
« Reply #3 on: April 26, 2017, 04:18:23 PM »
Quote from: calj737 on April 26, 2017, 04:15:52 PM
They do NOT match from the factory. Not on any SOHC. You're fine. the VIN and engine serial tell you the year in which they were made, not which frame had which motor. The VIN tag and the neck should always agree (etched into he right side is the correct frame VIN).

Appreciate the insight Calj...I finally have my bike purring really well and running like a top, I was starting to worry I had a frankenstein or something. Thanks again.
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1977 CB550K
- MotoGP Werks Exhaust / Stock Airbox
- Dyna S Ignition & Coils
- Motogadget M-Unit Blue
- 069A CB550F Carbs
- Beringer front brake kit

Offline flybox1

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Re: 1977 CB550K Engine # and VIN Are Different?
« Reply #4 on: April 27, 2017, 07:00:41 AM »
Very few bikes have VINs as close as yours are.
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
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Offline ekpent

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Re: 1977 CB550K Engine # and VIN Are Different?
« Reply #5 on: April 27, 2017, 07:23:59 AM »
Quote from: flybox1 on April 27, 2017, 07:00:41 AM
Very few bikes have VINs as close as yours are.
Yep- yours are closer than normal.
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