Frame difference over the years

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rarestamx

New Member
Question about the difference between a 1974 z50 frame and a 1984 z50r. without a frame number or tag, Is there any visual difference between the two of them. If one bought a replacement frame 40 years ago from Honda, Would it not be stamped with a correct year serial number.
 
Z50nut

Z50nut

Active Member
The most notable difference is the large tank mount near the steering stem on the 84. That frame is a little longer than a 74. Honda did not stamp replacement frames.
 
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Robert thran

Robert thran

Well-Known Member
I have a 40+ year old new replacement frame for a ct70 k-0 and it has no vin stamping..so if they ever did sell the z50 frames back in the day I would guess they would not come with a vin stamping either? The part number for a k-3 k-4 frame is 50100-120-000B so I’m sure at one time they were available?
 

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R

rarestamx

New Member
rarestamx said:
Question about the difference between a 1974 z50 frame and a 1984 z50r. without a frame number or tag, Is there any visual difference between the two of them. If one bought a replacement frame 40 years ago from Honda, Would it not be stamped with a correct year serial number.
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Z50nut said:
The most notable difference is the large tank mount near the steering stem on the 84. That frame is a little longer than a 74. Honda did not stamp replacement frames.
Click to expand...
Thank you I'm new to these bikes. Frame has that bulge. Bought this at a estate sale mostly complete, Has the teardrop tank and rear top shock mounts Are the solid newer style. Seat frame mounts to shock studs. No mounts for push in side covers, Swing arm has the lower chain guard mounts. Engine serial says 84 z50r, But the frame is stamped 309210 which research says is 1974. Did frame numbers start over on the 50r models. Frame was original red, Painted over yellow for some reason. No rivet holes for a model tag on steering stem like it never had one.
 
R

rarestamx

New Member
Robert thran said:
I have a 40+ year old new replacement frame for a ct70 k-0 and it has no vin stamping..so if they ever did sell the z50 frames back in the day I would guess they would not come with a vin stamping either? The part number for a k-3 k-4 frame is 50100-120-000B so I’m sue at one time they were available?
Click to expand...
Thank you.
 
dirtbkr188

dirtbkr188

Well-Known Member
According to the Honda Motorcycle Identification Guide, the 1974 Z50AK5 had a frame number of Z50A-5000001~. The last model year with a 6-digit frame number was the '70-'71 Z50AK2 - Z50A-270236~ and is a hard tail frame model. If you have a 17-digit frame number and the last 6 digits are what you posted above, then the frame is an '82 Z50R.
Post some pics of your bike and we will be able to help you more, and include the engine VIN number as well
 
Z50nut

Z50nut

Active Member
Visually appears to be an 80s frame. Bottom end of engine sure looks to be mid 80s honda. Is it possible the data plate was removed from the stem, and rivet holes and serial number stamping were filled? A bit of sandpaper on the steering stem may reveal more.
 
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rarestamx

New Member
Z50nut said:
Visually appears to be an 80s frame. Bottom end of engine sure looks to be mid 80s honda. Is it possible the data plate was removed from the stem, and rivet holes and serial number stamping were filled? A bit of sandpaper on the steering stem may reveal more.
Click to expand...
Thank you. Will be stripping frame to go back red. See what shows up.
 
Z50nut

Z50nut

Active Member
Trying to align your engine to a frame year but unable to clearly see the first couple of digits. What are the first two digits?
 
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rarestamx

New Member
Others have said the frame number is last 6 of the 17 digit serial number making it a 82 frame. So guess I will think it’s 82 with newer engine.
 
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