i've got a 1968 BSA 650 but i can't figure out the model, theres no vin (that i can find) on the motor and it doesnt look like its been grinded off. the ownership says that the vin is A6FXXXX but i can't find that online.
You should have the frame vin on the forward motor mounts, take some pics of the left side of the case right below the barrell, that should allso be where the motor numbers are.
You might have factory replacement cases....... There are no aftermarket cases for BSA's.
Scavenger, my frame is a '57 plunger and no there are no numbers under the barrels but there is a logo on the back of the motor under them, its a small oval with something in the center but im not sure what, i can't get a good look at it because the bikes together
O.K. listen carefully, cause i'm only gonna say this once more...there are NO NUMBERS under the barrels, i know where to look, but theres nothing there
Here's a couple pics. The first one, engine and frame numbers. I know you said you don't have any engine numbers. Look closely at your surface where the numbers should be. I'm talking good lighting and a magnifying glass. Does the surface look exactly like the cast surface elsewhere on the cases? BSA sometimes put periods or dots in the numbers and these got pretty deep. Is there any sign of those left? The original numbers for a '68 Firebird Scrambler would start with A65FB, the B indicating 1968. Those numbers would be on both the frame and the engine.
It's possible (but not likely) that you have a set of replacement cases. Dealers who rebuilt engines with replacement cases were supposed to stamp the numbers back into them, but they didn't always. (Same with replacement frames, and it's not as uncommon to find an OIF frame unstamped. A lot of those were replaced under warranty.)
The frame numbers in the first pic, a late '66 Lightning, were just stamped into the frame lug at the front motor mount. (BSA began using matching numbers in early calendar 1966, which was about the middle of the production year.) Later on, the frame lug was modified to have a flat pad. (see the second pic, a '69 Lightning with the numbering system BSA started using in the middle of that production year. The '69 and newer BSA twins also had the engine number on a raised pad, with little BSA logos lightly etched in the surface. Much harder to fake.) The third pic shows a frame number from '65. The '62-'65 unit twins had the frame numbers up closer to the neck and they all started with A50 regardless if the engine was an A50 or an A65. Those engine and frame numbers did not match. OIF frames (not shown) had the numbers back up by the neck too.
If your frame has no numbers, either it's an aftermarket frame, (pics would help, you must know someone with a camera.) or it's a stock frame with the numbers removed. Again, look really close at the areas where the numbers should be. If you see any evidence that the numbers, engine or frame, have been removed, I would take it back where I got it, explain to the guy he can buy it back or explain to the police why he sold you a motorcycle with altered numbers.
yes scavenger that is what my frame looks like and after reading about the unstamped replacement cases i'm convinced thats what i've got, as for the ownership, i'm wondering if someone copied it down wrong
also i don't know if this means anything but my case isn't smooth, there's a seem that goes from the barrels to the side cases
I bet there is a number under the black paint on the LEFT side of the engine case right under the barrels. I have seen shallow ass stampings on some bsa bikes My frame number is so shallow that a coat of primer obscures it 90% and one coat of paint covers it completly.
If that is the high temp paint that you buy at home depot for cast iron stoves then I can almost garantee that is where it will be.
take blue painters tape and tape off the area where the numbers should be and then take the spray paint remover from home depot and spray some into a glass jar or bowl (OUTSIDE) and then brush it on the area you want to remove paint.
Sometimes the numbers are stamped very shallow. Wire brushes, wheels and sandpaper may rub them out permanently. Because they are so shallow, primer and paint can hide them.
OK, I removed the paint and there's no vin but you can see the casting marks ( dimples in the metal) so it hasn't been ground off now my newest question is should i leave it the way it is and tell people ( cops, licensing center, guy doing safety, etc.) that they are factory replacement cases or take my stamp set and stamp the vin on the ownership into the case
68 Doesn't need Signals , Day running Light and barely needs a Horn so what are they looking at?
Tires?
Go to Princess auto and buy Stamps and stamp the Motor to match the ownership you got with the bike
If the true vin is A65F then it's a 69
which going by your A6F-XXXX it is
If it's a 68 then it's A65FC (Single carb)
Hope this ends some of your Confusion and Take all that shitty black paint off
Or Buy a Shit load of Gaskets and seals
Since you'll need to replace every time it over heats
buy some 50W oil and have a Drain bung welded to the sump cover
i was planning on removing the black paint and as for the year the ownership says 68 and for the vin it is A6F30XX
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