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Re: Calling all Dash Y and Y bike owners.. [Re: Kevin (NZ).] #789562 11/09/19 5:39 am
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Just found this topic and joined the BritBike Forum

My thoughts on the subject of "Y" numbers is this. I think it is a plausible explanation of what MAY have happened.

The British Government of the time taxed anything that moved. Perhaps the BSA Company had to advise the tax office of engine numbers of bikes that were to be built in order for the Government to collect Sales Tax ( or what ever it was called ). In 1967 they advised a block of numbers, say A65LA 5000 - A65LA 8000 , and paid the relevant tax at that time. For whatever reason, these numbers were never allocated to any machines built in 1967. Fast forward to 1970 and these numbers were still unused but BSA had already paid the tax for them. Instead of using a new set of numbers and paying tax, they decide to use the already taxed 1967 numbers. However, these numbers were from 1967 production year. So to use them in 1970 for the 1970 models, all they did was add a letter "Y" to the end of the number.

I know it sounds too simple, what with all the theories about bikes held for three years, strikes and so on. But it would explain what COULD have happened.

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Re: Calling all Dash Y and Y bike owners.. [Re: Kevin (NZ).] #789711 11/10/19 5:39 pm
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[Linked Image]The dispatch books list the machines as being dispatched twice, once in 1966/79 and then a second time in 1969/70.
There is a set of service sheets detailing the work required to upgrade the original 1966 machines to 1969 specification.
Speaking to Alistair Cave (who was head of the BSA production), the machines were sent to the USA in 1966, but returned unsold.

Attached Files 242-1.jpg242-2.jpg242-3.jpg242-4.jpg242-1.jpg

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Re: Calling all Dash Y and Y bike owners.. [Re: Andy Lorenz] #789725 11/10/19 8:06 pm
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Originally Posted by Andy Lorenz
There is a set of service sheets detailing the work required to upgrade the original 1966 machines to 1969 specification.
Thanks for posting those service sheets.

It's great to see the field upgrade information for the '-Y' (and apparently '-X') changes, which is handy information to have.

The later 'Y' (without the '-') machines are a whole different can of worms, because they have the later crankcases, etc. It seems unlikely that they were reworked at the factory to such an extent.
For whatever reasons, Al Cave's explanation seems to have some gaps. Unfortunately, he isn't around any longer to be able to provide more details, and there are probably very few remaining ex-BSA people left wh would have known the answer.

Re: Calling all Dash Y and Y bike owners.. [Re: Kevin (NZ).] #789751 11/10/19 11:28 pm
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Also doesn't explain the 68 "hybrid" Spitfires with 67 VINs but otherwise all 68 parts.

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