In regards to the original poster, wasn't the '67 Lightning only available with Monoblocs regardless of early versus later? Is this a case of a Y or -Y bike, which came with a mix of parts?
You are correct. The '67 Lightning came with Monoblocs, and true '67 Lightnings are -Y machines (after #4144). Nothing on them is '69/'70.
"Y" bikes are '69 and '70 model year machines. They do not have any '67 parts on them (unless the parts are common among all the included years span). They are '69/'70 true and true, and with concentrics. Nothing about them is '67.
Originally Posted By: John Bakker
Marc B you hit the nail on the head. This is a Y engine.
Now we are getting the rest of the story. If your Lightning is a "Y" engine and frame, then it is a '69 or '70. It would have all of the features of '69/'70 and none of the '67 model year (unless it's a bitsa). Images of the engine and frame stampings would helps us confirm what you have.
1967 BSA Wasp 1967 BSA Hornet (West Coast Model) 1967 BSA Hornet (East Coast Model) 1968 BSA Firebird Scrambler 1968 BSA Spitfire Mark IV
Gary, Here are pics(I hope) of my engine & frame #s. The bike is registered as a '69 and the 'CC' in the numbers confirm that. The engine #'s are not matching and because they start with 'A65 LA', I assumed the engine was a 1967. Does the 'Y' change all that? Is this possibly the original engine for this frame? Appreciate the input from you guys who live and breathe BSA. Cheers, John
I have a 1969 Firebird Engine & frame number EC22...A65F so May 69 but came out of the factory as a 1970 model and first registered Gloucestershire so never went to USA. When I bought it with 11,000 miles on clock in 1981 it was a heap of .... Amongst the problems West Coast gearing (17 tooth gearbox sprocket). Was also fitted with 2 stroke concentrics at the factory and absolutely useless unless on full throttle. I thought the Y stamp was put on at the factory for unsold machines returned to the factory which were then updated and sold as a later model year.