I have a BSA C15 (1960 according to log book)
However not sure if the engine is a 59 or 60 and needing to order some parts.
Can anyone please tell me what year this engine number is C15 27243
For some reason I can't make a direct link work, but one way to find out the age of your BSA engine would be to go to the "draganfly" website , that is how it is spelt (!) website, click on the "BSA shop and info" link on the left hand menu then click on the "articles and tech info" link , then the " frame and engine numbers" option.
This should give you a listing of all the various BSA machines with their engine numbers.
It looks a bit confusing at first.
I may be wrong but using that list, your engine seems to be a 1961 model...but as I say I may have misread it!
Hope that makes sense and is of use.
Thanks for that, a 61 would be OK difference in part nos between 59 and 60-65