Check out near the bottom of this page...it shows various cross references:
The W240 T1 is a 14mm 1/2" reach plug. In the Bosch variety, that should be W4AC or W4A2 as shown in the PDF file above. NGK B8HS or B7HS (different heat ranges) will work. This page breaks down the NGK numbering system:
This page has many cross references:
Vech posted on another forum to not use a Champion plug...he probably knows what he's talking about. Most likely, there's not a good control on the threads.
HTH...Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2
Contains all things regarding BMW spark plugs.
Equivalents are at the lowerpart of the article.
Do not leave this page without going to the Technical Index and bookmarking it! Good Luck!
Huntington Beach, CA
What is the modern day closest match to that plug (either Champion or Autolite)?