ab engine code

[8adgerx]

my engine has ab as a prefix on the crank case, is this a 1300 tp ???
and if so is this usual ??

 

[Happystamps]

It's a 1300 in Europe but I believe they used that code for 1600s in the US. Either way they share an engine case, so it doesn't mean a lot. The only way to really tell is to pop off a cylinder head.