XL125RC Engine ID Codes?

[XL125RC]

Hello all

I'm looking for some advice on the engine which originally came in the XL125RC. I just got a XL125RC 1983 but it unfortunately has had a 4 speed CG125 engine stuck in it at some point instead of the 6 speed XL motor which i can't imagine will be any good for green lane use.

I am trying to find a XL125/185/200 engine for it but i can't seem to find any so I've started trying to find the engine codes so i can search that way. Does anyone here know the engine ID codes for these engines? I *think* the 125 is L125SE but I'm not sure if this is for the 1970's XL's and if the 1980's ones were different or not.

Any help greatly appreciated and if anyone has a XL125/185/200 engine for sale please let me know.