I bought an R80 G/S yesterday and was told after the fact that it has a complete R100 engine in it. I was a little annoyed at first that I didnt know this before hand but am over it now. The bike rips. I definitely see myself doing a thorough rebuild on some level in the future and I need to know exactly what the engine is. I looked near the oil filler but did not see anything stamped there. Is there another place that I may be able to find an engine number and hopefully be able to pinpoint its production year/type?