hello, I am looking at a 71 R75/5. This bike has 115k on it and is in decent shape. The owner wants 2,500. The exterior and mechanical parts of the bike seem to be in decent shape considering the year and millage. I have never owned a BMW, I am more familiar with late model Yamaha 2 stroke enduros. I basically want to know if the price is fair and what to expect when buying a bike such as the R75/5. Like I mentioned I have never owned a BMW is there anything that I can look out for that is typical of this year and model mechanically? And also what is the normal compression for this engine? Thank you.