With the correct tools and a bit of time you can do a test to see if the crank seals are holding presure, but its important to keep in mind that you are buying a bike that is 20+ years old so you should probably factor in purchasing a new or rebuilt crank. When you say "9klm" do you mean 9000 ks? Either way genuine MC28 Rothmans are a very desirable and hard to find machine so good luck with your purchase.