I read somewhere that you can measure the amount of front fork oil by removing the top cap and inserting a welding rod then measuring the length of the rod that is covered in oil. Does anyone know the correct depth this should be on a 1980 R100?
Also, though I changed the oil, the front forks "drop out" when going over a curb or hitting hole. If is "get on it" from a stop I can make the forks "clunk" in first and second gear. I know there is something wrong but not what is wrong. Any ideas?