Only if the author has been acknowledged as an expert by reliable books newspapers and magazines Otherwise it doesnt meet Wikipedias policy of Identifying reliable sources For example Kevin Ash is a journalist and published author and so his personal site on motorcycles is considered an acceptable source for some types of information I dont see what the problem is Why cant people just go to kcom instead of Wikipedia for this information I can think of many other similar personal web sites that focus on a single model of motorcycle which also dont meet Wikipedias standards but that doesnt prevent people from getting the information