Great book it starts out good with the begining listing all the basics, yes two stroke and then four stroke. My only dissapointed was that at least half of the manuel covers certain types of scooters. Naturally the most popular ie: Yamaha, Honda,Suzuki, and so on. If you fall into this category great your in luck and have a excellent manuel to refer back to as long as you own the scooter. Otherwise read the first few chapters take what you need then I put the book in my book shelve for future reference. The book seller went above and beyond the manuel was in great shape and I got it quickley kudos to him. As far as the manuel do more research prior to purchase unless it lists it has your bike in it.