there is no detailed manual but there is a exploded view of the engine in the back of the manual. The engine comes apart really easy thou. Just remove the head and then the 4 screws that holds it to the motor mounts. Then unscrews three screws on teh pull starter and then 4 more on the back plate. After that u will be able to see in side the engine very good. Spary some nitro cleaner and there then wipe it out. After that drop some after run oil in there and resamble just like you took it apart. Rember to use lock tite on the motor mount screws when u put it back together.
