The fourteen Jf650-b3 Jetski 1991 Usa Canada / Ts Cylinder Head/cylinder component parts are all listed in this schematic.
A sample from the products for the Cylinder Head/cylinder include: Gasket,cylinder Base (nas), Washer,8.2x18x1.5, Gasket-head (nas), Stud,8x43.
With fourteen applications this Nut,cap,8mm is the most specified part.