Fitment：For Predator 212cc Only Hemi Engine Go Kart Cart. Package Includes:A Connecting Rod,18lb Valve Spring,Flywheel,Gasket kit,Piston Kit,Magnetic Oil Drain Sump Plug Kit. When tightening the bolts, don't tighten them all at once. Tighten them in three stages to avoid stripping.Rod bolt torque: 170 Inch/lbs. These springs will provide extra performance at over 7000RPM. Length and Rate Tolerance will vary from spring to spring. The flywheel is made of a stronger aluminum material,reduced resistance, higher speed, increased power, can withstand greater pressure, in the case of maintaining high speed, can also be a good control of the valve, and reduce wear, effectively reduce the fault situation，the thread design plays a better fixing role.