Hilliard Extreme-Duty clutches are ideal for the everyday demands of go-karts and youth-model snowmobiles. Thermodynamically designed clutch shoe increases the clutch's capacity to absorb heat without damaging the clutch springs, thereby providing a longer service life, even in the most demanding applications. For use with engines up to 8 HP. No warranty. Returns on unused product only. USA.RECOMMEND 2 DROPS OF OIL FOR EVERY HOUR OF USE