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The replacement parts for this spring are 0000 997 0912 and 0000 997 0911. Compatibility: Compatible with Stihl MS660 650 640 066 064 chainsaws. This clutch spring is made of high-quality metal, ensuring high strength and durability. Spring dimensions: 24.4mm (length) × 9mm (outer diameter) It controls clutch engagement and disengagement with stable tension, ensuring a smooth engine start and reducing the risk of slippage.