10-'16 for Yamaha YZ450F PRO CIRCUIT Clutch Springs cold weather breath box and

cold weather breath box and chin curtain

Triple chrome plated or black finish available

EPI's complete line of springs lets you tune the engagement and top rpm of your snowmobile

MPN: 0601-3509

Lockup design applies extra pressure to the clutch plates for positive engagement with no clutch slippage

10-'16 for Yamaha YZ450F PRO CIRCUIT Clutch Springs cold weather breath box andManufacturer: Pro Circuit MPN: CSY10450 CS Title: Clutch Springs Size: Option: Color: 12 15% stiffer than stock More positive clutch engagement Prevent clutch slipping Consistent spring performance Control how efficiently your clutch turns power into acceleration Sold as a set