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05 YZ450F Clutch Spring SPECS??

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i have an 05 yz450f ... just checked out the clutch... its the hardest clutch ive ever pulled ...... took it apart the friction plates are burnt and the clutch springs range from 42.00mm-47.00mm .... i have a manual but its an 07 manual and its says the 07's are 50.00mm just wondering if any one knows what stock is in the 05? so im gonna get an aftermarket clutch kit. just wondering if snyone knew stock spring measurements? THANX

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