2025 Yz450f Hp Smart. Follow motocross action through day one of testing on the 2025 yamaha yz450f at glen helen raceway. The new 2025 solid one piece engine mounts are 8mm.

The 2025 yz450f comes with a 56n/mm spring instead of a 58 n/mm like the 2024 does. I have tested my 2024 yz450f (with 2025 linkage) with fcp race cups against my stock 2025 yz450f and my 2024 machine with fcp races is much calmer and easier to ride.