I'd say you need to have yours done. They loosen up over time and you'll start to hear a tick and your vavles will not open enough. I just did mine on my 2000 450 a few weeks ago for the 1st time and was amazed by how easy it was to do and how loose mine had gotten. Look at it this way, it can't hurt.
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2000 Honda Foreman 450ES- HMF Utility Series Exhaust - High Lifter Disc Brake Conversion - Progressive 512 Series Suspension - ITP Mud Lite XL 26x12x12 - 26x10x12 - Summit Winch
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