Exhaust valves

I know people who have used them, and they seem OK, but you will need to use springs made for them since they are quite a bit heavier.

I got my Valves here http://www.hondaeasttoledo.com, cheapest I was able to find. Your looking at $54 per OEM valve through them. I found them through another guy on the forum and was happy when I did, just passing a good resource.

when do i really need to service valves i got 200+ hours on my bike fresh oil 90% of the time especially weekends fires first kick iridium plug serviced carburetor new filters and all so do i even need to think twice before doing something terribly wrong to my bike and fyi i found a full valve kit on ebay top rated seller http://cgi.ebay.com/ebaymotors/Yamaha-OEM-Full-Valve-Kit-2003-2009-YZ450F-YZ-450F-_W0QQcmdZViewItemQQhashZitem35b0550e3fQQitemZ230591630911QQptZMotorcyclesQ5fPartsQ5fAccessories#ht_2064wt_1365

when do i really need to service valves i got 200+ hours on my bike fresh oil 90% of the time especially weekends fires first kick iridium plug serviced carburetor new filters and all so do i even need to think twice before doing something terribly wrong to my bike and fyi i found a full valve kit on ebay top rated seller http://cgi.ebay.com/ebaymotors/Yamaha-OEM-Full-Valve-Kit-2003-2009-YZ450F-YZ-450F-_W0QQcmdZViewItemQQhashZitem35b0550e3fQQitemZ230591630911QQptZMotorcyclesQ5fPartsQ5fAccessories#ht_2064wt_1365

The second time that you have to shim them, they should be replaced and a full valve job performed (valves, springs, guides, seats, any worn parts, and shop machining). That can happen at 20 hours or hundreds of hours. Keep the air clean, the revs reasonable, and they should last a long time.

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