{"product_id":"yamaha-06-09-yz450f-09-11-yfz450r-duncan-racing-480-big-bore-cylinder-head-cams","title":"YAMAHA 06-09 YZ450F 09-11 YFZ450R DUNCAN RACING 480 BIG BORE CYLINDER HEAD CAMS","description":"\u003cp\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e Used\u003c\/p\u003e\u003cp\u003eThis 480cc (98mm) big bore top end is in very good condition and shows normal signs of wear. Removed from a very strong running engine with no issues. Duncan Racing 289-X12 high performance camshafts, cylinder head is ported with shortened bronze guides and KPMI valves, springs and hardware. Cylinder Works 98mm cylinder and Vertex piston in great condition with minimal wear. Cylinder has no scoring or issues. All valve clearances are in spec and valves seal without issue. Intake valve shims are 1.40mm, 1.50mm, and 1.65mm. Exhaust shims are 1.40mm and 1.50mm.  No scoring or excessive wear in cam journals and camshafts rotate smoothly. The only minor issue found is the exhaust valve bucket bores have been cleaned up and buckets have a small amount of play, there was no issues while running, but worth noting. Overall this kit is in excellent running shape and is very powerful and fast. Removed from an AMA flat track bike. Ready to install and run!\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e Yamaha\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 2S2-11102-00-00,2S2-11311-00-00,2S2-11311-11-00\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eType:\u003c\/strong\u003e cylinder head \u0026amp; Valves\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eVehicle Compatibility\u003c\/strong\u003e\u003c\/p\u003e\u003ctable cellpadding=\"4\" 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