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03 Foreman 450.New head,Bored with new piston and pin,New timing chain,New centrifugal weights .Oil pum was removed and checked according to Honda's manual .After reassembly I still have a noise and it sounds like it is in the top of the engine.It also sounds off pretty good at startup until I hit the trhottle and it calms down but never completely stops.While riding the noise is present and seems to somewhat increase and decrease depending on the load and if you coast or accelerate.I am up against a wall here and need some advice on what might be causing the noise.Any help would be appreciated.