I have a 2012 rmz 450 with 110 hours on it. Fresh rebuild 7 hours ago top and bottom. Went Cp carillio rod and high comp piston and new oem valves. Any way I have just repacked my oem exhaust with lexx exhaust packing, oem mesh. I did cut the 25mm cone off the end of the factory insert. It seems like its running very lean now. I'm using the rich coupler. The muffler is getting really hot, and makes a tink tink noise when you turn the bike off. What have I done?