So I just went to Harley and got a gasket replacement kit. I replace the head gaskets and rocker top gaskets on my 883 Screaming Eagle 98 sporty. Once I got everything back together, I turned the ignition on and she craked up. But I did notice a knocking sound. Is this due to the fact that there may not be enough oil collected back inside the heads yet? Will this go away. I havent been able to let the bike run for an extended amount of time yet because I have a busted exhaust header bolt and need to get that fixed first. But in the 20 to 30 seconds that i did let her purr she knocked. Thanks for any information you can supply.