I have an "03" 400ex. My stock engine ran fine just had a little valve tapping. I then blew the piston to pieces. I got all the pieces out of the motor block. So I just put in the Wesco 440kit. Now its making a funny noise when i give it gas, its like a chirping noise. It is also extremely hard to start. I just put new jets in today. My friends and I can't figure out what is wrong. Please help.