Just replaced the top end on my blaster. The kit came with a new carb so I used that one but reused the needle/spring ect from the other carb. I got it to fire up and run. The issue I'm having is that it won't stay running when I let go of throttle and I tried to coast it in first after it was running awhile and it boggs down and dies. Do I need to adjust the new carb? Any suggestions?