I picked up a 06 rmz450 and he told me he tried to do the carb rebuild kit on it and tested it and didn’t get it running so posted for sell. when I got the bike it had spark but low coolant so i just did coolant, oil and oil filter change and new spark plug. took carb off and heard sun shaking inside and opened it and found 2 screws in the float bowl not even in place. put them in place, didn’t have carb cleaner atm so just sprayed with compressed air, cleaned jets, put it back together hoping that was fix but only got to get it running with choke. turning on wasn’t a big struggle but it would shut off when i turn choke off, would also backfire and pop a lot when revving it. so took off carb again with carb cleaner this time cleaned all jets again, the circuits and all passages, put the carb back on and now it doesn’t start at all. was hoping this bike would be a quick fix and ready to rip, but now i don’t know what to do. any reply would be appreciated.