A bloke dropped of his Honda GX25 brush cutter because it won't start. Around Christmas I fitted a new carby to it and it worked fine.When I changed the carby I also put new fuel lines and filter on it. It primes fine. Now the only way I can get it to fire up for a second is with starter fluid and wide open throttle. It is obviously a carby issue, just not sure what to look for, anybody have any ideas?