dpehrson

Here is my experience with the same issue. Make sure it is seating in the correct seat and not just going snug... I had a similar problem with a 78 dt125 that I pulled from a scrap yard for $40. The engine would not idle after warm-up without the choke on. The problem... Apparantly someone before me placed a dab of thread locker on the air screw threads... I cleaned the carb about three times due to this problem, After a very careful and timely examination, I discovered that the airscrew was going very snug, which I had previously thought was seated, way to soon. I observed that the needle portion of the airscrew was not observed as even entering the air port orifice on the intake side of the carb. I examined the air screw threads of the carb and noticed debris gumming up the threads. I then continued to force thread past the thread locker and adventually to the real metal seat. At 01:00AM, I assembled and installed the carb and started her up. I warmed it up with the choke on and then pushed the choke in to discover that it purred like a kitten. One final adjustment to the air screw of 1/4 turn in and it idles clean without the choke and accelerates without hesitation. Who would have guessed...

dpehrson I had a similar problem with a 78 dt125 that I pulled from a scrap yard for $40. The engine would not idle after warm-up without the choke on. The problem... Apparantly someone before me placed a dab of thread locker on the air screw threads... I cleaned the carb about three times due to this problem, After a very careful and timely examination, I discovered that the airscrew was going very snug, which I had previously thought was seated, way to soon. I observed that the needle portion of the airscrew was not observed as even entering the air port orifice on the intake side of the carb. I examined the air screw threads of the carb and noticed debris gumming up the threads. I then continued to force thread past the thread locker and adventually to the real metal seat. At 01:00AM, I assembled and installed the carb and started her up. I warmed it up with the choke on and then pushed the choke in to discover that it purred like a kitten. One final adjustment to the air screw of 1/4 turn in and it idles clean without the choke and accelerates without hesitation. Who would have guessed...

dpehrson I had a similar problem with a 78 dt125 that I pulled from a scrap yard for $40. The engine would not idle after warm-up without the choke on. The problem... Apparantly someone before me placed a dab of thread locker on the air screw threads... I cleaned the carb about three times due to this problem, After a very careful and timely examination, I discovered that the airscrew was going very snug, which I had previously thought was seated, way to soon. I observed that the needle portion of the airscrew was not observed as even entering the air port orifice on the intake side of the carb. I examined the air screw threads of the carb and noticed debris gumming up the threads. I then continued to force thread past the thread locker and adventually to the real metal seat. At 01:00AM, I assembled and installed the carb and started her up. I warmed it up with the choke on and then pushed the choke in to discover that it purred like a kitten. One final adjustment to the air screw of 1/4 turn in and it idles clean without the choke and accelerates without hesitation. Who would have guessed...