MOTORHEAD
Husqvarna
Pro Class
Cleaned up my TC250 and installed a complete Leo Vince system, along with an "8" series plug. It started right up with two primer twists of the throttle and the choke on. Warmed it up for a bit, turned the choke off and it died. 
Choked it again and it fired right up. Hmm, let it warm with the choke a little longer, shut it off and it died again. Won't start or run unless the choke is on.
Seems to run fine with the choke on, but if I turn the throttle up to the point where it will stay running with the choke off, it stars this wild lean popping.
Plugged pilot jet? Pipe and plug change need a bigger pilot jet?

Choked it again and it fired right up. Hmm, let it warm with the choke a little longer, shut it off and it died again. Won't start or run unless the choke is on.
Seems to run fine with the choke on, but if I turn the throttle up to the point where it will stay running with the choke off, it stars this wild lean popping.
Plugged pilot jet? Pipe and plug change need a bigger pilot jet?