i have an 038 mag just did her up, new piston seals lines, filter, carb kit. (Bing) was running like a banshee for 2-3 days then today I went to run it and it cuts at at high speed, irregular throttle. Checked coil, plenty of fire replaced anyway, problem still persists? I’ve pulled the carb and blew it out, new fuel. Inspected fuel line everything seems okay. Blew out HS jet, and every orriface in the carb I could find...SOS. Isles and starts fine.