Auger question Backfires /cuts out

[tunrevir]

I have a 3 hp jiffy legend and it idles fine but cuts out/backfires when at full throttle. I have tried adjusting the high speed setting without much luck. Could this also be a needle and seat problem? New plug?

Tunrevir~

[Surface Tension]

If you can't get it tuned with the high speed setting then the carb needs a cleaning and kit.

[BIG DS]

Get a new carb kit and also replace the hose from the primer bulb to the carb