My dirt bike bogs down in mid and full throttle with the choke open . I cleaned the jets and changed the air filter.only thing I didn't do was adjust the jet pin

. Clean any carbon build-up around the exhaust port, after removing the muffler.

. Start using Amsoil Dominator 2-Cycle Oil, mixed 50:1. It will run cleaner, produce much more power, and plugs won't foul as much.

. Install a new spark plug.