Hey, new to this 1/5 and have a dune runner that I pick up used, has everything stock no mods what's so ever. First couple of gas tanks ( which I have been mixing my gas 25ml oil to 1 litre of gas 25% mix ) ran great. Sluggish lower end bur good mid and high end. Now it just bogs and won't drive and takes everything to move just move a little. I have tried resetting both lower and high end needles to factory setting and still nothing, tried replacing the park plug to NGK and still nothing, took carb off and completely took apart and cleaned it with air filter as well and it still won't drive at all. It have good idle but as soon as I give some throttle it just bogs and works really hard to try to move forward. What else I'm i missing ? Stock muffler ? Would it be plug up ? Coil not firing right ? I thought a coil either work or it didn't ? Lost here anyone have any ideas ? Thanks